{"id":2290,"date":"2015-05-12T21:30:23","date_gmt":"2015-05-12T13:30:23","guid":{"rendered":"http:\/\/blog.turn.tw\/?p=2290"},"modified":"2015-06-04T21:45:31","modified_gmt":"2015-06-04T13:45:31","slug":"arca%e6%9e%b6%e6%a7%8b%ef%bc%9a%e4%bb%a5-active-record-%e7%82%ba%e8%bb%b8%e5%bf%83%e7%9a%84%e6%9e%b6%e6%a7%8b","status":"publish","type":"post","link":"https:\/\/blog.turn.tw\/?p=2290","title":{"rendered":"ARCA\u67b6\u69cb\uff1a\u4ee5 Active Record \u70ba\u8ef8\u5fc3\u7684\u67b6\u69cb"},"content":{"rendered":"<p>\u8d8a\u4f86\u8d8a\u591a\u7684framework\u672c\u8eab\u63d0\u4f9bActive Record\u5be6\u4f5c\u3002<\/p>\n<p>\u4e0d\u7ba1\u662fRails\u7684Active Record\uff0c\u9084\u662fLaravel\u7684Eloquent\uff0c<\/p>\n<p>\u9019\u4e9bActive Record\u5be6\u4f5c\u7684\u529f\u80fd\u8d8a\u4f86\u8d8a\u8c50\u5bcc\u800c\u5f37\u5927\u3002<\/p>\n<p>\u5b83\u8b93\u958b\u767c\u901f\u5ea6\u66f4\u5feb\u4e86\uff0c\u4f46\u4e5f\u56e0\u70ba\u592a\u591a\u529f\u80fd\u585e\u5728\u4e00\u8d77\uff0c\u5bb9\u6613\u5beb\u51fa\u6975\u5ea6\u80a5\u80d6\u7684\u842c\u80fd\u985e\u5225\u3002<\/p>\n<p>\u8a72\u600e\u9ebc\u4f7f\u7528\u9019\u7a2e\u842c\u80fd\u985e\u5225\uff0c\u53c8\u4e0d\u81f3\u65bc\u8b93\u5b83\u80d6\u5230\u96e3\u4ee5\u7dad\u8b77\u5462\uff1f<\/p>\n<p>\u6211\u5f9e\u5de5\u4f5c\u4e2d\u6574\u7406\u51fa\u4e86\u7a31\u4e4b\u70baARCA\u7684\u67b6\u69cb\u3002\u4eca\u5929\u4f86\u8ddf\u5404\u4f4d\u5206\u4eab\u3002<\/p>\n<p><em>\u8a3b\uff1a\u672c\u6587\u7a0b\u5f0f\u78bc\u591a\u4ee5Laravel\u6846\u67b6\u8209\u4f8b\u3002\u4f46\u662f\u76f8\u95dc\u6982\u5ff5\u901a\u7528\u5728\u4efb\u4f55\u64c1\u6709Active Record\u7684\u8a9e\u8a00\/\u6846\u67b6\u3002<\/em><\/p>\n<h1>\u7c21\u4ecb<\/h1>\n<p>ARCA\u5168\u540d\u300cActive Record Centered Architecture\u300d\uff0c<\/p>\n<p>\u4e5f\u5c31\u662f\u300cActive Record\u4e2d\u5fc3\u67b6\u69cb\u300d\uff0c\u4ee5Active Record\u70ba\u4e3b\u8ef8\u7684\u8edf\u9ad4\u67b6\u69cb\u3002<\/p>\n<p>ARCA\u8a66\u5716\u5728\u4eab\u53d7Active Record\u5e36\u4f86\u7684\u958b\u767c\u901f\u5ea6\u7684\u540c\u6642\uff0c\u62c9\u51fa\u4e00\u5b9a\u7684\u67b6\u69cb\u3002<\/p>\n<p>\u9019\u5957\u67b6\u69cb\u9069\u7528\u65bc\u4e2d\u578b\u4ee5\u4e0a\uff08\u9023\u7e8c\u958b\u767c3\u500b\u6708\u4ee5\u4e0a\uff09\u5c08\u6848\uff0c\u4e0d\u9069\u7528\u65bc\u5c0f\u578b\u5c08\u6848\uff08\u50cf\u662f\u9910\u5ef3\u5b98\u7db2\uff09\u3002<\/p>\n<h1>ARCA\u67b6\u69cb<\/h1>\n<p>ARCA\u67b6\u69cb\u7531\u5e7e\u500b\u5143\u7d20\u7d44\u6210\uff0c\u6a94\u6848\u7d50\u69cb\u770b\u8d77\u4f86\u5982\u4e0b\uff08\u4ee5MVC\u8209\u4f8b\uff09\uff1a<\/p>\n<p><em>\u4e00\u500b\u5143\u7d20\u6703\u662f\u4e00\u500b\u8cc7\u6599\u593e\uff0c\u6216\u662f\u4e00\u500b\u6a94\u6848\uff08\u985e\u5225\uff09\u3002<\/em><\/p>\n<blockquote><p>\n\/View\u8cc7\u6599\u593e<br \/>\n\/Controller\u8cc7\u6599\u593e<br \/>\n\/Model\u8cc7\u6599\u593e<br \/>\n&#8230;.