\n
\u8868\u7ed3\u6784[\u6ce82]<\/sub><\/h4>\nclassDiagram\ndirection BT\nclass comments {\n varchar commentable_type\n integer commentable_id\n text body\n datetime created_at\n datetime updated_at\n integer id\n}\nclass posts {\n varchar title\n text content\n datetime created_at\n datetime updated_at\n integer id\n}\nclass videos {\n varchar title\n varchar url\n datetime created_at\n datetime updated_at\n integer id\n}\n<\/code><\/pre>\n\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u6211\u4eec\u5b58\u5728\u4e09\u5f20\u8868\uff0c\u5176\u4e2d\uff0ccomments \u4f7f\u7528 commentable_id \u5206\u522b\u4e0e posts \u548c videos \u5173\u8054\uff0c\u81f3\u4e8e\u5177\u4f53\u9700\u8981\u5173\u8054\u54ea\u4e00\u4e2a\u6a21\u578b\uff0c\u5219\u9700\u8981\u6839\u636e commentable_type \u6765\u51b3\u5b9a\u3002<\/p>\n
\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cLaravel \u5728 commentable_type \u4e2d\u586b\u5145\u7684\u662f Post \u548c Video \u6a21\u578b\u7684\u5b8c\u6574\u547d\u540d\u7a7a\u95f4\u7c7b\u540d\u3002\u4e5f\u5c31\u662f\u5206\u522b\u4e3a\uff1aApp\/Models\/Post<\/code> \u548c App\/Models\/Video<\/code>\uff0c\u8fd9\u4e2a\u8bbe\u8ba1\u5e26\u6765\u4e86\u4e00\u4e9b\u5c0f\u95ee\u9898\u3002<\/p>\n\n- \u6211\u4eec\u7684 type \u5b57\u6bb5\u548c\u5b9e\u4f53\u7c7b\u540d\u5f3a\u5173\u8054\u4e86\uff0c\u5982\u679c\u5c06\u6765\u7c7b\u53ef\u80fd\u8981\u6539\u540d\u5b57\uff0c\u5c31\u52bf\u5fc5\u8981\u4fee\u6539\u6570\u636e\u5e93\u5185\u7684\u6570\u636e\u624d\u884c\u3002<\/li>\n
- \u8fd9\u91cc\u9762\u5305\u542b\u4e86
\/<\/code> \u8fd9\u4e2a \u201c\u9ebb\u70e6\u201d\u7684\u5b57\u7b26\uff0c\u6709\u4e9b SQL \u5de5\u5177\u4f60\u8fd8\u9700\u8981\u591a\u6b21\u8f6c\u4e49\u540e\u624d\u80fd\u6784\u6210\u6700\u7ec8\u7684\u67e5\u8be2\uff0c\u5c24\u5176\u662f\u6709\u4e9b\u7279\u522b\u7684\u67e5\u8be2\u3002<\/li>\n- \u8fd9\u91cc\u5b8c\u6574\u7684\u7c7b\u540d\u592a\u8fc7\u4e8e\u5197\u957f\uff0c\u4ed6\u4eec\u51e0\u4e4e\u90fd\u6709\u4e00\u6837\u7684\u524d\u7f00\uff0c\u53ea\u662f\u540e\u9762\u7684\u7c7b\u540d\u4e0d\u4e00\u6837\u800c\u5df2\u3002<\/li>\n<\/ul>\n
\u57fa\u4e8e\u4ee5\u4e0a\u7684\u95ee\u9898\uff0cLaravel \u5b98\u65b9\u4e5f\u63d0\u4f9b\u4e86\u89e3\u51b3\u65b9\u6848\uff0c\u5c31\u662f\u4f7f\u7528 Relation::morphMap<\/code> \u65b9\u6cd5\uff0c\u5b83\u7528\u8d77\u6765\u5c31\u50cf\u4e0b\u9762\u8fd9\u6837\u3002<\/p>\npublic function boot(){\n Relation::morphMap([\n 'post' => 'App\/Models\/Post',\n 'video' => 'App\/Models\/Video',\n ]);\n}<\/code><\/pre>\n\u7b49\u7b49\uff0c\u4e0d\u5bf9\u554a\uff0c\u6211\u770b\u6587\u6863\u4e2d\u660e\u660e\u662f Relation::enforceMorphMap<\/code>\uff0c\u4f60\u600e\u4e48\u8bf4\u662f morphMap<\/code>\uff0c\u5176\u5b9e\u90fd\u6ca1\u9519\uff0c\u867d\u7136\u4f60\u73b0\u5728\u770b\u5230\u6700\u65b0\u7684 Laravel \u6587\u6863\u4e2d\u63d0\u5230\u7684\u662f Relation::enforceMorphMap<\/code> \uff0c\u4f46\u662f\u5b9e\u9645\u4e0a\uff0cmorphMap<\/code> \u4e5f\u662f\u53ef\u4ee5\u7528\u7684\uff0c\u56e0\u4e3a\u8fd9\u662f\u4e4b\u524d\u9057\u7559\u4e0b\u7684\u65b9\u6cd5\uff0c\u90a3\u65e2\u7136\u6709 morphMap<\/code> \u4e86\uff0c\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981 enforceMorphMap<\/code>\uff1f<\/p>\n\u95ee\u5f97\u597d\uff0c\u5728\u4f7f\u7528 morphMap<\/code> \u6211\u4eec\u53ef\u4ee5\u9009\u62e9\u4e3a\u90e8\u5206\u7684 morph \u8bbe\u7f6e\u6620\u5c04\uff0c\u6bd4\u5982\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u53ef\u4ee5\u53ea\u6620\u5c04 post\u3001\u800c\u4e0d\u6620\u5c04 video\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u6570\u636e\u5e93\u4e2d\uff0cpost \u7684 type \u4fdd\u5b58\u7684\u662f post\u3001\u800c video \u5374\u4fdd\u5b58\u7684 App\/Models\/Video<\/code>\uff0c\u9020\u6210\u4e86\u4e00\u79cd\u4e0d\u4e00\u81f4\u4e86\u3002\u5c24\u5176\u662f\u8fd9\u91cc\u7684 \u201c\u591a\u6001\u201d\uff0c\u5c31\u610f\u5473\u7740\uff0c\u4e00\u5f00\u59cb\u53ef\u80fd\u53ea\u6709\u8fd9\u4e24\u4e2a\u7c7b\u578b\uff0c\u7ed3\u679c\u540e\u9762\u53c8\u65b0\u589e\u4e00\u4e2a\u7c7b\u578b\uff0c\u524d\u9762\u7684\u4f60\u90fd\u6620\u5c04\u4e86\uff0c\u800c\u540e\u9762\u7684\u540c\u4e8b\u5fd8\u4e86\u6620\u5c04\uff0c\u5c31\u5bfc\u81f4\u6570\u636e\u5e93\u91cc\u9762\u7684\u6570\u636e\u770b\u8d77\u6765\u4e71\u7cdf\u7cdf\u7684\u4e86\u3002<\/p>\n\u6240\u4ee5\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u81ea Laravel 8.x \u5f00\u59cb\uff0c\u5f15\u5165\u4e86 enforceMorphMap<\/a> \u8fd9\u4e2a Feature\uff0c\u5e76\u4e14\u6587\u6863\u91cc\u9762\u4e5f\u6539\u4e3a\u4e86\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u73b0\u5728\u5982\u679c\u4f60\u4f7f\u7528\u4e86\u8fd9\u4e2a\uff0c\u6a21\u578b\u5374\u5fd8\u4e86\u6620\u5c04\uff0c\u5c31\u4f1a\u629b\u51fa\u4e00\u4e2a ClassMorphViolationException<\/code> \u5f02\u5e38\uff0c\u800c\u4e0d\u662f\u50cf\u4e4b\u524d\u90a3\u6837\u9ed8\u4e0d\u4f5c\u58f0\uff0c\u4ece\u800c\u5e2e\u52a9\u4f60\u5728\u5f00\u53d1\u9636\u6bb5\u53d1\u73b0\u8fd9\u4e2a\u95ee\u9898\uff0c\u5b83\u5185\u90e8\u5176\u5b9e\u662f\u8c03\u7528\u4e86 requireMorphMap<\/code> + morphMap<\/code> \u800c\u5df2\uff0c\u5f53\u7136\uff0c\u5982\u679c\u4f60\u559c\u6b22\u4e4b\u524d\u90a3\u6837\uff0c\u8fd8\u662f\u53ef\u4ee5\u8c03\u7528\u65e7\u7684 morphMap<\/code> \u65b9\u6cd5 \u3002<\/p>\n\u9047\u5230\u7684\u95ee\u9898<\/h3>\n
\u5b9e\u9645\u4e0a\uff0c\u4e0a\u9762\u90fd\u662f\u7406\u60f3\u5b8c\u7f8e\u72b6\u6001\uff0c\u6709\u4e00\u4e9b\u7279\u522b\u7684\u9650\u5236\u3002<\/p>\n
\n- \u5b9a\u4e49\u7684\u522b\u540d\u5fc5\u987b\u662f\u5168\u5c40\u552f\u4e00\u7684\u3002<\/li>\n
- \u4f7f\u7528\u6570\u5b57\u4f5c\u4e3a\u522b\u540d\u65f6\uff0c\u88ab\u610f\u5916\u7684\u91cd\u7f6e\uff08Laravel < 5.5\uff09<\/li>\n<\/ul>\n
\u6709\u65f6\u5019\u6211\u4eec\u7684\u4e1a\u52a1\u4e2d\u5c31\u662f\u4f7f\u7528\u4e86\u6570\u5b57\u6765\u533a\u5206\u4e0d\u540c\u7684 type\uff0c\u5e76\u4e14\u4e0d\u540c\u6a21\u578b\u7684 type \u53ef\u80fd\u8fd8\u4f1a\u91cd\u590d\uff0c\u6bd4\u5982\u6211\u4eec\u5e0c\u671b\u5728 Comment \u4e2d\uff0ctype 1\/2 \u5206\u522b\u8868\u793a Post \u548c Video\uff0c\u800c\u5728 Attachment \u4e2d\uff0ctype 1\/2 \u53c8\u5206\u522b\u8868\u793a User \u548c Product\u3002<\/p>\n
\u901a\u5e38\u6211\u4eec\u76f4\u63a5\u8fd9\u6837\u505a\u7684\u8bdd\uff0c\u90fd\u4f1a\u5f97\u5230\u4e00\u4e2a\u9519\u8bef\uff1aClass name must be a valid object or a string<\/code>\uff0c\u5b83\u6765\u81ea\u4e8e PHP\uff0c\u56e0\u4e3a PHP \u5728\u5c1d\u8bd5 new \u8fd9\u4e2a\u7c7b\u7684\u65f6\u5019\uff0c\u65e0\u6cd5\u89e3\u6790\u4e86\u3002<\/p>\n\u8fd9\u4e2a\u9700\u6c42\u5f88\u201c\u5e38\u89c1\u201d\u662f\u5427\uff0c\u4f46\u662f\u76ee\u524d\u5374\u505a\u4e0d\u5230\u3002<\/p>\n
\u5728\u65e9\u671f\u7684\u7248\u672c\u4e2d\uff0c\u5176\u5b9e\u8fd8\u5b58\u5728\u53e6\u5916\u4e00\u4e2a\u7531 morphMap<\/code> \u5e26\u6765\u7684\u95ee\u9898<\/p>\n public static function morphMap(array $map = null, $merge = true)\n {\n $map = static::buildMorphMapFromModels($map);\n\n if (is_array($map)) {\n static::$morphMap = $merge && static::$morphMap\n ? array_merge(static::$morphMap, $map) : $map;\n }\n\n return static::$morphMap;\n }\n<\/code><\/pre>\n\u5982\u4e0a\u7684\u4ee3\u7801\u4e2d\uff0c\u5982\u679c\u6211\u4eec\u4f20\u5165\u7684\u6620\u5c04\u952e\u662f\u6570\u5b57\u7684\uff0c\u4ee3\u7801\u8fdb\u5165 array_merge \u7684\u5206\u652f\u65f6\uff0c\u5c31\u4f1a\u56e0\u4e3a array_merge \u5bfc\u81f4\u7d22\u5f15\u88ab\u91cd\u7f6e\u2026\u2026<\/p>\n
\n- Illuminate\/Database\/Eloquent\/Relations\/Relation::morphMap should allow numeric types \u00b7 Issue #12845 \u00b7 laravel\/framework<\/a><\/li>\n<\/ul>\n
\u5728\u4e0a\u9762\u7684\u8fd9\u4e2a\u8ba8\u8bba\u4e2d\uff0c\u8fd8\u63d0\u5230\u4e86\u53e6\u5916\u4e00\u4e2a\u95ee\u9898\uff0c\u5c31\u662f\u80fd\u5426\u4ee5\u7ec4\u7684\u65b9\u5f0f\uff0c\u4e3a\u6bcf\u4e2a\u90fd\u5b9a\u4e49\u6620\u5c04\uff0c\u4e0d\u8fc7\u8fd9\u4e2a\u95ee\u9898\u7684\u8ba8\u8bba\u5e76\u6ca1\u6709\u7ed3\u679c\uff0c\u4f46\u662f\u7c7b\u4f3c\u7684\u671f\u5f85\u8fd8\u662f\u633a\u591a\u7684\uff0c\u751a\u81f3\u8fd8\u51fa\u73b0\u4e86\u4e00\u4e9b\u504f\u95e8\u7684\u3002<\/p>\n
\n- \/[8.x] Option to use table names when morphing by taylorotwell \u00b7 Pull Request #38451 \u00b7 laravel\/framework<\/a><\/li>\n<\/ul>\n
\u8fd9\u4e2a PR \u4e2d\uff0c\u6dfb\u52a0\u4e86\u4e00\u4e2a Relation::morphUsingTableNames()<\/code> \u65b9\u6cd5\uff0c\u7528\u4e8e\u81ea\u52a8\u6620\u5c04\u8868\u540d\uff0c\u4f46\u662f\u56e0\u4e3a\u4e00\u4e9b\u590d\u6742\u7684\u539f\u56e0\uff0c\u8fd9\u4e2a PR \u6700\u540e\u8fd8\u662f\u88ab Revert \u4e86\uff0c\u56e0\u4e3a\u5b83\u8fd8\u5b58\u5728\u4e00\u4e9b\u5176\u4ed6\u4e0d\u80fd\u88ab\u4fee\u590d\u7684[\u95ee\u9898https:\/\/github.com\/laravel\/framework\/issues\/35519<\/a>]()\u3002<\/p>\n![\"image.png\"](\"https:\/\/segmentfault.com\/img\/bVdfbpM\" "\\"image.png\\"")
<\/p>\n
\u5176\u5b9e\u5728\u8fd9\u4e2a PR \u4e2d\uff0c\u8fd8\u6709\u53e6\u5916\u4e00\u4e2a\u58f0\u97f3<\/a>\uff1a<\/p>\n![\"image.png\"](\"https:\/\/segmentfault.com\/img\/bVdfbpN\" "\\"image.png\\"")
<\/p>\n
\nimliam<\/a><\/strong> on Aug 20, 2021<\/a><\/h4>\nWhile this code is being changed, maybe it would also be useful to add an optional property\/method to models (eg. morphableName<\/code>) that can be used – so each model can represent its own morphable name itself instead of being done elsewhere in a map?<\/p>\n<\/blockquote>\n\u5bfb\u627e\u89e3\u836f<\/h3>\n
\u4e0d\u8fc7\u503c\u5f97\u4e00\u63d0\u7684\u662f Laravel \u4e2d\u786e\u5b9e\u6709\u4e00\u4e2a\u5b58\u5728\u7c7b\u4f3c\u80fd\u529b\u7684\u65b9\u6cd5\uff0c\u90a3\u5c31\u662f HasRelationships::getActualClassNameForMorph<\/code>\uff0c\u76ee\u524d\uff0c\u4ed6\u4f1a\u5728\u4f60\u4f7f\u7528\u5355\u4e2a\u6a21\u578b<\/strong>\u8bbf\u95ee\u5c1a\u672a\u52a0\u8f7d\u7684\u591a\u6001\u6a21\u578b\u65f6\u88ab\u8c03\u7528\uff0c\u4f1a\u4f20\u5165 type \u7684\u503c\u4f5c\u4e3a\u53c2\u6570\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u6570\u636e\u5e93\u4e2d\u4fdd\u5b58\u7684\u662f 1 \uff0c\u8fd9\u91cc\u5c31\u4f1a\u4f20\u5165 1\u3002<\/p>\n\u8fd9\u4e2a\u65b9\u6cd5\u7684\u9ed8\u8ba4\u5b9e\u73b0\u5982\u4e0b\uff1a<\/p>\n
public static function getActualClassNameForMorph($class)\n {\n return Arr::get(Relation::morphMap() ?: [], $class, $class);\n }\n<\/code><\/pre>\n\u53ef\u4ee5\u770b\u5230\uff0c\u8fd9\u91cc\u5b9e\u9645\u4e0a\u5c31\u662f\u8c03\u7528\u4e86\u524d\u9762\u5b9a\u4e49\u7684\u6620\u5c04\u800c\u5df2\uff0c\u73b0\u5728\u6211\u4eec\u5230 Comment \u6dfb\u52a0\u8fd9\u4e2a\u65b9\u6cd5\u7684\u590d\u5199\uff1a<\/p>\n
public static function getActualClassNameForMorph($class)\n {\n return match ((int) $class) {\n 1 => Post::class,\n 2 => Video::class,\n default => parent::getActualClassNameForMorph($class),\n };\n }\n<\/code><\/pre>\n\u7136\u540e\u4f60\u5c31\u4f1a\u53d1\u73b0\u4e00\u4e2a\uff0c\u597d\u50cf\u786e\u5b9e\u53ef\u4ee5\u3002\u5f53\u4f60\u6267\u884c\u7f16\u5199\u4e0b\u9762\u7684\u4ee3\u7801\u65f6\uff0c\u4f60\u786e\u5b9e\u62ff\u5230\u4e86\u5bf9\u5e94\u7684 commentable<\/p>\n