\/Entity Model\u8cc7\u6599\u593e<br \/>\n&#8230;&#8230;..\/Entity\u985e\u5225<br \/>\n&#8230;&#8230;..\/Repository\u985e\u5225<br \/>\n&#8230;&#8230;..\/Presenter\u985e\u5225<br \/>\n&#8230;&#8230;..\/Form\u985e\u5225<br \/>\n&#8230;.\/Service\u8cc7\u6599\u593e<br \/>\n&#8230;&#8230;..\/Service\u985e\u5225<br \/>\n&#8230;.\/Operation Model\u8cc7\u6599\u593e\n<\/p><\/blockquote>\n<h2>Entity Model\u8cc7\u6599\u593e<\/h2>\n<p>\u64fa\u653e\u8207\u4e00\u7a2eentity\u76f8\u95dc\u6982\u5ff5\u7684\u7a0b\u5f0f\u78bc\u3002<\/p>\n<p>\u5c07\u4e00\u7a2eentity\u76f8\u95dc\u7684\u7a0b\u5f0f\u78bc\u653e\u5728\u540c\u4e00\u500b\u8cc7\u6599\u593e\u3002<\/p>\n<h2>Entity\u985e\u5225<\/h2>\n<p>entity\u662f\u516c\u53f8\u5728\u4e4e\u7684\u5546\u696d\u9818\u57df\uff08domain\uff09\u4e2d\uff0c\u4ee3\u8868\u73fe\u5be6\u4e16\u754c\u7684\u4e00\u7a2e\u4e8b\u7269\u3002<\/p>\n<p>\u5e38\u898b\u7684entity\u5305\u542b\u8a02\u55ae\u3001\u5546\u54c1\u3001\u9867\u5ba2\u3001\u79ae\u5238\u3001\u6587\u7ae0\u3002<\/p>\n<p>\u901a\u5e38\u6703\u4ee3\u8868\u73fe\u5be6\u751f\u6d3b\u4e2d\u7684\u4e00\u7a2e\u4e8b\u7269\u3001\u9700\u8981\u5177\u5099ID\u3002<\/p>\n<p>\u5728ARCA\u4e2d\u8ca0\u8cac\u76f4\u63a5\u7e7c\u627fActive Record\u7684\u985e\u5225\u3002<\/p>\n<p>\u9019\u662fARCA\u67b6\u69cb\u7684\u91cd\u9ede\u6240\u5728\u3002\u9075\u7167\u5c11\u6578\u7684\u985e\u5225\u547d\u540d\u3001\u8cc7\u6599\u8868\u547d\u540d\u6163\u4f8b\uff08convention\uff09\uff0c<\/p>\n<p>\u76f4\u63a5\u8ce6\u4e88\u9019\u4e9bentity\u985e\u5225\u591a\u7a2e\u80fd\u529b\uff1a<\/p>\n<ul>\n<li>\u7269\u4ef6property\u5b58\u9032\u8cc7\u6599\u5eab\u7684\u76f8\u95dc\u64cd\u4f5c\uff08CRUD\uff09<\/li>\n<li>entity\u9593\u7684relationship<\/li>\n<li>\u5c0d\u8cc7\u6599\u5eab\u53d6\u51fa\u7684\u503c\u505a\u9069\u7576\u8f49\u63db<\/li>\n<\/ul>\n<p>\u800c\u958b\u767c\u8005\u6240\u8981\u505a\u7684\uff0c\u53ea\u662f\u5beb\u597d\u985e\u5225\u5b9a\u7fa9\u8207\u5e7e\u500b\u51fd\u5f0f\u800c\u5df2\u3002<\/p>\n<pre>\r\nclass User extends Eloquent {\r\n\r\n    public function phone()\r\n    {\r\n        return $this->hasOne('Phone');\r\n    }\r\n\r\n    public function comments()\r\n    {\r\n        return $this->hasMany('Comment');\r\n    }\r\n\r\n}\r\n<\/pre>\n<p>\u4e5f\u6b63\u662fActive Record\u7684\u591a\u529f\u80fd\uff0c\u8b93entity\u7684\u5efa\u7acb\u5982\u6b64\u8fc5\u901f\u3002<\/p>\n<p>\u516c\u53f8domain\u6240\u9700\u7684\u5546\u696d\u884c\u70ba\uff0c\u8207entity\u76f8\u95dc\u7684\u52d5\u4f5c\u90fd\u662f\u5beb\u5728\u6b64\u8655\u3002<\/p>\n<pre>\r\nclass User extends Eloquent {\r\n    \/\/ ...\r\n    public function addComment()\r\n    {\r\n        \/\/ ...\r\n    }\r\n}\r\n<\/pre>\n<h2>Repository\u985e\u5225<\/h2>\n<p>\u5c01\u88ddquery logic\uff0c\u63d0\u4f9b\u53d6\u5f97entity\uff08\u4e00\u6216\u591a\u500b\uff09\u7684\u4e0d\u540c\u65b9\u6cd5\u3002<\/p>\n<p>\u4e0d\u8ad6\u662fRails\u7684Active Record\u9084\u662fLaravel\u7684Eloquent\uff0c\u90fd\u6709\u63d0\u4f9b\u67e5\u8a62\uff08query\uff09\u7684\u529f\u80fd\u3002<\/p>\n<p>\u8209\u4f8b\u4f86\u8aaa\uff0c\u60f3\u8981\u62ff\u51fa\u65b0\u820a\u6392\u5e8f\u904e\u7684\u7cbe\u9078\u6587\u7ae0\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre>\r\nArticle::where('featured', true)\r\n            ->where('status', '=', Article::STATUS_PUBLISHED)\r\n            ->orderBy('published_at', 'desc')\r\n            ->get();\r\n<\/pre>\n<p>\u4f46\u662f\u9019\u5e7e\u884c\u7a0b\u5f0f\u78bc\u5f88\u53ef\u80fd\u5e38\u5e38\u7528\u5230\uff0c\u6703\u5230\u8655\u91cd\u8907\u3002<\/p>\n<p>\u9019\u6642\u5c31\u53ef\u4ee5\u7528repository\u5c01\u88dd\u9019\u6bb5code\uff1a<\/p>\n<pre>\r\n\r\nclass ArticleRepository\r\n{\r\n    public function getFeaturedArticles($count = 3)\r\n    {\r\n        return Article::where('featured', true)\r\n                           ->where('status', '=', Article::STATUS_PUBLISHED)\r\n                           ->orderBy('published_at', 'desc')\r\n                           ->take($count)\r\n                           ->get();\r\n    }\r\n}\r\n<\/pre>\n<p>\u4ee5\u9019\u6bb5\u5c01\u88dd\u4f86\u8b1b\uff0c\u4e0d\u4f46\u8b93controller\u5167\u7684code\u53ef\u8b80\u6027\u63d0\u6607\uff0c\u540c\u6642\u9084\u63d0\u4f9b\u53d6\u51fa\u4e0d\u540c\u6578\u91cf\u7684\u53c3\u6578\u529f\u80fd\u3002<\/p>\n<pre>\r\n\/\/ in controller\r\n$repository = new ArticleRepository();\r\n\r\n$articles = $repository->getFeaturedArticles(10);\r\n<\/pre>\n<p>ARCA\u5167\u7684repository\u90fd\u4f9d\u8cf4Active Record\u63d0\u4f9b\u7684query\u5be6\u4f5c\uff0c<\/p>\n<p>\u6240\u4ee5\u5efa\u7acb\u4e00\u500babstract class\u518d\u8b93\u6240\u6709repository\u90fd\u7e7c\u627f\u5b83\u662f\u4e00\u500b\u597d\u4e3b\u610f\u3002<\/p>\n<p>\u53c3\u8003\u9019\u4efd<a href=\"https:\/\/github.com\/LaravelIO\/laravel.io\/blob\/master\/src\/Core\/EloquentRepository.php\">EloquentRepository<\/a>\u548c<a href=\"https:\/\/github.com\/LaravelIO\/laravel.io\/blob\/master\/src\/Articles\/ArticleRepository.php\">ArticleRepository<\/a>\u5be6\u4f5c\u3002<\/p>\n<h2>Presenter\u985e\u5225<\/h2>\n<p>\u5c01\u88dd\u8207business