dump(\/App\/Models\/Comment::first()->commentable);<\/code><\/pre>\n\u770b\u8d77\u6765\u5f88\u7f8e\u597d\uff0c\u4f60\u5e94\u66f4\u5f88\u5feb\u5c31\u4f1a\u53d1\u73b0\uff0c\u8fd9\u5b9e\u9645\u4e0a\u5e26\u6765\u4e86\u53e6\u5916\u4e00\u4e2a\u95ee\u9898\uff0c\u4f60\u6ca1\u6cd5\u4f7f\u7528 with \u548c load \u8fdb\u884c\u9884\u52a0\u8f7d\u5173\u7cfb\u4e86<\/strong>\u3002<\/p>\n\u5f53\u4f60\u4f7f\u7528 with \u6216\u8005 load \u65f6\uff0c\u4f60\u5c06\u4f1a\u5f97\u5230\u4e00\u4e2a\u8ddf\u6ca1\u6709\u4f7f\u7528\u8fd9\u4e2a\u65b9\u6cd5\u65f6\u4e00\u6837\u7684\u9519\u8bef\uff1aClass name must be a valid object or a string<\/code>\uff0c\u662f\u7684\uff0c\u6ca1\u9519\uff0c\u4ed6\u5c31\u662f\u771f\u7684\u6ca1\u6709\u4f7f\u7528\u8fd9\u4e2a\u65b9\u6cd5\u2026\u2026\uff0c\u60f3\u4e0d\u5230\u5427\u3002<\/p>\n\u8fd9\u5176\u5b9e\u662f Laravel \u7ed9\u6211\u4eec\u5f00\u7684\u4e00\u4e2a\u201c\u5c0f\u73a9\u7b11\u201d\uff0c\u5f53\u6211\u4eec\u4ece\u4e00\u4e2a\u5c1a\u672a\u9884\u52a0\u8f7d commentable \u7684\u6a21\u578b\u65f6\uff0c\u5982\u679c\u8bbf\u95ee commentable\uff0c\u90a3\u4e48 Laravel \u6309\u7167\u4ee5\u4e0b\u8def\u5f84\u6765\u8bbf\u95ee\u5230\u6211\u4eec\u521a\u521a\u8986\u76d6\u7684 getActualClassNameForMorph<\/code> \u65b9\u6cd5\u3002<\/p>\ngraph TD\n A[HasRelationships.morphInstanceTo]\n B[HasRelationships.morphTo]\n C[Comment.commentable]\n\n B --> A\n C --> B<\/code><\/pre>\nLaravel \u5148\u8c03\u7528\u4e86\u6211\u4eec\u7684\u5173\u7cfb\u65b9\u6cd5 commentable\uff0c\u7136\u540e\u5173\u7cfb\u91cc\u9762\u8c03\u7528\u4e86 morphTo\uff0c\u63a5\u7740\u53c8\u8c03\u7528\u4e86 morphInstanceTo\uff0c\u7136\u540e\u5728 morphInstanceTo \u8c03\u7528\u4e86\u6211\u4eec\u521a\u521a\u521b\u5efa\u7684\u65b9\u6cd5\u3002<\/p>\n
protected function morphInstanceTo($target, $name, $type, $id, $ownerKey)\n {\n $instance = $this->newRelatedInstance(\n static::getActualClassNameForMorph($target)\n );\n\n return $this->newMorphTo(\n $instance->newQuery(), $this, $id, $ownerKey ?? $instance->getKeyName(), $type, $name\n );\n }<\/code><\/pre>\n\u6ce8\u610f\uff0c\u8fd9\u91cc\u4e4b\u6240\u4ee5\u80fd\u591f\u8bbf\u95ee\u5230\u6211\u4eec\u5b9a\u4e49\u7684 getActualClassNameForMorph<\/code> \u65b9\u6cd5\uff0c\u6b63\u662f\u56e0\u4e3a\u8fd9\u91cc\u4f7f\u7528\u4e86 statis<\/code> \u8fdb\u884c\u8c03\u7528\uff08\u5ef6\u8fdf\u7ed1\u5b9a<\/a>\uff09<\/p>\n\u73b0\u5728\uff0c\u518d\u6765\u770b\u770b getActualClassNameForMorph<\/code> \u7684\u53e6\u4e00\u6761\u8bbf\u95ee\u8def\u5f84<\/p>\ngraph TD\n E[MorphTo.createModelByType]\n F[MorphTo.getResultsByType]\n G[MorphTo.getEager]\n H[Builder.eagerLoadRelation]\n I[Builder.eagerLoadRelations]\n J[Model.load]\n K[Builder.get]\n L[HasOneOrManyThrough.get]\n M[BelongsToMany.get]\n\n F --> E\n G --> F\n H --> G\n I --> H\n J --> I\n K --> I\n L --> I\n M --> I<\/code><\/pre>\n\u53ef\u4ee5\u770b\u5230\uff0c\u5e38\u7528\u7684 Builder.get \u548c Model.load \u90fd\u6700\u7ec8\u4f1a\u8bbf\u95ee\u5230 MorphTo.createModelByType<\/code>\u6700\u7ec8\u5728\u8fd9\u4e2a\u65b9\u6cd5\u91cc\u9762\u8c03\u7528\u4e86 getActualClassNameForMorph<\/code><\/p>\n public function createModelByType($type)\n {\n $class = Model::getActualClassNameForMorph($type);\n\n return tap(new $class, function ($instance) {\n if (! $instance->getConnectionName()) {\n $instance->setConnection($this->getConnection()->getName());\n }\n });\n }<\/code><\/pre>\n\u800c\u8fd9\u91cc\u5374\u4f7f\u7528\u4e86 Model \u8fdb\u884c\u8c03\u7528\uff0c\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f<\/p>\n
\u73b0\u5728\u6765\u4f1a\u770b\u4e00\u4e0b\u5b8c\u6574\u7684\u8c03\u7528\u8def\u5f84<\/p>\n
graph TD\n N[HasRelationships.getActualClassNameForMorph]\n A[HasRelationships.morphInstanceTo]\n B[HasRelationships.morphTo]\n C[Comment.commentable]\n E[MorphTo.createModelByType]\n F[MorphTo.getResultsByType]\n G[MorphTo.getEager]\n H[Builder.eagerLoadRelation]\n I[Builder.eagerLoadRelations]\n J[Builder.get]\n K[BelongsToMany.get]\n L[Model.load]\n M[HasOneOrManyThrough.get]\n\n A --> N\n B --> A\n C --> B\n E --> N\n F --> E\n G --> F\n H --> G\n I --> H\n J --> I\n K --> I\n L --> I\n M --> I<\/code><\/pre>\n\u53ef\u4ee5\u770b\u5230\uff0c\u5f53\u6211\u4eec\u76f4\u63a5\u8bbf\u95ee commentable \u7684\u65f6\u5019\uff0c\u5b9e\u9645\u4e0a\u662f\u8d70\u4e86\u5de6\u8fb9\u7684\u8def\u5f84\uff0c\u800c\u5f53\u6211\u4eec\u4f7f\u7528 with\/load \u65f6\u8d70\u7684\u662f\u53f3\u8fb9\u7684\u8def\u5f84\u3002<\/p>\n
\u6b64\u65f6\u6700\u5927\u7684\u533a\u522b\u5c31\u5728\u4e8e\uff0cHasRelationships<\/code> \u672c\u8eab\u662f\u4e00\u4e2a Trait\uff0c\u5b83\u5728\u57fa\u7840 Model \u4e2d\u88ab use\uff0c\u90a3\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u4e0a\u9762\u8c03\u7528 HasRelationships.morphInstanceTo<\/code> \u7684\u65f6\u5019 static<\/code> \u5b9e\u9645\u4e0a\u8fd8\u662f\u6211\u4eec\u8c03\u7528\u7684 Model\uff08Comment\uff09\uff0c\u800c MorphTo \u5462\uff1f\u5b83\u662f\u4e00\u4e2a\u5355\u72ec\u7684\u7c7b\uff0c\u6240\u4ee5\u8fd9\u91cc\u662f\u7528\u4e86 Model \u8fdb\u884c\u8c03\u7528\uff0c\u90a3\u6211\u8fd9\u91cc\u5c31\u8bbf\u95ee\u4e0d\u5230 Comment \u5417\uff1f\u5176\u5b9e\u4e0d\u7136\uff0c\u5728 MorphTo \u8fd9\u4e2a\u7c7b\u4e2d\uff0c\u56e0\u4e3a\u5176\u7956\u5148\u7c7b\u662f Relation\uff0c\u5176\u5b9e\u91cc\u9762\u6709\u4e00\u4e2a parent \u5c5e\u6027\uff0c\u8fd9\u4e2a\u5c5e\u6027\u4fdd\u5b58\u7684\u5c31\u662f Comment \u7684\u5b9e\u4f8b\u3002<\/p>\nclassDiagram\n Relation <|-- BelongsTo\n BelongsTo <|-- MorphTo\n\n Relation : +Model parent\n class Relation\n class BelongsTo \n class MorphTo<\/code><\/pre>\n\u4f46\u662f\uff0c\u81f3\u4e8e Laravel \u4e2d\u4e3a\u4ec0\u4e48\u4f1a\u8fd9\u6837\u505a\uff0c\u6682\u65f6\u4e0d\u592a\u6e05\u695a\uff0c\u6ca1\u6709\u627e\u5230\u76f8\u5173\u8d44\u6599\u3002<\/p>\n
\u503c\u5f97\u4e00\u63d0\u7684\u662f\uff0c\u5728 Laravel 5.4 \u4e4b\u524d\uff0c\u786e\u5b9e\u6709\u8fc7\u7c7b\u4f3c\u7684\u7528\u6cd5\uff0c\u6b64\u540e\u90fd\u88ab\u53d6\u4ee3\u4e86\u3002<\/p>\n
![\"image.png\"](\"https:\/\/segmentfault.com\/img\/bVdfbpO\" "\\"image.png\\"")
<\/p>\n
\n- Cleaning up morphTo relationship. \u00b7 laravel\/framework@3cf7f17<\/a><\/li>\n<\/ul>\n
\u5176\u5b9e\u4ece\u4e0a\u9762\u7684 PR \u4e2d\u4e0d\u96be\u770b\u5230\uff0c\u4e00\u5f00\u59cb morphInstanceTo<\/code> \u91cc\u9762\u4e5f\u662f\u4f7f\u7528\u7684 Model<\/code> \u8fdb\u884c\u8c03\u7528\u3002<\/p>\n![\"image.png\"](\"https:\/\/segmentfault.com\/img\/bVdfbpP\" "\\"image.png\\"")
<\/p>\n
\u53ea\u662f\u5728\u968f\u540e\u7684\u4e00\u4e2a PR<\/a> \u4e2d\uff0c\u6709\u4eba\u8d21\u732e\u4e86\u4e00\u6b21\uff0c\u5e76\u4e14\u628a\u8fd9\u91cc\u6539\u6210\u4e86 static<\/code> \u8c03\u7528\uff0c\u5e76\u4e14\u539f\u56e0\u4e5f\u662f\u8fd9\u4e2a\u8d21\u732e\u8005\u5e0c\u671b\u4f7f\u7528\u6570\u5b57\u6765\u4e3a\u6bcf\u4e2a\u6a21\u578b\u5b9a\u4e49\u6620\u5c04\uff0c\u8fd9\u4e2a PR \u4e5f\u662f\u88ab\u5408\u5e76\u4e86\uff0c\u4e5f\u5c31\u8fbe\u5230\u4e86\u73b0\u5728\u7684\u6837\u5b50\uff0c\u4f46\u662f\u5bf9\u4e8e createModelByType<\/code> \u91cc\u9762\u7684\u8c03\u7528\uff0c\u8fd9\u4f4d\u8d21\u732e\u8005\u4e5f\u63d0\u4ea4\u4e86 PR<\/a>\uff0c\u4f46\u662f\u8fd9\u4e2a PR \u56e0\u4e3a Travis \u7684\u6d4b\u8bd5\u5931\u8d25\u4e86\uff0c\u56e0\u4e3a\u4ed6\u8fd9\u91cc\u662f\u76f4\u63a5\u7c97\u66b4\u7684\u8c03\u7528\u4e86 static<\/code>\uff0c\u524d\u9762\u8bf4\u8fc7\uff0c\u8fd9\u91cc\u7684 static \u5b9e\u9645\u4e0a\u662f\u6307\u5411\u4e86 MorphTo\uff0c\u6240\u4ee5\u81ea\u7136\u662f\u884c\u4e0d\u901a\u7684\uff0c\u4e14\u4f5c\u8005\u6ca1\u6709\u53ca\u65f6\u7ef4\u62a4\uff0c\u88ab\u5173\u95ed\u4e86\uff0c\u81f3\u6b64\u5c31\u9057\u7559\u81f3\u4eca \ud83e\udee5<\/p>\n\n- 5.4 Allow getActualClassNameForMorph() used by createModelByType() to be overridden by masterwto \u00b7 Pull Request #18099 \u00b7 laravel\/framework<\/a><\/li>\n
- 5.4 Update HasRelations::morphInstanceTo() by masterwto \u00b7 Pull Request #18058 \u00b7 laravel\/framework<\/a><\/li>\n<\/ul>\n
\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u6253\u5f00 MorphTo::createModelByType \uff0c\u4fee\u6539 Model \u4e3a parent<\/p>\n
public function createModelByType($type)\n {\n- $class = Model::getActualClassNameForMorph($type);\n+ $class = $this->parent::getActualClassNameForMorph($type);\n\n return tap(new $class, function ($instance) {\n if (! $instance->getConnectionName()) {\n $instance->setConnection($this->getConnection()->getName());\n }\n });\n }<\/code><\/pre>\nok\uff0c\u8fd4\u56de\u6211\u4eec\u7684\u4ee3\u7801\uff0c\u4f60\u5c31\u53ef\u4ee5\u53d1\u73b0 load \u548c with \u90fd\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\u4e86\u3002<\/p>\n
\u4f46\u662f\uff0c\u8fd9\u5c31\u591f\u4e86\u5417\uff1f<\/p>\n
\u5982\u679c\u4f60\u7684\u8868\u4e2d\u53ea\u6709\u4e00\u4e2a\u8fd9\u6837\u7684\u591a\u6001\u5173\u8054\u5173\u7cfb\uff0c\u8fd9\u5c31\u591f\u4e86\uff0c\u5982\u679c\u4f60\u6709\u591a\u4e2a\uff0c\u8fd9\u53ef\u80fd\u4f1a\u4e0d\u591f\uff0c\u56e0\u4e3a\uff0cgetActualClassNameForMorph \u8fd9\u91cc\u867d\u7136\u662f\u4f20\u5165\u7684 type\uff0c\u4f46\u662f\u4ed6\u5e76\u6ca1\u6709\u544a\u8bc9\u4f60\uff0c\u8fd9\u662f\u6765\u81ea\u54ea\u4e00\u4e2a\u5b57\u6bb5\uff0c\u8fd9\u5728\u9884\u52a0\u8f7d(with\/load) \u7684\u65f6\u5019\u53d8\u5f97\u6781\u4e3a\u56f0\u96be\u3002<\/p>\n
\u5f53\u7136\uff0c\u66f4\u91cd\u8981\u7684\u662f\u76ee\u524d\u8fd9\u4e2a\u8fd8\u662f\u8981\u4f60\u53bb\u6539\u6838\u5fc3\u7684\u4ee3\u7801\u6216\u8005\u901a\u8fc7\u5176\u4ed6\u65b9\u5f0f\u6539\u6838\u5fc3\u7684\u4ee3\u7801\uff0c\u6709\u4e9b\u96be\u4ee5\u8fbe\u5230\u3002<\/p>\n
\u9677\u5165\u50f5\u5c40<\/h3>\n
\u5176\u5b9e\u5728\u51e0\u5e74\u524d\u6211\u4e5f\u5904\u7406\u8fc7\u8fd9\u4e2a\u95ee\u9898\u5f53\u7136\u662f\u8fd8\u5728\u7528 Laravel 5.4 \u7248\u672c\uff0c\u5f53\u65f6\u6839\u636e\u4e00\u901a\u8c03\u8bd5\u540e\uff0c\u786e\u5b9a\u4e86 Laravel \u5185\u90e8\u5728\u8bbf\u95ee\u5173\u8054\u5b57\u6bb5\u7684\u65f6\u5019\uff0c\u5176\u5b9e\u662f\u4f1a\u901a\u8fc7\u8bbf\u95ee\u5668\u7684 get*Attribute<\/code>\uff0c\u6240\u4ee5\u5f53\u65f6\u7684\u89e3\u51b3\u65b9\u6848\u5c31\u662f\uff0c\u521b\u5efa\u4e86\u4e00\u4e2a getCommentableTypeAttribute<\/code> \u8fd9\u6837\u7684 \u8bbf\u95ee\u5668\u3002<\/p>\n public function commentableType(): Attribute\n {\n return Attribute::get(fn($value) => match ((int) $value) {\n 1 => Post::class,\n 2 => Video::class,\n default => $value,\n });\n }\n<\/code><\/pre>\n\u597d\u50cf\u786e\u5b9e\u53ef\u4ee5\uff0cwith\/load \u90fd\u5de5\u4f5c\u4e86\u3002<\/p>\n
\u4f46\u662f\uff0c\u5f53\u6211\u4eec\u4e0d\u9002\u7528 with\/load \u65f6\uff0c\u76f4\u63a5\u8bbf\u95ee\u672a\u52a0\u8f7d\u7684\u5173\u7cfb\u5c5e\u6027\uff08commentable\uff09\u65f6\uff0c\u4f60\u5c31\u4f1a\u53d1\u73b0\uff0c\u53c8\u51fa\u9519\u4e86\uff0c\u8fd9\u6b21\u5f97\u5230\u7684\u65f6 Class "1" not found<\/code> \u8fd9\u6837\u7684\u9519\u8bef\u3002<\/p>\nWhat\uff1f<\/p>\n