logic\u7121\u95dc\uff0c\u53ea\u8207\u5448\u73fe\uff08presentation\uff09\u76f8\u95dc\u7684logic\u3002<\/p>\n<p>entity\u76f8\u95dc\u7684\u540d\u7a31\u3001\u91d1\u984d\u3001\u65e5\u671f\uff0c\u5e38\u5e38\u5728\u4e0d\u540c\u5730\u65b9\u6709\u4e0d\u540c\u5448\u73fe\u683c\u5f0f\u3002<\/p>\n<p>\u5c07\u9019\u4e9b\u5beb\u6210entity\u7684function\u53ef\u4e0d\u662f\u597d\u4e3b\u610f\u3002<\/p>\n<p>\u9019\u985epresentation logic\u53ef\u4ee5\u7368\u7acb\u6210presenter\u985e\u5225\u3002<\/p>\n<p>\uff08\u6216\u7a31View Objects&#8230;\u3002\u6ce8\u610f\uff1a\u8edf\u9ad4\u540d\u8a5e\u5728\u4e0d\u540c\u793e\u7fa4\u7684\u7528\u6cd5\u6975\u5ea6\u6df7\u4e82\u3002\uff09<\/p>\n<p>\u6982\u5ff5\u4e0a\u53ea\u662f\u5c07entity\u585e\u9032presenter\uff0c\u4e5f\u5c31\u662f<a href=\"http:\/\/zh.wikipedia.org\/wiki\/%E4%BF%AE%E9%A5%B0%E6%A8%A1%E5%BC%8F\">decorator pattern<\/a>\u3002<\/p>\n<p>\u5be6\u4f5c\u4e0a\u53ef\u4ee5\u4f9d\u4e0d\u540c\u8a9e\u8a00\u3001\u6846\u67b6\u7684\u7279\u8272\u767c\u63ee\u5275\u610f\u3002<\/p>\n<p>\u50cf\u662f<a href=\"https:\/\/github.com\/laracasts\/Presenter\">\u9019\u5957<\/a>\u5584\u7528\u4e86PHP\u7279\u6027\uff0c\u8b93presentation \u76f8\u95dc\u7684code\u660e\u78ba\u5206\u96e2\u3002<\/p>\n<p>Presenter\u9577\u9019\u6a23\uff1a<\/p>\n<pre>\r\nclass UserPresenter extends Presenter {\r\n    public function fullName()\r\n    {\r\n        return $this->first . ' ' . $this->last;\r\n    }\r\n}\r\n<\/pre>\n<p>\u63a5\u8457\u53ef\u4ee5\u5f9eentity\u76f4\u63a5\u4f7f\u7528presenter\u5be6\u9ad4\uff0c\u547c\u53ebpresentation logic\u3002<\/p>\n<pre>\r\n$user->present()->fullName\r\n<\/pre>\n<h2>Form\u985e\u5225<\/h2>\n<p>\u8655\u7406\u4f7f\u7528\u8005\u5f9eHTTP\u8868\u55ae\u586b\u5165\u7684\u8cc7\u6599\uff0c\u5c01\u88dd\u9a57\u8b49\uff08validation\uff09 logic\u3002<\/p>\n<p>web application\u5c11\u4e0d\u4e86\u5927\u91cf\u7684\u904b\u7528html\u8868\u55ae\u8207\u4f7f\u7528\u8005\u4e92\u52d5\u3002<\/p>\n<p>\u91dd\u5c0duser input\u7684\u9a57\u8b49 logic\uff08\u4f8b\u5982\u5b57\u4e32\u9577\u5ea6\u3001\u65e5\u671f\u3001\u91d1\u984d\u5927\u5c0f\uff09\u53ef\u4ee5\u62bd\u51fa\u4f86\u6210\u70baForm\u985e\u5225\u3002<\/p>\n<p>\uff08\u5728Laravel 5\u7a31\u70ba<a href=\"http:\/\/laravel.com\/docs\/master\/validation#form-request-validation\">Form Request<\/a>\uff0c\u5728Rails\u793e\u7fa4\u7a31\u70ba<a href=\"http:\/\/blog.codeclimate.com\/blog\/2012\/10\/17\/7-ways-to-decompose-fat-activerecord-models\/\">Form