\u5176\u5b9e\u554a\uff0c\u8fd9\u662f\u5728 HasRelationships::morphTo<\/code> \u8fd9\u4e2a\u65b9\u6cd5\u7684 return \u90a3\u91cc\uff0c\u6709\u4e00\u4e2a\u5224\u65ad\uff0c\u5176\u4e3b\u8981\u76ee\u7684\u662f\uff0c\u4f7f\u7528 getAttributeFromArray<\/code> \u83b7\u53d6\u6a21\u578b\u7684 $attributes<\/code> \u5c5e\u6027\uff0c\u5e76\u4e14\u8fd4\u56de\u6307\u5b9a key \u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u4ed6\u8fd9\u91cc\u5b9e\u9645\u4e0a\u65f6\u76f4\u63a5\u8bbf\u95ee\u7684 attributes \u7684\u503c\uff0c\u5e76\u4e0d\u4f1a\u7ecf\u8fc7\u4efb\u4f55\u7684\u8bbf\u95ee\u5668\u2026\u2026\uff0c\u81ea\u7136\u5c31\u6ca1\u6cd5\u4f7f\u7528\u3002<\/p>\n public function morphTo($name = null, $type = null, $id = null, $ownerKey = null)\n {\n \/\/ If no name is provided, we will use the backtrace to get the function name\n \/\/ since that is most likely the name of the polymorphic interface. We can\n \/\/ use that to get both the class and foreign key that will be utilized.\n $name = $name ?: $this->guessBelongsToRelation();\n\n [$type, $id] = $this->getMorphs(\n Str::snake($name), $type, $id\n );\n\n \/\/ If the type value is null it is probably safe to assume we're eager loading\n \/\/ the relationship. In this case we'll just pass in a dummy query where we\n \/\/ need to remove any eager loads that may already be defined on a model.\n return is_null($class = $this->getAttributeFromArray($type)) || $class === ''\n ? $this->morphEagerTo($name, $type, $id, $ownerKey)\n : $this->morphInstanceTo($class, $name, $type, $id, $ownerKey);\n }\n<\/code><\/pre>\n\u4e0d\u8fc7\uff0c\u6ce8\u610f\u540e\u9762\u7684\u5224\u65ad\uff0c\u5982\u679c attributes \u6709\u8fd9\u4e2a\u5b57\u6bb5\uff0c\u5c31\u4f1a\u8c03\u7528 morphEagerTo<\/code>\uff0c\u53cd\u4e4b\u8c03\u7528\u540e\u9762\u7684 morphInstanceTo<\/code>\uff0c\u5176\u5b9e\u8fd9\u91cc\u7684\u6ce8\u91ca\u5c31\u5199\u7684\u5f88\u660e\u767d\uff0c\u5982\u679c\u6b64\u65f6\u4ece attributes \u4e0a\u83b7\u53d6\u7684 type \u4e3a\u7a7a\uff0c\u90a3\u4e48\u5c31\u6709\u53ef\u80fd\u6211\u4eec\u5176\u5b9e\u662f\u5728\u4f7f\u7528 with(\u56e0\u4e3a\u8fd9\u65f6\u5019\u67e5\u8be2\u5e76\u6ca1\u6709\u7ed3\u675f\uff0c\u6240\u4ee5\u8fd4\u56de\u4e86 morphEagerTo<\/code>)\uff0c\u800c\u73b0\u5728\u8fd9\u91cc\u662f\u6709\u503c\u7684\uff0c\u4e5f\u5c31\u662f\u6570\u636e\u5e93\u91cc\u9762\u4fdd\u5b58\u7684 1\/2\uff0c\u4e0d\u8fc7\uff0c\u522b\u5fd8\u4e86\uff0c\u4e0a\u9762\u63d0\u5230\u7684\u4f17\u591a getActualClassNameForMorph<\/code> \u8c03\u7528\u8005\u4e2d\uff0c\u5c31\u6709\u8fd9\u4e2a morphInstanceTo<\/code>,\u662f\u7684\uff0c\u6ca1\u9519\u3002\u3002\u3002\u6211\u4eec\u8fd8\u53ef\u80fd\u9700\u8981\u91cd\u5199 getActualClassNameForMorph<\/code> \u65b9\u6cd5\u6765\u5e94\u5bf9\u6ca1\u6709\u9884\u52a0\u8f7d\u7684\u60c5\u51b5\u3002<\/p>\n\u73b0\u5728\u52a0\u4e0a\u4e4b\u524d\u7684 getActualClassNameForMorph<\/code> \u5b9e\u73b0\uff0c\u5c31\u6210\u4e86\u4e0b\u9762\u8fd9\u6837<\/p>\npublic function commentable(): MorphTo\n{\n return $this->morphTo();\n} \n\npublic static function getActualClassNameForMorph($class)\n{\n return match ((int) $class) {\n 1 => Post::class,\n 2 => Video::class,\n default => parent::getActualClassNameForMorph($class),\n };\n}\n\npublic function commentableType(): Attribute\n{\n return Attribute::get(fn($value) => match ((int) $value) {\n 1 => Post::class,\n 2 => Video::class,\n default => $value,\n });\n}\n<\/code><\/pre>\n\u4f60\u8fd8\u53ef\u4ee5\u4f7f\u7528\u65e7\u7248\u7684 get*Attribute<\/code> \u65b9\u6cd5\u3002<\/p>\npublic function commentable(): MorphTo\n{\n return $this->morphTo();\n} \n\npublic static function getActualClassNameForMorph($class)\n{\n return match ((int) $class) {\n 1 => Post::class,\n 2 => Video::class,\n default => parent::getActualClassNameForMorph($class),\n };\n}\n\npublic function getCommentableTypeAttribute($value)\n{\n return match ((int) $value) {\n 1 => Post::class,\n 2 => Video::class,\n default => $value,\n };\n}\n<\/code><\/pre>\n\u73b0\u5728\uff0c\u5237\u65b0\u9875\u9762\uff0c\u4f60\u4f1a\u53d1\u73b0\u57fa\u672c\u5df2\u7ecf\u5b8c\u7f8e\u4e86\uff0c\u6211\u4eec\u6ca1\u6709\u6539\u53d8\u4efb\u4f55 Laravel \u5185\u90e8\u7684\u4ee3\u7801\uff0c\u53ea\u662f\u6539\u53d8\u4e86\u6211\u4eec\u7684\u6a21\u578b\u3002<\/p>\n
\u73b0\u5728\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee commentable \uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528 with\/load<\/p>\n
\u5230\u6b64\u5c31\u5b8c\u7f8e\u4e86\u5417\uff1f<\/p>\n
\u4e0d\uff0c\u5e76\u6ca1\u6709<\/p>\n
\u4ed4\u7ec6\u89c2\u5bdf\uff0c\u4f60\u4f1a\u53d1\u73b0\u4e0a\u9762\u8fd9\u4e2a\u65b9\u6848\u8fd8\u5b58\u5728\u4e00\u4e2a\u5c0f\u5c0f\u7684\u95ee\u9898\uff0c\u90a3\u5c31\u662f\u6211\u4eec\u5fc5\u987b\u8981\u8986\u76d6 commentable_type \u7684\u8bfb\u51fa\u5b57\u6bb5\uff0c\u8fd9\u6837\u6211\u4eec\u5982\u679c\u9700\u8981\u5728\u63a5\u53e3\u8fd4\u56de\u65f6\uff0c\u5c31\u4f1a\u663e\u793a\u6210\u6211\u4eec\u8f6c\u6362\u540e\u7684\u7c7b\u540d\u4e86\uff0c\u800c\u4e0d\u662f\u539f\u59cb\u7684 1\/2\uff0c\u90a3\u4e48\u6709\u6ca1\u6709\u529e\u6cd5\u5462\uff0c\u5176\u5b9e\u662f\u6709\u7684\uff0c\u90a3\u5c31\u662f\u518d\u65b0\u5efa\u4e00\u4e2a commentTypeRef \u7684\u5b57\u6bb5\uff0c\u5728\u8fd9\u91cc\u9762\u8fd4\u56de\u539f\u59cb\u503c\uff0c\u73b0\u5728\u4f60\u7684 Comment \u6a21\u578b\u5e94\u8be5\u5c31\u4f1a\u50cf\u4e0b\u9762\u8fd9\u6837\u3002<\/p>\n
<?php\n\nnamespace App\/Models;\n\nuse Illuminate\/Database\/Eloquent\/Casts\/Attribute;\nuse Illuminate\/Database\/Eloquent\/Factories\/HasFactory;\nuse Illuminate\/Database\/Eloquent\/Model;\nuse Illuminate\/Database\/Eloquent\/Relations\/MorphTo;\n\nclass Comment extends Model\n{\n use HasFactory;\n\n protected $appends = ['commentable_type_ref'];\n\n public static function getActualClassNameForMorph($class)\n {\n return match ((int) $class) {\n 1 => Post::class,\n 2 => Video::class,\n default => parent::getActualClassNameForMorph($class),\n };\n }\n\n public function commentable(): MorphTo\n {\n return $this->morphTo();\n }\n\n public function commentableType(): Attribute\n {\n return Attribute::get(fn($value) => match ((int) $value) {\n 1 => Post::class,\n 2 => Video::class,\n default => $value,\n });\n }\n\n public function commentableTypeRef(): Attribute\n {\n return Attribute::get(fn() => (int) $this->attributes['commentable_type']);\n }\n\n\n}\n<\/code><\/pre>\n\u73b0\u5728\u63a5\u53e3\u4f1a\u8fd4\u56de\u4e00\u4e2a commentable_type_ref<\/code> \u5b57\u6bb5\uff0c\u6211\u8fd9\u91cc\u5077\u61d2\u4e86\uff0c\u76f4\u63a5\u8f6c\u4e3a int \u4e86\u3002<\/p>\n\u5f88\u597d\uff0c\u4f46\u7f8e\u4e2d\u4e0d\u8db3\uff0c\u95ee\u9898\u867d\u7136\u89e3\u51b3\u4e86\uff0c\u4f46\u662f\u524d\u7aef\u539f\u6765\u7528\u6765\u5224\u65ad\u7684\u5b57\u6bb5\u53d8\u4e86\uff0c\u4e0d\u8fc7\u8fd9\u4e5f\u65e0\u4f24\u5927\u96c5\uff0c\u8ddf\u524d\u7aef\u53cb\u597d\u6c9f\u901a\u4e00\u4e0b\u5c31\u597d\u4e86\u3002<\/p>\n
\u5982\u679c\u4f60\u60f3\u66f4\u8fdb\u4e00\u6b65\uff0c\u90a3\u4e0d\u59a8\u7ee7\u7eed\u770b\u770b\u3002<\/p>\n
\u66f4\u8fdb\u4e00\u6b65<\/h3>\n
\u5728\u4e0a\u9762\u7684\u5185\u5bb9\u4e2d\uff0c\u6211\u4eec\u57fa\u672c\u5df2\u7ecf\u89e3\u51b3\u4e86\u6211\u4eec\u7684\u9700\u6c42\uff0c\u53ea\u662f\u6709\u4e00\u4e9b\u5c0f\u7455\u75b5\u3002<\/p>\n
\u73b0\u5728\u6765\u601d\u8003\u4e00\u4e2a\u95ee\u9898\uff0c\u5728\u6211\u4eec\u521b\u5efa\u6a21\u578b\u5173\u8054\u7684\u65f6\u5019\uff0c\u4f7f\u7528\u5230\u7684\u5b57\u6bb5\uff0c\u662f\u5fc5\u987b\u8981\u6570\u636e\u5e93\u4e2d\u5b58\u5728\u7684\u5417\uff1f<\/p>\n
<?php\n\nnamespace App\/Models;\n\nuse Illuminate\/Database\/Eloquent\/Casts\/Attribute;\nuse Illuminate\/Database\/Eloquent\/Factories\/HasFactory;\nuse Illuminate\/Database\/Eloquent\/Model;\nuse Illuminate\/Database\/Eloquent\/Relations\/BelongsTo;\nuse Illuminate\/Database\/Eloquent\/Relations\/MorphMany;\n\nclass Post extends Model\n{\n use HasFactory;\n\n public function comments(): MorphMany\n {\n return $this->morphMany(Comment::class, 'commentable');\n }\n\n public function user(): BelongsTo\n {\n return $this->belongsTo(User::class, 'user_id');\n }\n\n public function userId(): Attribute\n {\n return Attribute::get(fn() => $this->id);\n }\n}\n<\/code><\/pre>\n\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u4e3a Post \u6a21\u578b\u521b\u5efa\u4e86\u4e00\u4e2a user \u7684\u5173\u7cfb\uff0c\u5982\u679c\u4f60\u67e5\u770b\u6700\u521d\u7684\u8868\u5b9a\u4e49\u4ee3\u7801\uff0c\u4f60\u4f1a\u53d1\u73b0\uff0cposts \u8868\u91cc\u9762\u5e76\u6ca1\u6709 user_id \u8fd9\u4e2a\u5b57\u6bb5\uff0c\u800c\u6211\u5374\u5728\u4e0b\u9762\u4f7f\u7528\u83b7\u53d6\u5176\u521b\u5efa\u4e86\u4e00\u4e2a user_id \u5b57\u6bb5\uff0c\u90a3\u8fd9\u6837\u80fd\u884c\u5417\uff1f<\/p>\n
\u7b54\u6848\u662f\u53ef\u884c\u7684\u3002<\/p>\n
Route::get('\/', function () {\n- $comments = \/App\/Models\/Comment::limit(5)->get();\n-\n- $comments->load('commentable');\n- $comment = $comments->first();\n- $commentable = $comment->commentable;\n-\n- return $comments;\n-\n+ \n+ $post = \/App\/Models\/Post::with('user')->first();\n+\n+ return $post;\n});\n<\/code><\/pre>\n{\n "id": 1,\n "title": "voluptatibus",\n "content": "fugit",\n "created_at": "2024-11-29T15:44:42.000000Z",\n "updated_at": "2024-11-29T15:44:42.000000Z",\n "user": {\n "id": 1,\n "name": "Test User",\n "email": "test@example.com",\n "email_verified_at": "2024-12-01T03:53:24.000000Z",\n "created_at": "2024-12-01T03:53:24.000000Z",\n "updated_at": "2024-12-01T03:53:24.000000Z"\n }\n}<\/code><\/pre>\n\u6ca1\u9519\uff0c\u5b83\u53ef\u4ee5\u6b63\u786e\u7684\u52a0\u8f7d\u51fa user \u6765\uff0c\u5e76\u4e14\u8fd8\u53ef\u4ee5\u4f7f\u7528 with\/load \u548c\u76f4\u63a5\u8bbf\u95ee\u3002<\/p>\n
\u6709\u6ca1\u6709\u4e00\u70b9\u70b9\u7684\u60ca\u8bb6\uff0c\u8fd9\u4fbf\u662f\u89e3\u51b3\u524d\u9762\u8fd9\u4e2a\u95ee\u9898\u7684\u6240\u5728\u3002<\/p>\n
\u73b0\u5728\uff0c \u56de\u5230 Comment \u6a21\u578b\uff0c\u628a\u539f\u672c commentable \u91cc\u9762\u7684 morphTo \u53c2\u6570\u5b8c\u5584\u4e00\u4e0b,\uff0c\u540c\u65f6\u6e05\u7406\u6389\u4e0d\u518d\u9700\u8981\u7684 commentable_type_ref \u5427\uff0c\u73b0\u5728\u8ba9\u6211\u4eec\u7528\u56de\u4e4b\u524d\u7684\u6d4b\u8bd5\u4ee3\u7801\u3002<\/p>\n
-protected $appends = ['commentable_type_ref'];\n\n...\n\npublic function commentable(): MorphTo\n{\n- return $this->morphTo();\n+ return $this->morphTo('commentable', 'commentable_type_class', 'commentable_id', 'id');\n}\n\n-public function commentableType(): Attribute\n+public function commentableTypeClass(): Attribute\n{\n- return Attribute::get(fn($value) => match ((int) $value) {\n+ return Attribute::get(fn() => match ((int) $this->commentable_type) {\n 1 => Post::class,\n 2 => Video::class,\n- default => $value,\n+ default => $this->commentable_type,\n });\n}\n\n\n-public function commentableTypeRef(): Attribute\n-{\n- return Attribute::get(fn() => (int) $this->attributes['commentable_type']);\n-}\n\n<\/code><\/pre>\n\u5f97\u5230\u7ed3\u679c<\/p>\n
[\n {\n "id": 1,\n "commentable_type": "1",\n "commentable_id": 5,\n "body": "iste",\n "created_at": "2024-11-29T15:48:28.000000Z",\n "updated_at": "2024-11-29T15:48:28.000000Z",\n "commentable": {\n "id": 5,\n "title": "sunt",\n "content": "numquam",\n "created_at": "2024-11-29T15:48:28.000000Z",\n "updated_at": "2024-11-29T15:48:28.000000Z"\n }\n }\n]<\/code><\/pre>\n\u73b0\u5728\uff0c\u5b8c\u7f8e\u4e86\u6ca1\uff1f\u6211\u53ea\u60f3\u8bf4\uff0c \u8fd8\u5dee\u4e00\u70b9\u70b9~<\/p>\n
\u4e3a\u4e86\u540e\u9762\u7684\u6b65\u9aa4\u66f4\u6e05\u6670\uff0c\u6211\u5148\u6765\u88c5\u4e00\u4e2a laravel-debugger<\/code><\/p>\ncomposer require barryvdh\/laravel-debugbar --dev<\/code><\/pre>\n\u522b\u5fd8\u4e86\u5728 .env<\/code> \u4e2d\u6dfb\u52a0\u914d\u7f6e\u9879\u4ee5\u542f\u7528<\/p>\nDEBUGBAR_ENABLED=true<\/code><\/pre>\n\u55f7\uff0c\u73b0\u5728\u4f60\u8bbf\u95ee\u63a5\u53e3\u5e94\u8be5\u4e0d\u4f1a\u770b\u5230 laravel-debugger\uff0c\u8fd9\u662f\u56e0\u4e3a\u4ed6\u4e0d\u4f1a\u5bf9 JSON \u54cd\u5e94\u751f\u6548\uff0c\u5982\u679c\u60f3\u8981\u770b\u5230\uff0c\u53ef\u4ee5\u968f\u4fbf\u8bbf\u95ee\u4e00\u4e2a 404 \u9875\u9762\uff0c\u7136\u540e\u5c31\u80fd\u770b\u5230\u90a3\u4e2a\u719f\u6089\u7684 icon \u4e86\uff0c\u7136\u540e\u70b9\u51fb icon\uff0c\u518d\u70b9\u51fb\u53f3\u4e0a\u89d2\u7684\u4ece\u53f3\u81f3\u5de6\u7b2c\u4e09\u4e2a\u56fe\u6807\uff08\u6253\u5f00\u6587\u4ef6\uff09\uff0c\u9009\u62e9\u5176\u4ed6\u9875\u9762\u7684\u8bf7\u6c42\u3002<\/p>\n
![\"image.png\"](\"https:\/\/segmentfault.com\/img\/bVdfbpQ\" "\\"image.png\\"")
<\/p>\n
\u73b0\u5728\uff0c\u628a\u6211\u4eec\u7684\u6d4b\u8bd5\u4ee3\u7801\u6539\u6210\u4e0b\u9762\u8fd9\u6837<\/p>\n
Route::get('\/', function () {\n $comments = \/App\/Models\/Comment::limit(1)->get();\n $comment = $comments->first();\n\n return $comment->commentable;\n});<\/code><\/pre>\n\u7136\u540e\u4f60\u5c31\u5f97\u5230\u4e86\u7ed3\u679c<\/p>\n
{\n "id": 5,\n "commentable_type": "1",\n "commentable_id": 5,\n "body": "reprehenderit",\n "created_at": "2024-11-29T15:48:28.000000Z",\n "updated_at": "2024-11-29T15:48:28.000000Z"\n}<\/code><\/pre>\n\u662f\u7684\uff0c\u4f60\u6ca1\u6709\u770b\u9519\u2026\u2026\uff0c\u8fd9\u91cc\u660e\u660e\u8fd4\u56de\u7684\u662f commentable\uff0c\u4e5f\u5c31\u662f\u539f\u672c\u5e94\u8be5\u8fd4\u56de Post \u6216\u8005 Video \u7684\uff0c\u8fd9\u91cc\u5374\u8c8c\u4f3c\u8fd4\u56de\u4e86 comments.id = 5 \u7684\u6570\u636e\uff0c\u6709\u4e9b\u79bb\u8c31\u5427\u3002\u3002\u3002<\/p>\n
![\"](\"https:\/\/segmentfault.com\/img\/remote\/1460000045525586\" "\\"\u591a\u6001\u5173\u8054\u7684\u6a21\u578b\u672c\u5730\u5316\u5957\u7528.assetsimage-20241201122814943.png\\"\\"")
<\/p>\n
\u8fd8\u8bb0\u5f97\u6211\u4eec\u524d\u9762\u63d0\u5230\u7684 morphTo<\/code> \u65b9\u6cd5\u5417\uff1f\u8fd9\u91cc\u4e5f\u4f1a\u8d70\u5230\u7684\u5594\uff0c\u4ed6\u4f1a\u4f7f\u7528 getAttributeFromArray<\/code> \u6765\u83b7\u53d6 $attributes<\/code> \u5c5e\u6027\u4e0a\u7684\u5b57\u6bb5\u6765\u5224\u65ad\uff08\u5728\u8fd9\u91cc\u7406\u8bba\u4e0a\u662f\u6570\u636e\u5e93\u4e2d\u7684\u5b57\u6bb5\uff09\uff0c\u5982\u679c\u83b7\u53d6\u5230\u4e86\uff0c\u4ed6\u4f1a\u8c03\u7528 morphInstanceTo<\/code>\uff0c\u53cd\u4e4b\u4ed6\u5219\u8ba4\u4e3a\u8fd9\u662f\u4e00\u4e2a\u6765\u81ea with<\/code>\u7684\u8c03\u7528\uff0c\u7ee7\u800c\u8c03\u7528 morphEagerTo<\/code><\/p>\n\u800c\u6211\u4eec\u8fd9\u91cc\u7684 commentable_type_class<\/code> \u5176\u5b9e\u662f\u865a\u6784\u800c\u6765\u7684\uff0c\u5b83\u5e76\u4e0d\u5b58\u5728\u4e8e\u6570\u636e\u5e93\u4e2d\u7684\u771f\u5b9e\u5b57\u6bb5\uff0c\u81ea\u7136\uff0c\u8fd9\u91cc\u83b7\u53d6\u51fa\u6765\u7684\u5c31\u6210\u4e86\u7a7a\uff0c\u8fdb\u5165\u4e86\u9884\u52a0\u8f7d\u7684\u903b\u8f91\uff0c\u800c\u5b9e\u9645\u4e0a\u6211\u4eec\u5176\u5b9e\u662f\u5728\u76f4\u63a5\u8bbf\u95ee\u672a\u9884\u52a0\u8f7d\u7684\u6570\u636e\uff0c\u5c31\u5bfc\u81f4\u4e86\u8fd9\u4e2a\u9519\u8bef\u3002<\/p>\n\u5982\u4f55\u4fee\u590d\u8fd9\u4e2a\u95ee\u9898\uff1f\u65e2\u7136\uff0c\u6211\u4eec\u9700\u8981\u7ed9\u6570\u636e\u5e93\u8fd4\u56de\u7684\u7ed3\u679c\u6dfb\u52a0\u4e00\u4e2a\u5b57\u6bb5\uff0c\u90a3\u5728 select \u7684\u65f6\u5019\uff0c\u5904\u7406\u4e00\u4e0b\u4e0d\u5c31\u597d\u4e86\u5417\uff1f<\/p>\n
Route::get('\/', function () {\n $comments = \/App\/Models\/Comment::select(['*', DB::raw("CASE\n WHEN commentable_type = 1 THEN '\/\/App\/\/Models\/\/Post'\n WHEN commentable_type = 2 THEN '\/\/App\/\/Models\/\/Video'\n ELSE commentable_type\n END AS commentable_type_class")])->limit(1)->get();\n $comment = $comments->first();\n\n return $comment->commentable;\n});\n<\/code><\/pre>\n\u786e\u5b9e\uff0c\u6211\u4eec\u901a\u8fc7\u8fd9\u6837\u89e3\u51b3\u4e86\u524d\u9762\u7684 bug\uff0c\u5b9e\u73b0\u6211\u4eec\u7684\u9700\u6c42\uff0c\u53ea\u662f\u4ee3\u7801\u770b\u8d77\u6765\u6709\u4ebf\u70b9\u70b9\u7cdf\u7cd5 \ud83e\udd14<\/p>\n
\u4ec0\u4e48\uff1f\u8fd8\u6709\u9ad8\u624b\uff01<\/p>\n
\u6700\u7ec8\u65b9\u6848<\/h3>\n
\u5176\u5b9e\u53c2\u8003\u524d\u9762\u7684\u5185\u5bb9\u4e0d\u96be\u53d1\u73b0\uff0c\u6211\u4eec\u524d\u9762\u90fd\u5b8c\u6210\u4e86\uff0c\u53ea\u662f\uff0c\u5728\u6700\u540e\u4e00\u90e8\uff0c\u9700\u8981\u5411 $attributes<\/code> \u6dfb\u52a0\u5b57\u6bb5\u8fd9\u91cc\u5361\u4f4f\u4e86\uff0c\u90a3\u4e48\uff0c\u6709\u6ca1\u6709\u4ec0\u4e48\u65b9\u6cd5\uff0c\u53ef\u4ee5\u8ba9\u6211\u4eec\u5728 $attributes<\/code> \u4e0a\u6dfb\u52a0\u5b57\u6bb5\u5462\uff0c\u7b54\u6848\u662f\u6709\u7684\u3002<\/p>\n\u4f60\u53ef\u80fd\u4f1a\u60f3\u5230\uff0c\u5982\u679c\u53ea\u662f\u5f80\u4e0a\u9762\u6dfb\u52a0\u4e00\u4e2a\u5b57\u6bb5\uff0c\u90a3\u76f4\u63a5\u8986\u76d6\u6a21\u578b\u7684 boot \u65b9\u6cd5\u7136\u540e\u7ed9 $attributes<\/code> \u8ffd\u52a0\u4e00\u4e2a\u4e0d\u5c31\u597d\u4e86\u3002<\/p>\n\u4f46\u662f\uff0c\u90a3\u8fd8\u662f\u53ef\u80fd\u4f1a\u5f71\u54cd\u5230\u4e0a\u9762\u7684 morphTo \u65b9\u6cd5\uff0c\u6240\u4ee5\uff0c\u6211\u4eec\u7684\u6700\u7ec8\u76ee\u7684\u662f\uff0c\u8981\u627e\u5230\u4e00\u4e2a\u5408\u9002\u7684\u65f6\u673a\u53bb\u6dfb\u52a0\uff0c\u5e76\u4e14\u8fd8\u8981\u5c3d\u53ef\u80fd\u7684\u8003\u8651\u53ef\u80fd\u5e26\u6765\u7684\u5176\u4ed6\u95ee\u9898\u3002<\/p>\n
\u800c Laravel \u7684\u6a21\u578b\u4e2d\u6070\u597d\u6709\u8fd9\u4e00\u7c7b\u4e0d\u540c\u65f6\u673a\u8c03\u7528\u7684\u65b9\u6cd5\uff0c\u90a3\u5c31\u662f\u6a21\u578b\u4e8b\u4ef6\u3002<\/p>\n
\u9009\u62e9\u4e00\u4e2a\u5408\u9002\u7684\u6a21\u578b\u4e8b\u4ef6<\/h4>\n
\u6253\u5f00 Laravel \u6587\u6863\uff0c\u53ef\u4ee5\u770b\u5230\u6a21\u578b\u6709\u4ee5\u4e0b\u4e8b\u4ef6\u3002<\/p>\n
\n\n\n\u4e8b\u4ef6\u540d\u79f0<\/th>\n \u89e6\u53d1\u65f6\u673a<\/th>\n<\/tr>\n<\/thead>\n \n\nretrieved<\/code><\/td>\n\u5f53\u6a21\u578b\u5b9e\u4f8b\u4ece\u6570\u636e\u5e93\u4e2d\u68c0\u7d22\u51fa\u6765\u65f6\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \ncreating<\/code><\/td>\n\u5728\u4fdd\u5b58\u6a21\u578b\u4e4b\u524d\u89e6\u53d1\uff08\u521b\u5efa\u65b0\u8bb0\u5f55\uff09\u3002<\/td>\n<\/tr>\n \ncreated<\/code><\/td>\n\u5728\u6a21\u578b\u6210\u529f\u4fdd\u5b58\u5230\u6570\u636e\u5e93\u540e\u89e6\u53d1\uff08\u65b0\u8bb0\u5f55\uff09\u3002<\/td>\n<\/tr>\n \nupdating<\/code><\/td>\n\u5728\u66f4\u65b0\u73b0\u6709\u6a21\u578b\u65f6\uff0c\u6570\u636e\u88ab\u63d0\u4ea4\u5230\u6570\u636e\u5e93\u4e4b\u524d\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \nupdated<\/code><\/td>\n\u5728\u6a21\u578b\u6210\u529f\u66f4\u65b0\u540e\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \nsaving<\/code><\/td>\n\u5728\u4fdd\u5b58\u6a21\u578b\u4e4b\u524d\u89e6\u53d1\uff08\u5305\u62ec\u521b\u5efa\u548c\u66f4\u65b0\uff09\u3002<\/td>\n<\/tr>\n \nsaved<\/code><\/td>\n\u5728\u6a21\u578b\u6210\u529f\u4fdd\u5b58\u540e\u89e6\u53d1\uff08\u5305\u62ec\u521b\u5efa\u548c\u66f4\u65b0\uff09\u3002<\/td>\n<\/tr>\n \ndeleting<\/code><\/td>\n\u5728\u5220\u9664\u6a21\u578b\u4e4b\u524d\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \ndeleted<\/code><\/td>\n\u5728\u6a21\u578b\u6210\u529f\u5220\u9664\u540e\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \ntrashed<\/code><\/td>\n\u5f53\u6a21\u578b\u88ab\u8f6f\u5220\u9664\uff08\u5373 delete()<\/code>\uff09\u65f6\u89e6\u53d1\u3002<\/td>\n<\/tr>\n\nforceDeleting<\/code><\/td>\n\u5728\u5f3a\u5236\u5220\u9664\uff08\u5373 forceDelete()<\/code>\uff09\u4e4b\u524d\u89e6\u53d1\uff08\u8df3\u8fc7\u8f6f\u5220\u9664\uff09\u3002<\/td>\n<\/tr>\n\nforceDeleted<\/code><\/td>\n\u5728\u5f3a\u5236\u5220\u9664\u540e\u89e6\u53d1\uff08\u8df3\u8fc7\u8f6f\u5220\u9664\uff09\u3002<\/td>\n<\/tr>\n \nrestoring<\/code><\/td>\n\u5728\u6062\u590d\u8f6f\u5220\u9664\u7684\u6a21\u578b\u65f6\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \nrestored<\/code><\/td>\n\u5728\u6062\u590d\u8f6f\u5220\u9664\u7684\u6a21\u578b\u6210\u529f\u540e\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \nreplicating<\/code><\/td>\n\u5728\u590d\u5236\u6a21\u578b\u5b9e\u4f8b\uff08\u4f7f\u7528 replicate()<\/code>\uff09\u65f6\u89e6\u53d1\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\u770b\u5230\u4ee5\u4e0a\u8868\u683c\uff0c\u4f60\u5e94\u8be5\u4e00\u773c\u5c31\u770b\u5230\u4e86 retrieved<\/code> \u4e8b\u4ef6\uff0c\u662f\u7684\uff0c\u6ca1\u9519\uff0c\u6211\u4eec\u5c31\u9700\u8981\u5728\u6a21\u578b\u4ece\u6570\u636e\u5e93\u4e2d\u88ab\u68c0\u7d22\u51fa\u6765\u7684\u65f6\u5019\u53bb\u5904\u7406\uff0c\u73b0\u5728\u6539\u5199\u6211\u4eec\u7684 Comment \u6a21\u578b\u4ee3\u7801\u3002<\/p>\n<?php\n\nnamespace App\/Models;\n\nuse Illuminate\/Database\/Eloquent\/Factories\/HasFactory;\nuse Illuminate\/Database\/Eloquent\/Model;\nuse Illuminate\/Database\/Eloquent\/Relations\/MorphTo;\n\nclass Comment extends Model\n{\n use HasFactory;\n\n protected static function booted()\n {\n parent::booted();\n\n self::retrieved(function (Comment $comment) {\n $comment->attributes['commentable_type_class'] = match ((int) $comment->commentable_type) {\n 1 => Post::class,\n 2 => Video::class,\n default => $comment->commentable_type,\n };\n\n $comment->makeHidden(['commentable_type_class']);\n });\n }\n\n\n public function commentable(): MorphTo\n {\n return $this->morphTo('commentable', 'commentable_type_class', 'commentable_id', 'id');\n }\n\n}\n<\/code><\/pre>\n\u9996\u5148\uff0c\u5148\u8986\u76d6\u6389 booted \u65b9\u6cd5\uff0c\u5e76\u8c03\u7528 parent::booted()<\/code>\uff0c\u7136\u540e\u5f00\u59cb\u6211\u4eec\u7684\u903b\u8f91\u3002<\/p>\n\u5728 retrieved<\/code> \u65f6\uff0c\u6211\u4eec\u4fee\u6539\u4f20\u5165\u7684 Comment \u6a21\u578b\uff0c\u5411\u5176 $attributes<\/code> \u4e0a\u6dfb\u52a0\u4e00\u4e2a comment_type_class<\/code><\/p>\n\u4e0e\u6b64\u540c\u65f6\uff0c\u56e0\u4e3a\u6211\u4eec\u5e76\u4e0d\u5e0c\u671b\u8fd9\u4e2a\u5b57\u6bb5\u8fd4\u56de\u5230\u6211\u4eec\u7684\u54cd\u5e94\u4e2d\uff0c\u6240\u4ee5\u6211\u4eec\u4f7f\u7528\u4e86