object<\/a>\uff09<\/p>\n<p>\u539f\u7406\u4e0a\u4f86\u8aaa\uff0c\u5c31\u662f\u5c07\u8868\u55ae\u50b3\u4f86\u7684\u53c3\u6578\u50b3\u7d66Form\u985e\u5225\uff0c\u5728\u88e1\u9762\u9a57\u8b49\u904e\u5f8c\u624d\u6c7a\u5b9a\u662f\u5426\u57f7\u884c\u4e0b\u4e00\u6b65\u9a5f\u3002<\/p>\n<p>\u8209\u4f8b\u4f86\u8aaa\uff0c\u9019\u4ef6\u4e8b\u82e5\u5728controller\u5167\u9032\u884c\uff0c\u770b\u8d77\u4f86\u5c31\u50cf\uff1a<\/p>\n<pre>\r\n$form = new ArticleForm( Input::all() );\r\n\r\nif ( ! $form->isValid() ){\r\n    return Redirect::back()->with( [ 'errors' => $form->getErrors() ] );    \r\n}\r\n\r\n$article = new Article( Input::only('title', 'content', 'status') );\r\n\r\n$article->save();\r\n<\/pre>\n<p>\u800cForm\u985e\u5225\u7684\u5be6\u4f5c\u5247\u4f9d\u7167\u8a9e\u8a00\/\u6846\u67b6\u7684\u4e0d\u540c\u5404\u81ea\u767c\u63ee\u3002<\/p>\n<p>\u8209\u4f8b\uff1a<a href=\"https:\/\/github.com\/solnic\/virtus\">Rails\u53ef\u7528Virtus<\/a>\u3001<a href=\"https:\/\/github.com\/LaravelIO\/laravel.io\/blob\/master\/src\/Core\/FormModel.php\">Laravel\u53ef\u61c9\u7528Validator<\/a><\/p>\n<h2>Service\u8cc7\u6599\u593e<\/h2>\n<p>\u64fa\u653e\u8de8domain\u6982\u5ff5\u7684\u7a0b\u5f0f\u78bc\u3002<\/p>\n<p>\u591a\u500bservice\u985e\u5225\u6703\u653e\u5728\u6b64\u8cc7\u6599\u593e\u3002<\/p>\n<h2>Service\u985e\u5225<\/h2>\n<p>\u6982\u5ff5\u4e0a\u4e0d\u5c6c\u65bc\u4efb\u4f55entity\u7684business logic\u53ef\u4ee5\u7368\u7acb\u6210service\u3002<\/p>\n<p>\u901a\u5e38\u662f\u65bd\u52a0\u5728\u591a\u500bentity\u4e0a\uff08\u4f86\u81ea\u4e0d\u540cdomain\uff09\u7684\u8907\u96dc\u884c\u70ba\u3002<\/p>\n<p>\u8209\u4f8b\u4f86\u8aaa\uff0c\u8a08\u7b97\u8a02\u55ae\u7684\u6298\u6263\u8207\u552e\u50f9\uff0c\u901a\u5e38\u6703\u6d89\u53ca\u8a02\u55ae\u8207\u79ae\u5238\uff0c\u4e26\u4e14\u904b\u7b97\u908f\u8f2f\u8f03\u70ba\u8907\u96dc\uff1a<\/p>\n<pre>\r\nclass PriceService\r\n{\r\n    public function calculate(Order $order, Coupon $coupon)\r\n    {\r\n        \/\/ ...\r\n    }\r\n}\r\n<\/pre>\n<p>\u4f7f\u7528\u6642\uff0c\u5c07entity\u50b3\u9032\u53bb\u5373\u53ef\uff1a<\/p>\n<pre>\r\n\/\/ in somewhere, maybe a controller\r\n\r\n$order = \/* get the order *\/;\r\n\r\n$coupon = \/* get the coupon *\/;\r\n\r\n$service = new PriceService();\r\n\r\n$service->calculate($order, $coupon);\r\n<\/pre>\n<h2>Operation Model\u8cc7\u6599\u593e<\/h2>\n<p>\u570d\u7e5e\u67d0\u7a2e\u884c\u70ba\u6982\u5ff5\u7684\u7a0b\u5f0f\u78bc\u53ef\u4ee5\u6574\u7406\u8d77\u4f86\u3001\u653e\u5728\u4e00\u8d77\u3002<\/p>\n<p>\u7576service\u958b\u59cb\u4f9d\u8cf4\u5176\u4ed6service\u6642\uff0c\u4ee3\u8868\u9019\u9805\u884c\u70ba\u958b\u59cb\u8b8a\u5f97\u8907\u96dc\u3001\u958b\u59cb\u9020\u6210\u7406\u89e3\u7684\u56f0\u96e3\u3002<\/p>\n<p>\u8a66\u8457\u770b\u6e05\u662f\u54ea\u500b\u6982\u5ff5\uff08\u9019\u5f88\u4e0d\u5bb9\u6613\uff09\u3001\u4ee5\u5b83\u547d\u540d\uff08\u4e5f\u4e0d\u5bb9\u6613\uff09\uff0c\u5efa\u7acb\u51faOperation