classDiagram\ndirection BT\nclass comments {\n varchar commentable_type\n integer commentable_id\n text body\n datetime created_at\n datetime updated_at\n integer id\n}\nclass posts {\n varchar title\n text content\n datetime created_at\n datetime updated_at\n integer id\n}\nclass videos {\n varchar title\n varchar url\n datetime created_at\n datetime updated_at\n integer id\n}\n<\/code><\/pre>\n\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u6211\u4eec\u5b58\u5728\u4e09\u5f20\u8868\uff0c\u5176\u4e2d\uff0ccomments \u4f7f\u7528 commentable_id \u5206\u522b\u4e0e posts \u548c videos \u5173\u8054\uff0c\u81f3\u4e8e\u5177\u4f53\u9700\u8981\u5173\u8054\u54ea\u4e00\u4e2a\u6a21\u578b\uff0c\u5219\u9700\u8981\u6839\u636e commentable_type \u6765\u51b3\u5b9a\u3002<\/p>\n
\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cLaravel \u5728 commentable_type \u4e2d\u586b\u5145\u7684\u662f Post \u548c Video \u6a21\u578b\u7684\u5b8c\u6574\u547d\u540d\u7a7a\u95f4\u7c7b\u540d\u3002\u4e5f\u5c31\u662f\u5206\u522b\u4e3a\uff1aApp\/Models\/Post<\/code> \u548c App\/Models\/Video<\/code>\uff0c\u8fd9\u4e2a\u8bbe\u8ba1\u5e26\u6765\u4e86\u4e00\u4e9b\u5c0f\u95ee\u9898\u3002<\/p>\n\n- \u6211\u4eec\u7684 type \u5b57\u6bb5\u548c\u5b9e\u4f53\u7c7b\u540d\u5f3a\u5173\u8054\u4e86\uff0c\u5982\u679c\u5c06\u6765\u7c7b\u53ef\u80fd\u8981\u6539\u540d\u5b57\uff0c\u5c31\u52bf\u5fc5\u8981\u4fee\u6539\u6570\u636e\u5e93\u5185\u7684\u6570\u636e\u624d\u884c\u3002<\/li>\n
- \u8fd9\u91cc\u9762\u5305\u542b\u4e86
\/<\/code> \u8fd9\u4e2a \u201c\u9ebb\u70e6\u201d\u7684\u5b57\u7b26\uff0c\u6709\u4e9b SQL \u5de5\u5177\u4f60\u8fd8\u9700\u8981\u591a\u6b21\u8f6c\u4e49\u540e\u624d\u80fd\u6784\u6210\u6700\u7ec8\u7684\u67e5\u8be2\uff0c\u5c24\u5176\u662f\u6709\u4e9b\u7279\u522b\u7684\u67e5\u8be2\u3002<\/li>\n- \u8fd9\u91cc\u5b8c\u6574\u7684\u7c7b\u540d\u592a\u8fc7\u4e8e\u5197\u957f\uff0c\u4ed6\u4eec\u51e0\u4e4e\u90fd\u6709\u4e00\u6837\u7684\u524d\u7f00\uff0c\u53ea\u662f\u540e\u9762\u7684\u7c7b\u540d\u4e0d\u4e00\u6837\u800c\u5df2\u3002<\/li>\n<\/ul>\n
\u57fa\u4e8e\u4ee5\u4e0a\u7684\u95ee\u9898\uff0cLaravel \u5b98\u65b9\u4e5f\u63d0\u4f9b\u4e86\u89e3\u51b3\u65b9\u6848\uff0c\u5c31\u662f\u4f7f\u7528 Relation::morphMap<\/code> \u65b9\u6cd5\uff0c\u5b83\u7528\u8d77\u6765\u5c31\u50cf\u4e0b\u9762\u8fd9\u6837\u3002<\/p>\npublic function boot(){\n Relation::morphMap([\n 'post' => 'App\/Models\/Post',\n 'video' => 'App\/Models\/Video',\n ]);\n}<\/code><\/pre>\n\u7b49\u7b49\uff0c\u4e0d\u5bf9\u554a\uff0c\u6211\u770b\u6587\u6863\u4e2d\u660e\u660e\u662f Relation::enforceMorphMap<\/code>\uff0c\u4f60\u600e\u4e48\u8bf4\u662f morphMap<\/code>\uff0c\u5176\u5b9e\u90fd\u6ca1\u9519\uff0c\u867d\u7136\u4f60\u73b0\u5728\u770b\u5230\u6700\u65b0\u7684 Laravel \u6587\u6863\u4e2d\u63d0\u5230\u7684\u662f Relation::enforceMorphMap<\/code> \uff0c\u4f46\u662f\u5b9e\u9645\u4e0a\uff0cmorphMap<\/code> \u4e5f\u662f\u53ef\u4ee5\u7528\u7684\uff0c\u56e0\u4e3a\u8fd9\u662f\u4e4b\u524d\u9057\u7559\u4e0b\u7684\u65b9\u6cd5\uff0c\u90a3\u65e2\u7136\u6709 morphMap<\/code> \u4e86\uff0c\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981 enforceMorphMap<\/code>\uff1f<\/p>\n\u95ee\u5f97\u597d\uff0c\u5728\u4f7f\u7528 morphMap<\/code> \u6211\u4eec\u53ef\u4ee5\u9009\u62e9\u4e3a\u90e8\u5206\u7684 morph \u8bbe\u7f6e\u6620\u5c04\uff0c\u6bd4\u5982\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u53ef\u4ee5\u53ea\u6620\u5c04 post\u3001\u800c\u4e0d\u6620\u5c04 video\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u6570\u636e\u5e93\u4e2d\uff0cpost \u7684 type \u4fdd\u5b58\u7684\u662f post\u3001\u800c video \u5374\u4fdd\u5b58\u7684 App\/Models\/Video<\/code>\uff0c\u9020\u6210\u4e86\u4e00\u79cd\u4e0d\u4e00\u81f4\u4e86\u3002\u5c24\u5176\u662f\u8fd9\u91cc\u7684 \u201c\u591a\u6001\u201d\uff0c\u5c31\u610f\u5473\u7740\uff0c\u4e00\u5f00\u59cb\u53ef\u80fd\u53ea\u6709\u8fd9\u4e24\u4e2a\u7c7b\u578b\uff0c\u7ed3\u679c\u540e\u9762\u53c8\u65b0\u589e\u4e00\u4e2a\u7c7b\u578b\uff0c\u524d\u9762\u7684\u4f60\u90fd\u6620\u5c04\u4e86\uff0c\u800c\u540e\u9762\u7684\u540c\u4e8b\u5fd8\u4e86\u6620\u5c04\uff0c\u5c31\u5bfc\u81f4\u6570\u636e\u5e93\u91cc\u9762\u7684\u6570\u636e\u770b\u8d77\u6765\u4e71\u7cdf\u7cdf\u7684\u4e86\u3002<\/p>\n\u6240\u4ee5\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u81ea Laravel 8.x \u5f00\u59cb\uff0c\u5f15\u5165\u4e86 enforceMorphMap<\/a> \u8fd9\u4e2a Feature\uff0c\u5e76\u4e14\u6587\u6863\u91cc\u9762\u4e5f\u6539\u4e3a\u4e86\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u73b0\u5728\u5982\u679c\u4f60\u4f7f\u7528\u4e86\u8fd9\u4e2a\uff0c\u6a21\u578b\u5374\u5fd8\u4e86\u6620\u5c04\uff0c\u5c31\u4f1a\u629b\u51fa\u4e00\u4e2a ClassMorphViolationException<\/code> \u5f02\u5e38\uff0c\u800c\u4e0d\u662f\u50cf\u4e4b\u524d\u90a3\u6837\u9ed8\u4e0d\u4f5c\u58f0\uff0c\u4ece\u800c\u5e2e\u52a9\u4f60\u5728\u5f00\u53d1\u9636\u6bb5\u53d1\u73b0\u8fd9\u4e2a\u95ee\u9898\uff0c\u5b83\u5185\u90e8\u5176\u5b9e\u662f\u8c03\u7528\u4e86 requireMorphMap<\/code> + morphMap<\/code> \u800c\u5df2\uff0c\u5f53\u7136\uff0c\u5982\u679c\u4f60\u559c\u6b22\u4e4b\u524d\u90a3\u6837\uff0c\u8fd8\u662f\u53ef\u4ee5\u8c03\u7528\u65e7\u7684 morphMap<\/code> \u65b9\u6cd5 \u3002<\/p>\n\u9047\u5230\u7684\u95ee\u9898<\/h3>\n
\u5b9e\u9645\u4e0a\uff0c\u4e0a\u9762\u90fd\u662f\u7406\u60f3\u5b8c\u7f8e\u72b6\u6001\uff0c\u6709\u4e00\u4e9b\u7279\u522b\u7684\u9650\u5236\u3002<\/p>\n
\n- \u5b9a\u4e49\u7684\u522b\u540d\u5fc5\u987b\u662f\u5168\u5c40\u552f\u4e00\u7684\u3002<\/li>\n
- \u4f7f\u7528\u6570\u5b57\u4f5c\u4e3a\u522b\u540d\u65f6\uff0c\u88ab\u610f\u5916\u7684\u91cd\u7f6e\uff08Laravel < 5.5\uff09<\/li>\n<\/ul>\n
\u6709\u65f6\u5019\u6211\u4eec\u7684\u4e1a\u52a1\u4e2d\u5c31\u662f\u4f7f\u7528\u4e86\u6570\u5b57\u6765\u533a\u5206\u4e0d\u540c\u7684 type\uff0c\u5e76\u4e14\u4e0d\u540c\u6a21\u578b\u7684 type \u53ef\u80fd\u8fd8\u4f1a\u91cd\u590d\uff0c\u6bd4\u5982\u6211\u4eec\u5e0c\u671b\u5728 Comment \u4e2d\uff0ctype 1\/2 \u5206\u522b\u8868\u793a Post \u548c Video\uff0c\u800c\u5728 Attachment \u4e2d\uff0ctype 1\/2 \u53c8\u5206\u522b\u8868\u793a User \u548c Product\u3002<\/p>\n
\u901a\u5e38\u6211\u4eec\u76f4\u63a5\u8fd9\u6837\u505a\u7684\u8bdd\uff0c\u90fd\u4f1a\u5f97\u5230\u4e00\u4e2a\u9519\u8bef\uff1aClass name must be a valid object or a string<\/code>\uff0c\u5b83\u6765\u81ea\u4e8e PHP\uff0c\u56e0\u4e3a PHP \u5728\u5c1d\u8bd5 new \u8fd9\u4e2a\u7c7b\u7684\u65f6\u5019\uff0c\u65e0\u6cd5\u89e3\u6790\u4e86\u3002<\/p>\n\u8fd9\u4e2a\u9700\u6c42\u5f88\u201c\u5e38\u89c1\u201d\u662f\u5427\uff0c\u4f46\u662f\u76ee\u524d\u5374\u505a\u4e0d\u5230\u3002<\/p>\n
\u5728\u65e9\u671f\u7684\u7248\u672c\u4e2d\uff0c\u5176\u5b9e\u8fd8\u5b58\u5728\u53e6\u5916\u4e00\u4e2a\u7531 morphMap<\/code> \u5e26\u6765\u7684\u95ee\u9898<\/p>\n public static function morphMap(array $map = null, $merge = true)\n {\n $map = static::buildMorphMapFromModels($map);\n\n if (is_array($map)) {\n static::$morphMap = $merge && static::$morphMap\n ? array_merge(static::$morphMap, $map) : $map;\n }\n\n return static::$morphMap;\n }\n<\/code><\/pre>\n\u5982\u4e0a\u7684\u4ee3\u7801\u4e2d\uff0c\u5982\u679c\u6211\u4eec\u4f20\u5165\u7684\u6620\u5c04\u952e\u662f\u6570\u5b57\u7684\uff0c\u4ee3\u7801\u8fdb\u5165 array_merge \u7684\u5206\u652f\u65f6\uff0c\u5c31\u4f1a\u56e0\u4e3a array_merge \u5bfc\u81f4\u7d22\u5f15\u88ab\u91cd\u7f6e\u2026\u2026<\/p>\n
\n- Illuminate\/Database\/Eloquent\/Relations\/Relation::morphMap should allow numeric types \u00b7 Issue #12845 \u00b7 laravel\/framework<\/a><\/li>\n<\/ul>\n
\u5728\u4e0a\u9762\u7684\u8fd9\u4e2a\u8ba8\u8bba\u4e2d\uff0c\u8fd8\u63d0\u5230\u4e86\u53e6\u5916\u4e00\u4e2a\u95ee\u9898\uff0c\u5c31\u662f\u80fd\u5426\u4ee5\u7ec4\u7684\u65b9\u5f0f\uff0c\u4e3a\u6bcf\u4e2a\u90fd\u5b9a\u4e49\u6620\u5c04\uff0c\u4e0d\u8fc7\u8fd9\u4e2a\u95ee\u9898\u7684\u8ba8\u8bba\u5e76\u6ca1\u6709\u7ed3\u679c\uff0c\u4f46\u662f\u7c7b\u4f3c\u7684\u671f\u5f85\u8fd8\u662f\u633a\u591a\u7684\uff0c\u751a\u81f3\u8fd8\u51fa\u73b0\u4e86\u4e00\u4e9b\u504f\u95e8\u7684\u3002<\/p>\n
\n- \/[8.x] Option to use table names when morphing by taylorotwell \u00b7 Pull Request #38451 \u00b7 laravel\/framework<\/a><\/li>\n<\/ul>\n
\u8fd9\u4e2a PR \u4e2d\uff0c\u6dfb\u52a0\u4e86\u4e00\u4e2a Relation::morphUsingTableNames()<\/code> \u65b9\u6cd5\uff0c\u7528\u4e8e\u81ea\u52a8\u6620\u5c04\u8868\u540d\uff0c\u4f46\u662f\u56e0\u4e3a\u4e00\u4e9b\u590d\u6742\u7684\u539f\u56e0\uff0c\u8fd9\u4e2a PR \u6700\u540e\u8fd8\u662f\u88ab Revert \u4e86\uff0c\u56e0\u4e3a\u5b83\u8fd8\u5b58\u5728\u4e00\u4e9b\u5176\u4ed6\u4e0d\u80fd\u88ab\u4fee\u590d\u7684[\u95ee\u9898https:\/\/github.com\/laravel\/framework\/issues\/35519<\/a>]()\u3002<\/p>\n<\/p>\n
\u5176\u5b9e\u5728\u8fd9\u4e2a PR \u4e2d\uff0c\u8fd8\u6709\u53e6\u5916\u4e00\u4e2a\u58f0\u97f3<\/a>\uff1a<\/p>\n<\/p>\n
\nimliam<\/a><\/strong> on Aug 20, 2021<\/a><\/h4>\nWhile this code is being changed, maybe it would also be useful to add an optional property\/method to models (eg. morphableName<\/code>) that can be used – so each model can represent its own morphable name itself instead of being done elsewhere in a map?<\/p>\n<\/blockquote>\n\u5bfb\u627e\u89e3\u836f<\/h3>\n
\u4e0d\u8fc7\u503c\u5f97\u4e00\u63d0\u7684\u662f Laravel \u4e2d\u786e\u5b9e\u6709\u4e00\u4e2a\u5b58\u5728\u7c7b\u4f3c\u80fd\u529b\u7684\u65b9\u6cd5\uff0c\u90a3\u5c31\u662f HasRelationships::getActualClassNameForMorph<\/code>\uff0c\u76ee\u524d\uff0c\u4ed6\u4f1a\u5728\u4f60\u4f7f\u7528\u5355\u4e2a\u6a21\u578b<\/strong>\u8bbf\u95ee\u5c1a\u672a\u52a0\u8f7d\u7684\u591a\u6001\u6a21\u578b\u65f6\u88ab\u8c03\u7528\uff0c\u4f1a\u4f20\u5165 type \u7684\u503c\u4f5c\u4e3a\u53c2\u6570\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u6570\u636e\u5e93\u4e2d\u4fdd\u5b58\u7684\u662f 1 \uff0c\u8fd9\u91cc\u5c31\u4f1a\u4f20\u5165 1\u3002<\/p>\n\u8fd9\u4e2a\u65b9\u6cd5\u7684\u9ed8\u8ba4\u5b9e\u73b0\u5982\u4e0b\uff1a<\/p>\n
public static function getActualClassNameForMorph($class)\n {\n return Arr::get(Relation::morphMap() ?: [], $class, $class);\n }\n<\/code><\/pre>\n\u53ef\u4ee5\u770b\u5230\uff0c\u8fd9\u91cc\u5b9e\u9645\u4e0a\u5c31\u662f\u8c03\u7528\u4e86\u524d\u9762\u5b9a\u4e49\u7684\u6620\u5c04\u800c\u5df2\uff0c\u73b0\u5728\u6211\u4eec\u5230 Comment \u6dfb\u52a0\u8fd9\u4e2a\u65b9\u6cd5\u7684\u590d\u5199\uff1a<\/p>\n
public static function getActualClassNameForMorph($class)\n {\n return match ((int) $class) {\n 1 => Post::class,\n 2 => Video::class,\n default => parent::getActualClassNameForMorph($class),\n };\n }\n<\/code><\/pre>\n\u7136\u540e\u4f60\u5c31\u4f1a\u53d1\u73b0\u4e00\u4e2a\uff0c\u597d\u50cf\u786e\u5b9e\u53ef\u4ee5\u3002\u5f53\u4f60\u6267\u884c\u7f16\u5199\u4e0b\u9762\u7684\u4ee3\u7801\u65f6\uff0c\u4f60\u786e\u5b9e\u62ff\u5230\u4e86\u5bf9\u5e94\u7684 commentable<\/p>\n
dump(\/App\/Models\/Comment::first()->commentable);<\/code><\/pre>\n\u770b\u8d77\u6765\u5f88\u7f8e\u597d\uff0c\u4f60\u5e94\u66f4\u5f88\u5feb\u5c31\u4f1a\u53d1\u73b0\uff0c\u8fd9\u5b9e\u9645\u4e0a\u5e26\u6765\u4e86\u53e6\u5916\u4e00\u4e2a\u95ee\u9898\uff0c\u4f60\u6ca1\u6cd5\u4f7f\u7528 with \u548c load \u8fdb\u884c\u9884\u52a0\u8f7d\u5173\u7cfb\u4e86<\/strong>\u3002<\/p>\n\u5f53\u4f60\u4f7f\u7528 with \u6216\u8005 load \u65f6\uff0c\u4f60\u5c06\u4f1a\u5f97\u5230\u4e00\u4e2a\u8ddf\u6ca1\u6709\u4f7f\u7528\u8fd9\u4e2a\u65b9\u6cd5\u65f6\u4e00\u6837\u7684\u9519\u8bef\uff1aClass name must be a valid object or a string<\/code>\uff0c\u662f\u7684\uff0c\u6ca1\u9519\uff0c\u4ed6\u5c31\u662f\u771f\u7684\u6ca1\u6709\u4f7f\u7528\u8fd9\u4e2a\u65b9\u6cd5\u2026\u2026\uff0c\u60f3\u4e0d\u5230\u5427\u3002<\/p>\n\u8fd9\u5176\u5b9e\u662f Laravel \u7ed9\u6211\u4eec\u5f00\u7684\u4e00\u4e2a\u201c\u5c0f\u73a9\u7b11\u201d\uff0c\u5f53\u6211\u4eec\u4ece\u4e00\u4e2a\u5c1a\u672a\u9884\u52a0\u8f7d commentable \u7684\u6a21\u578b\u65f6\uff0c\u5982\u679c\u8bbf\u95ee commentable\uff0c\u90a3\u4e48 Laravel \u6309\u7167\u4ee5\u4e0b\u8def\u5f84\u6765\u8bbf\u95ee\u5230\u6211\u4eec\u521a\u521a\u8986\u76d6\u7684 getActualClassNameForMorph<\/code> \u65b9\u6cd5\u3002<\/p>\ngraph TD\n A[HasRelationships.morphInstanceTo]\n B[HasRelationships.morphTo]\n C[Comment.commentable]\n\n B --> A\n C --> B<\/code><\/pre>\nLaravel \u5148\u8c03\u7528\u4e86\u6211\u4eec\u7684\u5173\u7cfb\u65b9\u6cd5 commentable\uff0c\u7136\u540e\u5173\u7cfb\u91cc\u9762\u8c03\u7528\u4e86 morphTo\uff0c\u63a5\u7740\u53c8\u8c03\u7528\u4e86 morphInstanceTo\uff0c\u7136\u540e\u5728 morphInstanceTo \u8c03\u7528\u4e86\u6211\u4eec\u521a\u521a\u521b\u5efa\u7684\u65b9\u6cd5\u3002<\/p>\n
protected function morphInstanceTo($target, $name, $type, $id, $ownerKey)\n {\n $instance = $this->newRelatedInstance(\n static::getActualClassNameForMorph($target)\n );\n\n return $this->newMorphTo(\n $instance->newQuery(), $this, $id, $ownerKey ?? $instance->getKeyName(), $type, $name\n );\n }<\/code><\/pre>\n\u6ce8\u610f\uff0c\u8fd9\u91cc\u4e4b\u6240\u4ee5\u80fd\u591f\u8bbf\u95ee\u5230\u6211\u4eec\u5b9a\u4e49\u7684 getActualClassNameForMorph<\/code> \u65b9\u6cd5\uff0c\u6b63\u662f\u56e0\u4e3a\u8fd9\u91cc\u4f7f\u7528\u4e86 statis<\/code> \u8fdb\u884c\u8c03\u7528\uff08\u5ef6\u8fdf\u7ed1\u5b9a<\/a>\uff09<\/p>\n\u73b0\u5728\uff0c\u518d\u6765\u770b\u770b getActualClassNameForMorph<\/code> \u7684\u53e6\u4e00\u6761\u8bbf\u95ee\u8def\u5f84<\/p>\ngraph TD\n E[MorphTo.createModelByType]\n F[MorphTo.getResultsByType]\n G[MorphTo.getEager]\n H[Builder.eagerLoadRelation]\n I[Builder.eagerLoadRelations]\n J[Model.load]\n K[Builder.get]\n L[HasOneOrManyThrough.get]\n M[BelongsToMany.get]\n\n F --> E\n G --> F\n H --> G\n I --> H\n J --> I\n K --> I\n L --> I\n M --> I<\/code><\/pre>\n\u53ef\u4ee5\u770b\u5230\uff0c\u5e38\u7528\u7684 Builder.get \u548c Model.load \u90fd\u6700\u7ec8\u4f1a\u8bbf\u95ee\u5230 MorphTo.createModelByType<\/code>\u6700\u7ec8\u5728\u8fd9\u4e2a\u65b9\u6cd5\u91cc\u9762\u8c03\u7528\u4e86 getActualClassNameForMorph<\/code><\/p>\n public function createModelByType($type)\n {\n $class = Model::getActualClassNameForMorph($type);\n\n return tap(new $class, function ($instance) {\n if (! $instance->getConnectionName()) {\n $instance->setConnection($this->getConnection()->getName());\n }\n });\n }<\/code><\/pre>\n\u800c\u8fd9\u91cc\u5374\u4f7f\u7528\u4e86 Model \u8fdb\u884c\u8c03\u7528\uff0c\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f<\/p>\n
\u73b0\u5728\u6765\u4f1a\u770b\u4e00\u4e0b\u5b8c\u6574\u7684\u8c03\u7528\u8def\u5f84<\/p>\n
graph TD\n N[HasRelationships.getActualClassNameForMorph]\n A[HasRelationships.morphInstanceTo]\n B[HasRelationships.morphTo]\n C[Comment.commentable]\n E[MorphTo.createModelByType]\n F[MorphTo.getResultsByType]\n G[MorphTo.getEager]\n H[Builder.eagerLoadRelation]\n I[Builder.eagerLoadRelations]\n J[Builder.get]\n K[BelongsToMany.get]\n L[Model.load]\n M[HasOneOrManyThrough.get]\n\n A --> N\n B --> A\n C --> B\n E --> N\n F --> E\n G --> F\n H --> G\n I --> H\n J --> I\n K --> I\n L --> I\n M --> I<\/code><\/pre>\n\u53ef\u4ee5\u770b\u5230\uff0c\u5f53\u6211\u4eec\u76f4\u63a5\u8bbf\u95ee commentable \u7684\u65f6\u5019\uff0c\u5b9e\u9645\u4e0a\u662f\u8d70\u4e86\u5de6\u8fb9\u7684\u8def\u5f84\uff0c\u800c\u5f53\u6211\u4eec\u4f7f\u7528 with\/load \u65f6\u8d70\u7684\u662f\u53f3\u8fb9\u7684\u8def\u5f84\u3002<\/p>\n
\u6b64\u65f6\u6700\u5927\u7684\u533a\u522b\u5c31\u5728\u4e8e\uff0cHasRelationships<\/code> \u672c\u8eab\u662f\u4e00\u4e2a Trait\uff0c\u5b83\u5728\u57fa\u7840 Model \u4e2d\u88ab use\uff0c\u90a3\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u4e0a\u9762\u8c03\u7528 HasRelationships.morphInstanceTo<\/code> \u7684\u65f6\u5019 static<\/code> \u5b9e\u9645\u4e0a\u8fd8\u662f\u6211\u4eec\u8c03\u7528\u7684 Model\uff08Comment\uff09\uff0c\u800c MorphTo \u5462\uff1f\u5b83\u662f\u4e00\u4e2a\u5355\u72ec\u7684\u7c7b\uff0c\u6240\u4ee5\u8fd9\u91cc\u662f\u7528\u4e86 Model \u8fdb\u884c\u8c03\u7528\uff0c\u90a3\u6211\u8fd9\u91cc\u5c31\u8bbf\u95ee\u4e0d\u5230 Comment \u5417\uff1f\u5176\u5b9e\u4e0d\u7136\uff0c\u5728 MorphTo \u8fd9\u4e2a\u7c7b\u4e2d\uff0c\u56e0\u4e3a\u5176\u7956\u5148\u7c7b\u662f Relation\uff0c\u5176\u5b9e\u91cc\u9762\u6709\u4e00\u4e2a parent \u5c5e\u6027\uff0c\u8fd9\u4e2a\u5c5e\u6027\u4fdd\u5b58\u7684\u5c31\u662f Comment \u7684\u5b9e\u4f8b\u3002<\/p>\nclassDiagram\n Relation <|-- BelongsTo\n BelongsTo <|-- MorphTo\n\n Relation : +Model parent\n class Relation\n class BelongsTo \n class MorphTo<\/code><\/pre>\n\u4f46\u662f\uff0c\u81f3\u4e8e Laravel \u4e2d\u4e3a\u4ec0\u4e48\u4f1a\u8fd9\u6837\u505a\uff0c\u6682\u65f6\u4e0d\u592a\u6e05\u695a\uff0c\u6ca1\u6709\u627e\u5230\u76f8\u5173\u8d44\u6599\u3002<\/p>\n
\u503c\u5f97\u4e00\u63d0\u7684\u662f\uff0c\u5728 Laravel 5.4 \u4e4b\u524d\uff0c\u786e\u5b9e\u6709\u8fc7\u7c7b\u4f3c\u7684\u7528\u6cd5\uff0c\u6b64\u540e\u90fd\u88ab\u53d6\u4ee3\u4e86\u3002<\/p>\n
<\/p>\n
\n- Cleaning up morphTo relationship. \u00b7 laravel\/framework@3cf7f17<\/a><\/li>\n<\/ul>\n
\u5176\u5b9e\u4ece\u4e0a\u9762\u7684 PR \u4e2d\u4e0d\u96be\u770b\u5230\uff0c\u4e00\u5f00\u59cb morphInstanceTo<\/code> \u91cc\u9762\u4e5f\u662f\u4f7f\u7528\u7684 Model<\/code> \u8fdb\u884c\u8c03\u7528\u3002<\/p>\n<\/p>\n
\u53ea\u662f\u5728\u968f\u540e\u7684\u4e00\u4e2a PR<\/a> \u4e2d\uff0c\u6709\u4eba\u8d21\u732e\u4e86\u4e00\u6b21\uff0c\u5e76\u4e14\u628a\u8fd9\u91cc\u6539\u6210\u4e86 static<\/code> \u8c03\u7528\uff0c\u5e76\u4e14\u539f\u56e0\u4e5f\u662f\u8fd9\u4e2a\u8d21\u732e\u8005\u5e0c\u671b\u4f7f\u7528\u6570\u5b57\u6765\u4e3a\u6bcf\u4e2a\u6a21\u578b\u5b9a\u4e49\u6620\u5c04\uff0c\u8fd9\u4e2a PR \u4e5f\u662f\u88ab\u5408\u5e76\u4e86\uff0c\u4e5f\u5c31\u8fbe\u5230\u4e86\u73b0\u5728\u7684\u6837\u5b50\uff0c\u4f46\u662f\u5bf9\u4e8e createModelByType<\/code> \u91cc\u9762\u7684\u8c03\u7528\uff0c\u8fd9\u4f4d\u8d21\u732e\u8005\u4e5f\u63d0\u4ea4\u4e86 PR<\/a>\uff0c\u4f46\u662f\u8fd9\u4e2a PR \u56e0\u4e3a Travis \u7684\u6d4b\u8bd5\u5931\u8d25\u4e86\uff0c\u56e0\u4e3a\u4ed6\u8fd9\u91cc\u662f\u76f4\u63a5\u7c97\u66b4\u7684\u8c03\u7528\u4e86 static<\/code>\uff0c\u524d\u9762\u8bf4\u8fc7\uff0c\u8fd9\u91cc\u7684 static \u5b9e\u9645\u4e0a\u662f\u6307\u5411\u4e86 MorphTo\uff0c\u6240\u4ee5\u81ea\u7136\u662f\u884c\u4e0d\u901a\u7684\uff0c\u4e14\u4f5c\u8005\u6ca1\u6709\u53ca\u65f6\u7ef4\u62a4\uff0c\u88ab\u5173\u95ed\u4e86\uff0c\u81f3\u6b64\u5c31\u9057\u7559\u81f3\u4eca \ud83e\udee5<\/p>\n\n- 5.4 Allow getActualClassNameForMorph() used by createModelByType() to be overridden by masterwto \u00b7 Pull Request #18099 \u00b7 laravel\/framework<\/a><\/li>\n
- 5.4 Update HasRelations::morphInstanceTo() by masterwto \u00b7 Pull Request #18058 \u00b7 laravel\/framework<\/a><\/li>\n<\/ul>\n
\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u6253\u5f00 MorphTo::createModelByType \uff0c\u4fee\u6539 Model \u4e3a parent<\/p>\n
public function createModelByType($type)\n {\n- $class = Model::getActualClassNameForMorph($type);\n+ $class = $this->parent::getActualClassNameForMorph($type);\n\n return tap(new $class, function ($instance) {\n if (! $instance->getConnectionName()) {\n $instance->setConnection($this->getConnection()->getName());\n }\n });\n }<\/code><\/pre>\nok\uff0c\u8fd4\u56de\u6211\u4eec\u7684\u4ee3\u7801\uff0c\u4f60\u5c31\u53ef\u4ee5\u53d1\u73b0 load \u548c with \u90fd\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\u4e86\u3002<\/p>\n
\u4f46\u662f\uff0c\u8fd9\u5c31\u591f\u4e86\u5417\uff1f<\/p>\n
\u5982\u679c\u4f60\u7684\u8868\u4e2d\u53ea\u6709\u4e00\u4e2a\u8fd9\u6837\u7684\u591a\u6001\u5173\u8054\u5173\u7cfb\uff0c\u8fd9\u5c31\u591f\u4e86\uff0c\u5982\u679c\u4f60\u6709\u591a\u4e2a\uff0c\u8fd9\u53ef\u80fd\u4f1a\u4e0d\u591f\uff0c\u56e0\u4e3a\uff0cgetActualClassNameForMorph \u8fd9\u91cc\u867d\u7136\u662f\u4f20\u5165\u7684 type\uff0c\u4f46\u662f\u4ed6\u5e76\u6ca1\u6709\u544a\u8bc9\u4f60\uff0c\u8fd9\u662f\u6765\u81ea\u54ea\u4e00\u4e2a\u5b57\u6bb5\uff0c\u8fd9\u5728\u9884\u52a0\u8f7d(with\/load) \u7684\u65f6\u5019\u53d8\u5f97\u6781\u4e3a\u56f0\u96be\u3002<\/p>\n
\u5f53\u7136\uff0c\u66f4\u91cd\u8981\u7684\u662f\u76ee\u524d\u8fd9\u4e2a\u8fd8\u662f\u8981\u4f60\u53bb\u6539\u6838\u5fc3\u7684\u4ee3\u7801\u6216\u8005\u901a\u8fc7\u5176\u4ed6\u65b9\u5f0f\u6539\u6838\u5fc3\u7684\u4ee3\u7801\uff0c\u6709\u4e9b\u96be\u4ee5\u8fbe\u5230\u3002<\/p>\n
\u9677\u5165\u50f5\u5c40<\/h3>\n
\u5176\u5b9e\u5728\u51e0\u5e74\u524d\u6211\u4e5f\u5904\u7406\u8fc7\u8fd9\u4e2a\u95ee\u9898\u5f53\u7136\u662f\u8fd8\u5728\u7528 Laravel 5.4 \u7248\u672c\uff0c\u5f53\u65f6\u6839\u636e\u4e00\u901a\u8c03\u8bd5\u540e\uff0c\u786e\u5b9a\u4e86 Laravel \u5185\u90e8\u5728\u8bbf\u95ee\u5173\u8054\u5b57\u6bb5\u7684\u65f6\u5019\uff0c\u5176\u5b9e\u662f\u4f1a\u901a\u8fc7\u8bbf\u95ee\u5668\u7684 get*Attribute<\/code>\uff0c\u6240\u4ee5\u5f53\u65f6\u7684\u89e3\u51b3\u65b9\u6848\u5c31\u662f\uff0c\u521b\u5efa\u4e86\u4e00\u4e2a getCommentableTypeAttribute<\/code> \u8fd9\u6837\u7684 \u8bbf\u95ee\u5668\u3002<\/p>\n public function commentableType(): Attribute\n {\n return Attribute::get(fn($value) => match ((int) $value) {\n 1 => Post::class,\n 2 => Video::class,\n default => $value,\n });\n }\n<\/code><\/pre>\n\u597d\u50cf\u786e\u5b9e\u53ef\u4ee5\uff0cwith\/load \u90fd\u5de5\u4f5c\u4e86\u3002<\/p>\n
\u4f46\u662f\uff0c\u5f53\u6211\u4eec\u4e0d\u9002\u7528 with\/load \u65f6\uff0c\u76f4\u63a5\u8bbf\u95ee\u672a\u52a0\u8f7d\u7684\u5173\u7cfb\u5c5e\u6027\uff08commentable\uff09\u65f6\uff0c\u4f60\u5c31\u4f1a\u53d1\u73b0\uff0c\u53c8\u51fa\u9519\u4e86\uff0c\u8fd9\u6b21\u5f97\u5230\u7684\u65f6 Class "1" not found<\/code> \u8fd9\u6837\u7684\u9519\u8bef\u3002<\/p>\nWhat\uff1f<\/p>\n