model\u3002<\/p>\n<p>\u8209\u4f8b\u4f86\u8aaa\uff0c\u96fb\u5b50\u5546\u52d9\u516c\u53f8\u63d0\u4f9b\u5831\u50f9\u6703\u540c\u6642\u6d89\u53ca\u300c\u79ae\u5238\u6298\u6263\u300d\u3001\u300c\u51fa\u8ca8\u65e5\u671f\u300d\u3001\u300c\u7e3d\u91d1\u984d\u300d\u7684\u8a08\u7b97\u3002<\/p>\n<p>\u4e5f\u5c31\u662fQuotationService\uff08\u5831\u50f9\uff09\u6703\u7528\u5230DiscountService\uff08\u8a08\u7b97\u6298\u6263\u91d1\u984d\uff09,<\/p>\n<p> DueDateService\uff08\u8a08\u7b97\u51fa\u8ca8\u65e5\u671f\uff09, PriceService\uff08\u8a08\u7b97\u7e3d\u91d1\u984d\uff09\u3002<\/p>\n<p>\u9019\u6642\u53ef\u4ee5\u5c07\u5b83\u5011\u5f9eService\u8cc7\u6599\u593e\u79fb\u51fa\u3001\u5efa\u7acb\u4e00\u500bQuotation\u8cc7\u6599\u593e\u3001\u518d\u5168\u90e8\u4e1f\u9032\u53bb\u3002<\/p>\n<p>\u4e1f\u9032\u53bb\u4e4b\u5f8c\u53ef\u4ee5\u9032\u884c\u9069\u7576\u7684refactoring\uff0c\u589e\u52a0\u9019\u5e7e\u500b\u985e\u5225\u9593\u7684cohesion\uff0c\u964d\u4f4e\u4e4b\u5f8c\u7406\u89e3\u7684\u56f0\u96e3\u3002<\/p>\n<p>\u4e5f\u53ef\u4ee5\u9032\u4e00\u6b65\u4f7f\u7528<a href=\"http:\/\/zh.wikipedia.org\/wiki\/%E5%A4%96%E8%A7%80%E6%A8%A1%E5%BC%8F\">Facade Pattern<\/a>\u5c01\u88dd\u9019\u4e9b\u985e\u5225\uff0c\u5efa\u7acb\u4e00\u500b\u7d71\u4e00\u5c0d\u5916\u7684\u63a5\u53e3\uff0c<\/p>\n<p>\u964d\u4f4e\u5176\u4ed6\u5730\u65b9\u7684\u7a0b\u5f0f\u78bc\u8207\u9019\u500bOperation Model\u7684coupling\u3002<\/p>\n<p>\u4ee5\u4e0a\u9762\u5831\u50f9\u7684\u4f8b\u5b50\u4f86\u8aaa\uff1a<\/p>\n<pre>\r\nclass QuotationManager \/\/ \u6211\u6c7a\u5b9a\u5c07\u5b83\u76f4\u63a5\u8996\u70ba\u67d0\u7a2e\u7ba1\u7406\u54e1\uff0c\u4e0d\u518d\u8996\u70ba\u55ae\u7d14\u7684service\r\n{\r\n    \r\n    protected $due;\r\n    \r\n    protected $price;\r\n\r\n    protected $discount;\r\n    \r\n    public function __construct(DueDateService $due, PriceService $price, DiscountService $discount)\r\n    {\r\n        $this->due = $due;\r\n        \r\n        $this->price = $price;\r\n        \r\n        $this->discount = $discount;\r\n    }\r\n    \r\n    public function calculate(Order $order)\r\n    {\r\n        \/\/ \u53ef\u80fd\u4f9d\u5e8f\u57f7\u884c\u67d0\u4e9bbusiness logic\uff0c\u4e5f\u53ef\u80fd\u53ea\u662f\u76f4\u63a5\u547c\u53eb\u5e95\u4e0b\u7684service\r\n        \/*\r\n        $this->due->calculate($order);\r\n        \r\n        $this->price->calculate($order);\r\n        *\/\r\n    }\r\n    \r\n    public function discount(Order $order, Coupon $coupon)\r\n    {\r\n        \/\/ \u53ef\u80fd\u4f9d\u5e8f\u57f7\u884c\u67d0\u4e9bbusiness logic\uff0c\u4e5f\u53ef\u80fd\u53ea\u662f\u76f4\u63a5\u547c\u53eb\u5e95\u4e0b\u7684service\r\n        \/\/ $this->discount->calculate($order, $coupon);\r\n    }\r\n   \r\n}\r\n\r\n\r\n<\/pre>\n<h1>\u7d50\u8a9e<\/h1>\n<p>\u8a0e\u8ad6\u67b6\u69cb\u6642\uff0c\u901a\u5e38\u53ea\u8a0e\u8ad6\u6982\u5ff5\uff0c\u4e0d\u5c07\u6a94\u6848\u7d50\u69cb\u5217\u5165\u8a0e\u8ad6\u3002<\/p>\n<p>\u6211\u8a8d\u70ba\u90a3\u6a23\u7684\u8a0e\u8ad6\u8b93\u5f88\u591a\u4eba\u6709\u770b\u6c92\u6709\u61c2\uff0c\u6240\u4ee5\u5c07\u6a94\u6848\u7d50\u69cb\u4e00\u4f75\u7d0d\u5165ARCA\u8aaa\u660e\u4e86\u3002<\/p>\n<p>ARCA\u4e0d\u662f\u4e00\u7a2e\u7406\u8ad6\u6216\u662f\u7121\u6575\u7684\u67b6\u69cb\uff0c\u53ea\u662f\u4e00\u7a2e\u7528\u4f86\u642d\u914dActive Record\uff0c<\/p>\n<p>\u5c07\u5e38\u7528\u5143\u7d20\uff08\u6216\u8aaa\u662fDesign Pattern\uff09\u7d44\u5408\u8d77\u4f86\u7684\u4e00\u7a2e\u65b9\u5f0f\u800c\u5df2\u3002<\/p>\n<p>\u53ef\u4ee5\u5c07ARCA\u67b6\u69cb\u8996\u70ba\u4e00\u7a2e\u9069\u5408\u65b0\u5275\u516c\u53f8\u5feb\u901f\u958b\u767c\u7684\u3001\u901a\u7528\u7684\u4e2d\u578b\u57fa\u672c\u67b6\u69cb\u3002<\/p>\n<p>\u96a8\u8457\u60c5\u6cc1\u4e0d\u540c\uff0c\u505a\u51fa\u8abf\u6574\u3001\u589e\u6e1b\u5143\u7d20\uff08\u4f8b\u5982\u597d\u7528\u7684Factory\u985e\u5225\uff09\u5373\u53ef\u3002<\/p>\n<p>\u6709\u4efb\u4f55\u7591\u554f\uff0c\u6216\u662f\u6709\u63a8\u85a6\u7684\u597d\u7528Design Pattern\uff0c\u89ba\u5f97\u9069\u5408\u52a0\u9032ARCA\u55ce\uff1f<\/p>\n<p>\u6b61\u8fce\u5728\u4e0b\u65b9\u7559\u8a00\uff0c\u6216\u662f\u5728 Twitter <a href=\"https:\/\/twitter.com\/howtomakeaturn\">@howtomakeaturn<\/a> \u548c\u6211\u8a0e\u8ad6\u3002<\/p>\n<hr \/>\n<h3>Q&#038;A<\/h3>\n<p><strong><em>Q1: Service\u985e\u5225\u7684\u4f8b\u5b50\u602a\u602a\u7684&#8230;\u660e\u660e\u53ef\u4ee5\u5beb\u9032\u5176\u4e2d\u4e00\u7a2eentity\u554a\uff01\u50cf\u662f\u9019\u6a23\u5c31\u53ef\u5beb\u9032\u8a02\u55aeentity\uff1a<br \/>\n<\/em><\/strong><\/p>\n<pre>\r\nclass Order extends Eloquent\r\n{\r\n    public function calculatePrice(Coupon $coupon)\r\n    {\r\n        \/\/ ...