\u5176\u5b9e\u554a\uff0c\u8fd9\u662f\u5728 HasRelationships::morphTo<\/code> \u8fd9\u4e2a\u65b9\u6cd5\u7684 return \u90a3\u91cc\uff0c\u6709\u4e00\u4e2a\u5224\u65ad\uff0c\u5176\u4e3b\u8981\u76ee\u7684\u662f\uff0c\u4f7f\u7528 getAttributeFromArray<\/code> \u83b7\u53d6\u6a21\u578b\u7684 $attributes<\/code> \u5c5e\u6027\uff0c\u5e76\u4e14\u8fd4\u56de\u6307\u5b9a key \u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u4ed6\u8fd9\u91cc\u5b9e\u9645\u4e0a\u65f6\u76f4\u63a5\u8bbf\u95ee\u7684 attributes \u7684\u503c\uff0c\u5e76\u4e0d\u4f1a\u7ecf\u8fc7\u4efb\u4f55\u7684\u8bbf\u95ee\u5668\u2026\u2026\uff0c\u81ea\u7136\u5c31\u6ca1\u6cd5\u4f7f\u7528\u3002<\/p>\n public function morphTo($name = null, $type = null, $id = null, $ownerKey = null)\n {\n \/\/ If no name is provided, we will use the backtrace to get the function name\n \/\/ since that is most likely the name of the polymorphic interface. We can\n \/\/ use that to get both the class and foreign key that will be utilized.\n $name = $name ?: $this->guessBelongsToRelation();\n\n [$type, $id] = $this->getMorphs(\n Str::snake($name), $type, $id\n );\n\n \/\/ If the type value is null it is probably safe to assume we're eager loading\n \/\/ the relationship. In this case we'll just pass in a dummy query where we\n \/\/ need to remove any eager loads that may already be defined on a model.\n return is_null($class = $this->getAttributeFromArray($type)) || $class === ''\n ? $this->morphEagerTo($name, $type, $id, $ownerKey)\n : $this->morphInstanceTo($class, $name, $type, $id, $ownerKey);\n }\n<\/code><\/pre>\n\u4e0d\u8fc7\uff0c\u6ce8\u610f\u540e\u9762\u7684\u5224\u65ad\uff0c\u5982\u679c attributes \u6709\u8fd9\u4e2a\u5b57\u6bb5\uff0c\u5c31\u4f1a\u8c03\u7528 morphEagerTo<\/code>\uff0c\u53cd\u4e4b\u8c03\u7528\u540e\u9762\u7684 morphInstanceTo<\/code>\uff0c\u5176\u5b9e\u8fd9\u91cc\u7684\u6ce8\u91ca\u5c31\u5199\u7684\u5f88\u660e\u767d\uff0c\u5982\u679c\u6b64\u65f6\u4ece attributes \u4e0a\u83b7\u53d6\u7684 type \u4e3a\u7a7a\uff0c\u90a3\u4e48\u5c31\u6709\u53ef\u80fd\u6211\u4eec\u5176\u5b9e\u662f\u5728\u4f7f\u7528 with(\u56e0\u4e3a\u8fd9\u65f6\u5019\u67e5\u8be2\u5e76\u6ca1\u6709\u7ed3\u675f\uff0c\u6240\u4ee5\u8fd4\u56de\u4e86 morphEagerTo<\/code>)\uff0c\u800c\u73b0\u5728\u8fd9\u91cc\u662f\u6709\u503c\u7684\uff0c\u4e5f\u5c31\u662f\u6570\u636e\u5e93\u91cc\u9762\u4fdd\u5b58\u7684 1\/2\uff0c\u4e0d\u8fc7\uff0c\u522b\u5fd8\u4e86\uff0c\u4e0a\u9762\u63d0\u5230\u7684\u4f17\u591a getActualClassNameForMorph<\/code> \u8c03\u7528\u8005\u4e2d\uff0c\u5c31\u6709\u8fd9\u4e2a morphInstanceTo<\/code>,\u662f\u7684\uff0c\u6ca1\u9519\u3002\u3002\u3002\u6211\u4eec\u8fd8\u53ef\u80fd\u9700\u8981\u91cd\u5199 getActualClassNameForMorph<\/code> \u65b9\u6cd5\u6765\u5e94\u5bf9\u6ca1\u6709\u9884\u52a0\u8f7d\u7684\u60c5\u51b5\u3002<\/p>\n\u73b0\u5728\u52a0\u4e0a\u4e4b\u524d\u7684 getActualClassNameForMorph<\/code> \u5b9e\u73b0\uff0c\u5c31\u6210\u4e86\u4e0b\u9762\u8fd9\u6837<\/p>\npublic function commentable(): MorphTo\n{\n return $this->morphTo();\n} \n\npublic static function getActualClassNameForMorph($class)\n{\n return match ((int) $class) {\n 1 => Post::class,\n 2 => Video::class,\n default => parent::getActualClassNameForMorph($class),\n };\n}\n\npublic function commentableType(): Attribute\n{\n return Attribute::get(fn($value) => match ((int) $value) {\n 1 => Post::class,\n 2 => Video::class,\n default => $value,\n });\n}\n<\/code><\/pre>\n\u4f60\u8fd8\u53ef\u4ee5\u4f7f\u7528\u65e7\u7248\u7684 get*Attribute<\/code> \u65b9\u6cd5\u3002<\/p>\npublic function commentable(): MorphTo\n{\n return $this->morphTo();\n} \n\npublic static function getActualClassNameForMorph($class)\n{\n return match ((int) $class) {\n 1 => Post::class,\n 2 => Video::class,\n default => parent::getActualClassNameForMorph($class),\n };\n}\n\npublic function getCommentableTypeAttribute($value)\n{\n return match ((int) $value) {\n 1 => Post::class,\n 2 => Video::class,\n default => $value,\n };\n}\n<\/code><\/pre>\n\u73b0\u5728\uff0c\u5237\u65b0\u9875\u9762\uff0c\u4f60\u4f1a\u53d1\u73b0\u57fa\u672c\u5df2\u7ecf\u5b8c\u7f8e\u4e86\uff0c\u6211\u4eec\u6ca1\u6709\u6539\u53d8\u4efb\u4f55 Laravel \u5185\u90e8\u7684\u4ee3\u7801\uff0c\u53ea\u662f\u6539\u53d8\u4e86\u6211\u4eec\u7684\u6a21\u578b\u3002<\/p>\n
\u73b0\u5728\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee commentable \uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528 with\/load<\/p>\n
\u5230\u6b64\u5c31\u5b8c\u7f8e\u4e86\u5417\uff1f<\/p>\n
\u4e0d\uff0c\u5e76\u6ca1\u6709<\/p>\n
\u4ed4\u7ec6\u89c2\u5bdf\uff0c\u4f60\u4f1a\u53d1\u73b0\u4e0a\u9762\u8fd9\u4e2a\u65b9\u6848\u8fd8\u5b58\u5728\u4e00\u4e2a\u5c0f\u5c0f\u7684\u95ee\u9898\uff0c\u90a3\u5c31\u662f\u6211\u4eec\u5fc5\u987b\u8981\u8986\u76d6 commentable_type \u7684\u8bfb\u51fa\u5b57\u6bb5\uff0c\u8fd9\u6837\u6211\u4eec\u5982\u679c\u9700\u8981\u5728\u63a5\u53e3\u8fd4\u56de\u65f6\uff0c\u5c31\u4f1a\u663e\u793a\u6210\u6211\u4eec\u8f6c\u6362\u540e\u7684\u7c7b\u540d\u4e86\uff0c\u800c\u4e0d\u662f\u539f\u59cb\u7684 1\/2\uff0c\u90a3\u4e48\u6709\u6ca1\u6709\u529e\u6cd5\u5462\uff0c\u5176\u5b9e\u662f\u6709\u7684\uff0c\u90a3\u5c31\u662f\u518d\u65b0\u5efa\u4e00\u4e2a commentTypeRef \u7684\u5b57\u6bb5\uff0c\u5728\u8fd9\u91cc\u9762\u8fd4\u56de\u539f\u59cb\u503c\uff0c\u73b0\u5728\u4f60\u7684 Comment \u6a21\u578b\u5e94\u8be5\u5c31\u4f1a\u50cf\u4e0b\u9762\u8fd9\u6837\u3002<\/p>\n
<?php\n\nnamespace App\/Models;\n\nuse Illuminate\/Database\/Eloquent\/Casts\/Attribute;\nuse Illuminate\/Database\/Eloquent\/Factories\/HasFactory;\nuse Illuminate\/Database\/Eloquent\/Model;\nuse Illuminate\/Database\/Eloquent\/Relations\/MorphTo;\n\nclass Comment extends Model\n{\n use HasFactory;\n\n protected $appends = ['commentable_type_ref'];\n\n public static function getActualClassNameForMorph($class)\n {\n return match ((int) $class) {\n 1 => Post::class,\n 2 => Video::class,\n default => parent::getActualClassNameForMorph($class),\n };\n }\n\n public function commentable(): MorphTo\n {\n return $this->morphTo();\n }\n\n public function commentableType(): Attribute\n {\n return Attribute::get(fn($value) => match ((int) $value) {\n 1 => Post::class,\n 2 => Video::class,\n default => $value,\n });\n }\n\n public function commentableTypeRef(): Attribute\n {\n return Attribute::get(fn() => (int) $this->attributes['commentable_type']);\n }\n\n\n}\n<\/code><\/pre>\n\u73b0\u5728\u63a5\u53e3\u4f1a\u8fd4\u56de\u4e00\u4e2a commentable_type_ref<\/code> \u5b57\u6bb5\uff0c\u6211\u8fd9\u91cc\u5077\u61d2\u4e86\uff0c\u76f4\u63a5\u8f6c\u4e3a int \u4e86\u3002<\/p>\n\u5f88\u597d\uff0c\u4f46\u7f8e\u4e2d\u4e0d\u8db3\uff0c\u95ee\u9898\u867d\u7136\u89e3\u51b3\u4e86\uff0c\u4f46\u662f\u524d\u7aef\u539f\u6765\u7528\u6765\u5224\u65ad\u7684\u5b57\u6bb5\u53d8\u4e86\uff0c\u4e0d\u8fc7\u8fd9\u4e5f\u65e0\u4f24\u5927\u96c5\uff0c\u8ddf\u524d\u7aef\u53cb\u597d\u6c9f\u901a\u4e00\u4e0b\u5c31\u597d\u4e86\u3002<\/p>\n
\u5982\u679c\u4f60\u60f3\u66f4\u8fdb\u4e00\u6b65\uff0c\u90a3\u4e0d\u59a8\u7ee7\u7eed\u770b\u770b\u3002<\/p>\n
\u66f4\u8fdb\u4e00\u6b65<\/h3>\n
\u5728\u4e0a\u9762\u7684\u5185\u5bb9\u4e2d\uff0c\u6211\u4eec\u57fa\u672c\u5df2\u7ecf\u89e3\u51b3\u4e86\u6211\u4eec\u7684\u9700\u6c42\uff0c\u53ea\u662f\u6709\u4e00\u4e9b\u5c0f\u7455\u75b5\u3002<\/p>\n
\u73b0\u5728\u6765\u601d\u8003\u4e00\u4e2a\u95ee\u9898\uff0c\u5728\u6211\u4eec\u521b\u5efa\u6a21\u578b\u5173\u8054\u7684\u65f6\u5019\uff0c\u4f7f\u7528\u5230\u7684\u5b57\u6bb5\uff0c\u662f\u5fc5\u987b\u8981\u6570\u636e\u5e93\u4e2d\u5b58\u5728\u7684\u5417\uff1f<\/p>\n
<?php\n\nnamespace App\/Models;\n\nuse Illuminate\/Database\/Eloquent\/Casts\/Attribute;\nuse Illuminate\/Database\/Eloquent\/Factories\/HasFactory;\nuse Illuminate\/Database\/Eloquent\/Model;\nuse Illuminate\/Database\/Eloquent\/Relations\/BelongsTo;\nuse Illuminate\/Database\/Eloquent\/Relations\/MorphMany;\n\nclass Post extends Model\n{\n use HasFactory;\n\n public function comments(): MorphMany\n {\n return $this->morphMany(Comment::class, 'commentable');\n }\n\n public function user(): BelongsTo\n {\n return $this->belongsTo(User::class, 'user_id');\n }\n\n public function userId(): Attribute\n {\n return Attribute::get(fn() => $this->id);\n }\n}\n<\/code><\/pre>\n\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u4e3a Post \u6a21\u578b\u521b\u5efa\u4e86\u4e00\u4e2a user \u7684\u5173\u7cfb\uff0c\u5982\u679c\u4f60\u67e5\u770b\u6700\u521d\u7684\u8868\u5b9a\u4e49\u4ee3\u7801\uff0c\u4f60\u4f1a\u53d1\u73b0\uff0cposts \u8868\u91cc\u9762\u5e76\u6ca1\u6709 user_id \u8fd9\u4e2a\u5b57\u6bb5\uff0c\u800c\u6211\u5374\u5728\u4e0b\u9762\u4f7f\u7528\u83b7\u53d6\u5176\u521b\u5efa\u4e86\u4e00\u4e2a user_id \u5b57\u6bb5\uff0c\u90a3\u8fd9\u6837\u80fd\u884c\u5417\uff1f<\/p>\n
\u7b54\u6848\u662f\u53ef\u884c\u7684\u3002<\/p>\n
Route::get('\/', function () {\n- $comments = \/App\/Models\/Comment::limit(5)->get();\n-\n- $comments->load('commentable');\n- $comment = $comments->first();\n- $commentable = $comment->commentable;\n-\n- return $comments;\n-\n+ \n+ $post = \/App\/Models\/Post::with('user')->first();\n+\n+ return $post;\n});\n<\/code><\/pre>\n{\n "id": 1,\n "title": "voluptatibus",\n "content": "fugit",\n "created_at": "2024-11-29T15:44:42.000000Z",\n "updated_at": "2024-11-29T15:44:42.000000Z",\n "user": {\n "id": 1,\n "name": "Test User",\n "email": "test@example.com",\n "email_verified_at": "2024-12-01T03:53:24.000000Z",\n "created_at": "2024-12-01T03:53:24.000000Z",\n "updated_at": "2024-12-01T03:53:24.000000Z"\n }\n}<\/code><\/pre>\n\u6ca1\u9519\uff0c\u5b83\u53ef\u4ee5\u6b63\u786e\u7684\u52a0\u8f7d\u51fa user \u6765\uff0c\u5e76\u4e14\u8fd8\u53ef\u4ee5\u4f7f\u7528 with\/load \u548c\u76f4\u63a5\u8bbf\u95ee\u3002<\/p>\n
\u6709\u6ca1\u6709\u4e00\u70b9\u70b9\u7684\u60ca\u8bb6\uff0c\u8fd9\u4fbf\u662f\u89e3\u51b3\u524d\u9762\u8fd9\u4e2a\u95ee\u9898\u7684\u6240\u5728\u3002<\/p>\n
\u73b0\u5728\uff0c \u56de\u5230 Comment \u6a21\u578b\uff0c\u628a\u539f\u672c commentable \u91cc\u9762\u7684 morphTo \u53c2\u6570\u5b8c\u5584\u4e00\u4e0b,\uff0c\u540c\u65f6\u6e05\u7406\u6389\u4e0d\u518d\u9700\u8981\u7684 commentable_type_ref \u5427\uff0c\u73b0\u5728\u8ba9\u6211\u4eec\u7528\u56de\u4e4b\u524d\u7684\u6d4b\u8bd5\u4ee3\u7801\u3002<\/p>\n
-protected $appends = ['commentable_type_ref'];\n\n...\n\npublic function commentable(): MorphTo\n{\n- return $this->morphTo();\n+ return $this->morphTo('commentable', 'commentable_type_class', 'commentable_id', 'id');\n}\n\n-public function commentableType(): Attribute\n+public function commentableTypeClass(): Attribute\n{\n- return Attribute::get(fn($value) => match ((int) $value) {\n+ return Attribute::get(fn() => match ((int) $this->commentable_type) {\n 1 => Post::class,\n 2 => Video::class,\n- default => $value,\n+ default => $this->commentable_type,\n });\n}\n\n\n-public function commentableTypeRef(): Attribute\n-{\n- return Attribute::get(fn() => (int) $this->attributes['commentable_type']);\n-}\n\n<\/code><\/pre>\n\u5f97\u5230\u7ed3\u679c<\/p>\n
[\n {\n "id": 1,\n "commentable_type": "1",\n "commentable_id": 5,\n "body": "iste",\n "created_at": "2024-11-29T15:48:28.000000Z",\n "updated_at": "2024-11-29T15:48:28.000000Z",\n "commentable": {\n "id": 5,\n "title": "sunt",\n "content": "numquam",\n "created_at": "2024-11-29T15:48:28.000000Z",\n "updated_at": "2024-11-29T15:48:28.000000Z"\n }\n }\n]<\/code><\/pre>\n\u73b0\u5728\uff0c\u5b8c\u7f8e\u4e86\u6ca1\uff1f\u6211\u53ea\u60f3\u8bf4\uff0c \u8fd8\u5dee\u4e00\u70b9\u70b9~<\/p>\n
\u4e3a\u4e86\u540e\u9762\u7684\u6b65\u9aa4\u66f4\u6e05\u6670\uff0c\u6211\u5148\u6765\u88c5\u4e00\u4e2a laravel-debugger<\/code><\/p>\ncomposer require barryvdh\/laravel-debugbar --dev<\/code><\/pre>\n\u522b\u5fd8\u4e86\u5728 .env<\/code> \u4e2d\u6dfb\u52a0\u914d\u7f6e\u9879\u4ee5\u542f\u7528<\/p>\nDEBUGBAR_ENABLED=true<\/code><\/pre>\n\u55f7\uff0c\u73b0\u5728\u4f60\u8bbf\u95ee\u63a5\u53e3\u5e94\u8be5\u4e0d\u4f1a\u770b\u5230 laravel-debugger\uff0c\u8fd9\u662f\u56e0\u4e3a\u4ed6\u4e0d\u4f1a\u5bf9 JSON \u54cd\u5e94\u751f\u6548\uff0c\u5982\u679c\u60f3\u8981\u770b\u5230\uff0c\u53ef\u4ee5\u968f\u4fbf\u8bbf\u95ee\u4e00\u4e2a 404 \u9875\u9762\uff0c\u7136\u540e\u5c31\u80fd\u770b\u5230\u90a3\u4e2a\u719f\u6089\u7684 icon \u4e86\uff0c\u7136\u540e\u70b9\u51fb icon\uff0c\u518d\u70b9\u51fb\u53f3\u4e0a\u89d2\u7684\u4ece\u53f3\u81f3\u5de6\u7b2c\u4e09\u4e2a\u56fe\u6807\uff08\u6253\u5f00\u6587\u4ef6\uff09\uff0c\u9009\u62e9\u5176\u4ed6\u9875\u9762\u7684\u8bf7\u6c42\u3002<\/p>\n
<\/p>\n
\u73b0\u5728\uff0c\u628a\u6211\u4eec\u7684\u6d4b\u8bd5\u4ee3\u7801\u6539\u6210\u4e0b\u9762\u8fd9\u6837<\/p>\n
Route::get('\/', function () {\n $comments = \/App\/Models\/Comment::limit(1)->get();\n $comment = $comments->first();\n\n return $comment->commentable;\n});<\/code><\/pre>\n\u7136\u540e\u4f60\u5c31\u5f97\u5230\u4e86\u7ed3\u679c<\/p>\n
{\n "id": 5,\n "commentable_type": "1",\n "commentable_id": 5,\n "body": "reprehenderit",\n "created_at": "2024-11-29T15:48:28.000000Z",\n "updated_at": "2024-11-29T15:48:28.000000Z"\n}<\/code><\/pre>\n\u662f\u7684\uff0c\u4f60\u6ca1\u6709\u770b\u9519\u2026\u2026\uff0c\u8fd9\u91cc\u660e\u660e\u8fd4\u56de\u7684\u662f commentable\uff0c\u4e5f\u5c31\u662f\u539f\u672c\u5e94\u8be5\u8fd4\u56de Post \u6216\u8005 Video \u7684\uff0c\u8fd9\u91cc\u5374\u8c8c\u4f3c\u8fd4\u56de\u4e86 comments.id = 5 \u7684\u6570\u636e\uff0c\u6709\u4e9b\u79bb\u8c31\u5427\u3002\u3002\u3002<\/p>\n
<\/p>\n
\u8fd8\u8bb0\u5f97\u6211\u4eec\u524d\u9762\u63d0\u5230\u7684 morphTo<\/code> \u65b9\u6cd5\u5417\uff1f\u8fd9\u91cc\u4e5f\u4f1a\u8d70\u5230\u7684\u5594\uff0c\u4ed6\u4f1a\u4f7f\u7528 getAttributeFromArray<\/code> \u6765\u83b7\u53d6 $attributes<\/code> \u5c5e\u6027\u4e0a\u7684\u5b57\u6bb5\u6765\u5224\u65ad\uff08\u5728\u8fd9\u91cc\u7406\u8bba\u4e0a\u662f\u6570\u636e\u5e93\u4e2d\u7684\u5b57\u6bb5\uff09\uff0c\u5982\u679c\u83b7\u53d6\u5230\u4e86\uff0c\u4ed6\u4f1a\u8c03\u7528 morphInstanceTo<\/code>\uff0c\u53cd\u4e4b\u4ed6\u5219\u8ba4\u4e3a\u8fd9\u662f\u4e00\u4e2a\u6765\u81ea with<\/code>\u7684\u8c03\u7528\uff0c\u7ee7\u800c\u8c03\u7528 morphEagerTo<\/code><\/p>\n\u800c\u6211\u4eec\u8fd9\u91cc\u7684 commentable_type_class<\/code> \u5176\u5b9e\u662f\u865a\u6784\u800c\u6765\u7684\uff0c\u5b83\u5e76\u4e0d\u5b58\u5728\u4e8e\u6570\u636e\u5e93\u4e2d\u7684\u771f\u5b9e\u5b57\u6bb5\uff0c\u81ea\u7136\uff0c\u8fd9\u91cc\u83b7\u53d6\u51fa\u6765\u7684\u5c31\u6210\u4e86\u7a7a\uff0c\u8fdb\u5165\u4e86\u9884\u52a0\u8f7d\u7684\u903b\u8f91\uff0c\u800c\u5b9e\u9645\u4e0a\u6211\u4eec\u5176\u5b9e\u662f\u5728\u76f4\u63a5\u8bbf\u95ee\u672a\u9884\u52a0\u8f7d\u7684\u6570\u636e\uff0c\u5c31\u5bfc\u81f4\u4e86\u8fd9\u4e2a\u9519\u8bef\u3002<\/p>\n\u5982\u4f55\u4fee\u590d\u8fd9\u4e2a\u95ee\u9898\uff1f\u65e2\u7136\uff0c\u6211\u4eec\u9700\u8981\u7ed9\u6570\u636e\u5e93\u8fd4\u56de\u7684\u7ed3\u679c\u6dfb\u52a0\u4e00\u4e2a\u5b57\u6bb5\uff0c\u90a3\u5728 select \u7684\u65f6\u5019\uff0c\u5904\u7406\u4e00\u4e0b\u4e0d\u5c31\u597d\u4e86\u5417\uff1f<\/p>\n
Route::get('\/', function () {\n $comments = \/App\/Models\/Comment::select(['*', DB::raw("CASE\n WHEN commentable_type = 1 THEN '\/\/App\/\/Models\/\/Post'\n WHEN commentable_type = 2 THEN '\/\/App\/\/Models\/\/Video'\n ELSE commentable_type\n END AS commentable_type_class")])->limit(1)->get();\n $comment = $comments->first();\n\n return $comment->commentable;\n});\n<\/code><\/pre>\n\u786e\u5b9e\uff0c\u6211\u4eec\u901a\u8fc7\u8fd9\u6837\u89e3\u51b3\u4e86\u524d\u9762\u7684 bug\uff0c\u5b9e\u73b0\u6211\u4eec\u7684\u9700\u6c42\uff0c\u53ea\u662f\u4ee3\u7801\u770b\u8d77\u6765\u6709\u4ebf\u70b9\u70b9\u7cdf\u7cd5 \ud83e\udd14<\/p>\n
\u4ec0\u4e48\uff1f\u8fd8\u6709\u9ad8\u624b\uff01<\/p>\n
\u6700\u7ec8\u65b9\u6848<\/h3>\n
\u5176\u5b9e\u53c2\u8003\u524d\u9762\u7684\u5185\u5bb9\u4e0d\u96be\u53d1\u73b0\uff0c\u6211\u4eec\u524d\u9762\u90fd\u5b8c\u6210\u4e86\uff0c\u53ea\u662f\uff0c\u5728\u6700\u540e\u4e00\u90e8\uff0c\u9700\u8981\u5411 $attributes<\/code> \u6dfb\u52a0\u5b57\u6bb5\u8fd9\u91cc\u5361\u4f4f\u4e86\uff0c\u90a3\u4e48\uff0c\u6709\u6ca1\u6709\u4ec0\u4e48\u65b9\u6cd5\uff0c\u53ef\u4ee5\u8ba9\u6211\u4eec\u5728 $attributes<\/code> \u4e0a\u6dfb\u52a0\u5b57\u6bb5\u5462\uff0c\u7b54\u6848\u662f\u6709\u7684\u3002<\/p>\n\u4f60\u53ef\u80fd\u4f1a\u60f3\u5230\uff0c\u5982\u679c\u53ea\u662f\u5f80\u4e0a\u9762\u6dfb\u52a0\u4e00\u4e2a\u5b57\u6bb5\uff0c\u90a3\u76f4\u63a5\u8986\u76d6\u6a21\u578b\u7684 boot \u65b9\u6cd5\u7136\u540e\u7ed9 $attributes<\/code> \u8ffd\u52a0\u4e00\u4e2a\u4e0d\u5c31\u597d\u4e86\u3002<\/p>\n\u4f46\u662f\uff0c\u90a3\u8fd8\u662f\u53ef\u80fd\u4f1a\u5f71\u54cd\u5230\u4e0a\u9762\u7684 morphTo \u65b9\u6cd5\uff0c\u6240\u4ee5\uff0c\u6211\u4eec\u7684\u6700\u7ec8\u76ee\u7684\u662f\uff0c\u8981\u627e\u5230\u4e00\u4e2a\u5408\u9002\u7684\u65f6\u673a\u53bb\u6dfb\u52a0\uff0c\u5e76\u4e14\u8fd8\u8981\u5c3d\u53ef\u80fd\u7684\u8003\u8651\u53ef\u80fd\u5e26\u6765\u7684\u5176\u4ed6\u95ee\u9898\u3002<\/p>\n
\u800c Laravel \u7684\u6a21\u578b\u4e2d\u6070\u597d\u6709\u8fd9\u4e00\u7c7b\u4e0d\u540c\u65f6\u673a\u8c03\u7528\u7684\u65b9\u6cd5\uff0c\u90a3\u5c31\u662f\u6a21\u578b\u4e8b\u4ef6\u3002<\/p>\n
\u9009\u62e9\u4e00\u4e2a\u5408\u9002\u7684\u6a21\u578b\u4e8b\u4ef6<\/h4>\n
\u6253\u5f00 Laravel \u6587\u6863\uff0c\u53ef\u4ee5\u770b\u5230\u6a21\u578b\u6709\u4ee5\u4e0b\u4e8b\u4ef6\u3002<\/p>\n
\n\n\n\u4e8b\u4ef6\u540d\u79f0<\/th>\n \u89e6\u53d1\u65f6\u673a<\/th>\n<\/tr>\n<\/thead>\n \n\nretrieved<\/code><\/td>\n\u5f53\u6a21\u578b\u5b9e\u4f8b\u4ece\u6570\u636e\u5e93\u4e2d\u68c0\u7d22\u51fa\u6765\u65f6\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \ncreating<\/code><\/td>\n\u5728\u4fdd\u5b58\u6a21\u578b\u4e4b\u524d\u89e6\u53d1\uff08\u521b\u5efa\u65b0\u8bb0\u5f55\uff09\u3002<\/td>\n<\/tr>\n \ncreated<\/code><\/td>\n\u5728\u6a21\u578b\u6210\u529f\u4fdd\u5b58\u5230\u6570\u636e\u5e93\u540e\u89e6\u53d1\uff08\u65b0\u8bb0\u5f55\uff09\u3002<\/td>\n<\/tr>\n \nupdating<\/code><\/td>\n\u5728\u66f4\u65b0\u73b0\u6709\u6a21\u578b\u65f6\uff0c\u6570\u636e\u88ab\u63d0\u4ea4\u5230\u6570\u636e\u5e93\u4e4b\u524d\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \nupdated<\/code><\/td>\n\u5728\u6a21\u578b\u6210\u529f\u66f4\u65b0\u540e\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \nsaving<\/code><\/td>\n\u5728\u4fdd\u5b58\u6a21\u578b\u4e4b\u524d\u89e6\u53d1\uff08\u5305\u62ec\u521b\u5efa\u548c\u66f4\u65b0\uff09\u3002<\/td>\n<\/tr>\n \nsaved<\/code><\/td>\n\u5728\u6a21\u578b\u6210\u529f\u4fdd\u5b58\u540e\u89e6\u53d1\uff08\u5305\u62ec\u521b\u5efa\u548c\u66f4\u65b0\uff09\u3002<\/td>\n<\/tr>\n \ndeleting<\/code><\/td>\n\u5728\u5220\u9664\u6a21\u578b\u4e4b\u524d\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \ndeleted<\/code><\/td>\n\u5728\u6a21\u578b\u6210\u529f\u5220\u9664\u540e\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \ntrashed<\/code><\/td>\n\u5f53\u6a21\u578b\u88ab\u8f6f\u5220\u9664\uff08\u5373 delete()<\/code>\uff09\u65f6\u89e6\u53d1\u3002<\/td>\n<\/tr>\n\nforceDeleting<\/code><\/td>\n\u5728\u5f3a\u5236\u5220\u9664\uff08\u5373 forceDelete()<\/code>\uff09\u4e4b\u524d\u89e6\u53d1\uff08\u8df3\u8fc7\u8f6f\u5220\u9664\uff09\u3002<\/td>\n<\/tr>\n\nforceDeleted<\/code><\/td>\n\u5728\u5f3a\u5236\u5220\u9664\u540e\u89e6\u53d1\uff08\u8df3\u8fc7\u8f6f\u5220\u9664\uff09\u3002<\/td>\n<\/tr>\n \nrestoring<\/code><\/td>\n\u5728\u6062\u590d\u8f6f\u5220\u9664\u7684\u6a21\u578b\u65f6\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \nrestored<\/code><\/td>\n\u5728\u6062\u590d\u8f6f\u5220\u9664\u7684\u6a21\u578b\u6210\u529f\u540e\u89e6\u53d1\u3002<\/td>\n<\/tr>\n \nreplicating<\/code><\/td>\n\u5728\u590d\u5236\u6a21\u578b\u5b9e\u4f8b\uff08\u4f7f\u7528 replicate()<\/code>\uff09\u65f6\u89e6\u53d1\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\u770b\u5230\u4ee5\u4e0a\u8868\u683c\uff0c\u4f60\u5e94\u8be5\u4e00\u773c\u5c31\u770b\u5230\u4e86 retrieved<\/code> \u4e8b\u4ef6\uff0c\u662f\u7684\uff0c\u6ca1\u9519\uff0c\u6211\u4eec\u5c31\u9700\u8981\u5728\u6a21\u578b\u4ece\u6570\u636e\u5e93\u4e2d\u88ab\u68c0\u7d22\u51fa\u6765\u7684\u65f6\u5019\u53bb\u5904\u7406\uff0c\u73b0\u5728\u6539\u5199\u6211\u4eec\u7684 Comment \u6a21\u578b\u4ee3\u7801\u3002<\/p>\n<?php\n\nnamespace App\/Models;\n\nuse Illuminate\/Database\/Eloquent\/Factories\/HasFactory;\nuse Illuminate\/Database\/Eloquent\/Model;\nuse Illuminate\/Database\/Eloquent\/Relations\/MorphTo;\n\nclass Comment extends Model\n{\n use HasFactory;\n\n protected static function booted()\n {\n parent::booted();\n\n self::retrieved(function (Comment $comment) {\n $comment->attributes['commentable_type_class'] = match ((int) $comment->commentable_type) {\n 1 => Post::class,\n 2 => Video::class,\n default => $comment->commentable_type,\n };\n\n $comment->makeHidden(['commentable_type_class']);\n });\n }\n\n\n public function commentable(): MorphTo\n {\n return $this->morphTo('commentable', 'commentable_type_class', 'commentable_id', 'id');\n }\n\n}\n<\/code><\/pre>\n\u9996\u5148\uff0c\u5148\u8986\u76d6\u6389 booted \u65b9\u6cd5\uff0c\u5e76\u8c03\u7528 parent::booted()<\/code>\uff0c\u7136\u540e\u5f00\u59cb\u6211\u4eec\u7684\u903b\u8f91\u3002<\/p>\n\u5728 retrieved<\/code> \u65f6\uff0c\u6211\u4eec\u4fee\u6539\u4f20\u5165\u7684 Comment \u6a21\u578b\uff0c\u5411\u5176 $attributes<\/code> \u4e0a\u6dfb\u52a0\u4e00\u4e2a comment_type_class<\/code><\/p>\n\u4e0e\u6b64\u540c\u65f6\uff0c\u56e0\u4e3a\u6211\u4eec\u5e76\u4e0d\u5e0c\u671b\u8fd9\u4e2a\u5b57\u6bb5\u8fd4\u56de\u5230\u6211\u4eec\u7684\u54cd\u5e94\u4e2d\uff0c\u6240\u4ee5\u6211\u4eec\u4f7f\u7528\u4e86