\r\n    }\r\n}\r\n<\/pre>\n<p><strong><em>\u4f55\u6642\u653e\u5728entity\uff0c\u4f55\u6642\u7368\u7acb\u6210service\u5462\uff1f<br \/>\n<\/em><\/strong><br \/>\n\u5982\u4f60\u6240\u8aaa\uff0c\u4e00\u9805\u884c\u70ba\u7a76\u7adf\u662f\u5426\u8db3\u5920\u300c\u8907\u96dc\u300d\u5230\u9700\u8981\u7368\u7acb\u51fa\u4f86\uff0c\u7684\u78ba\u5c6c\u65bc\u958b\u767c\u8005\u7684\u4e3b\u89c0\u5224\u65b7\u3002<\/p>\n<p>\u4f46\u662f\u8a8d\u5b9a\u6240\u6709\u884c\u70ba\u90fd\u4e0d\u300c\u8907\u96dc\u300d\u7684\u8a71\uff0centity\u5f88\u5bb9\u6613\u8b8a\u5f97\u6975\u5ea6\u80a5\u80d6\u5594\u3002<\/p>\n<p><strong><em>Q2: \u6211\u89ba\u5f97\u7528Active Record\u6703\u8b93\u6e2c\u8a66\u5f88\u96e3\u5beb\uff0c\u6709\u89e3\u6cd5\u55ce\uff1f<br \/>\n<\/em><\/strong><br \/>\n\u9019\u78ba\u5be6\u662fActive Record\u7684\u4e00\u5927\u7f3a\u9ede\uff1a\u5728\u6e2c\u8a66\u6642\u5f88\u96e3\u4e0d\u53bb\u78b0\u5230database\u3002<\/p>\n<p>\u4f7f\u7528\u5feb\u901f\u5efa\u7acb\u6e2c\u8cc7\u7684\u5957\u4ef6\uff0c\u4f3c\u4e4e\u662f\u552f\u4e00\u80fd\u52c9\u5f37\u63a5\u53d7\u7684\u65b9\u6cd5\u3002<\/p>\n<p>Ruby\u6709<a href=\"https:\/\/github.com\/thoughtbot\/factory_girl\">factory_girl<\/a>\uff0cPHP\u6709<a href=\"https:\/\/github.com\/thephpleague\/factory-muffin\">Factory Muffin<\/a>\u3002<\/p>\n<p>\u53c3\u8003\u770b\u770b\u5427\u3002<\/p>\n<p>(Photo via <a href=\"https:\/\/www.flickr.com\/photos\/xavier33300\/\">SuperCar-RoadTrip.fr<\/a>, CC licensed)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8d8a\u4f86\u8d8a\u591a\u7684framework\u672c\u8eab\u63d0\u4f9bActive Record\u5be6\u4f5c\u3002 \u4e0d\u7ba1\u662fRails\u7684Active Reco &hellip; <a href=\"https:\/\/blog.turn.tw\/?p=2290\" class=\"more-link\">\u7e7c\u7e8c\u95b1\u8b80 <span class=\"screen-reader-text\">ARCA\u67b6\u69cb\uff1a\u4ee5 Active Record \u70ba\u8ef8\u5fc3\u7684\u67b6\u69cb<\/span> <span class=\"meta-nav\">&rarr;<\/span> <\/a><\/p>\n","protected":false},"author":1,"featured_media":2367,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[2,4],"tags":[42,43,8,36,25],"_links":{"self":[{"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/posts\/2290"}],"collection":[{"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2290"}],"version-history":[{"count":166,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/posts\/2290\/revisions"}],"predecessor-version":[{"id":2495,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/posts\/2290\/revisions\/2495"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=\/wp\/v2\/media\/2367"}],"wp:attachment":[{"href":"https:\/\/blog.turn.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2290"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2290"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.turn.tw\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2290"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}