{"id":2064,"date":"2015-04-03T21:03:59","date_gmt":"2015-04-03T13:03:59","guid":{"rendered":"http:\/\/blog.turn.tw\/?p=2064"},"modified":"2015-04-06T12:58:08","modified_gmt":"2015-04-06T04:58:08","slug":"codeigniter%e4%b8%8d%e6%98%afoop%e5%a5%bd%e8%80%81%e5%b8%ab","status":"publish","type":"post","link":"https:\/\/blog.turn.tw\/?p=2064","title":{"rendered":"CodeIgniter\u4e0d\u662fOOP\u597d\u8001\u5e2b"},"content":{"rendered":"

\u5beb\u5b8c\u6846\u67b6\u4e0d\u61c9\u8a72\u6709\u300cMODELS\u300d\u8cc7\u6599\u593e<\/a>\u4e4b\u5f8c\uff0c<\/p>\n

\u6536\u5230\u6797\u5148\u751f\u4f86\u4fe1\u5982\u4e0b\uff1a<\/p>\n

\u60a8\u597d, \u6211\u525b\u62dc\u8b80\u5b8c\u60a8\u7684\u300c\u6846\u67b6\u4e0d\u61c9\u8a72\u6709\u300cmodels\u300d\u8cc7\u6599\u593e\u300d
\n\u6211\u5c0d\u6587\u7ae0\u7684\u5167\u5bb9\u6709\u8a31\u591a\u5730\u65b9\u4e0d\u7406\u89e3…\u4e0d…\u53ef\u4ee5\u8aaa\u662f\u6df7\u4e82
\n\u6211\u672c\u8eab\u8f03\u719f\u6089\u7684\u6846\u67b6\u53ea\u6709CI, \u5e73\u6642\u7684\u64b0\u5beb\u6a21\u5f0f\u5c31\u662f\u5c07\u4f7f\u7528\u8005\u7684\u8f38\u5165\u653e\u5728controller\u505a\u9a57\u8b49, \u9a57\u8b49\u901a\u904e\u4e4b\u5f8c\u624d\u6703\u5c07\u4e4b\u4e1f\u9032model class(\u6216\u662f\u60a8\u7a31\u547c\u7684 entities)\u505a\u8655\u7406, \u4e1f\u9032model class\u8655\u7406\u6642\u6703\u6709\u4e00\u4e9b\u9664\u4e86\u771f\u6b63\u8a72\u57f7\u884c\u7684\u4efb\u52d9\u5916\u4ee5\u5916\u7684\u884c\u70ba(\u50cf\u662f\u8a3b\u518a\u65b0\u6703\u54e1\u6642\u6211\u6703\u9700\u8981\u6aa2\u67e5\u5e33\u865f\u662f\u5426\u5df2\u88ab\u4f7f\u7528\u6216\u662f\u4e0d\u662f\u9ed1\u540d\u55ae), \u6839\u64damodel class \u7684\u56de\u61c9\u7d50\u679c\u6c7a\u5b9acontroller\u8a72\u8f38\u51fa\u4ec0\u9ebc\u7d50\u679c\u6216view
\n\u7136\u5f8c\u6211\u770b\u5230\u4e86\u300c\u62bd\u51fa\u884c\u70ba\u908f\u8f2f\u8b8a\u6210Service Objects\u3001\u62bd\u51fa\u8868\u55ae\u9a57\u8b49\u908f\u8f2f\u8b8a\u6210Form Objects\u3001\u62bd\u51fa\u8cc7\u6599\u5eab\u67e5\u8a62\u908f\u8f2f\u8b8a\u6210Query Objects\u3001\u62bd\u51fa\u5448\u73fe\u908f\u8f2f\u8b8a\u6210View Objects\u2026\u807d\u8d77\u4f86\u771f\u68d2\uff0c\u4e5f\u78ba\u5be6\u5f88\u6709\u5e6b\u52a9\uff0c\u4e0d\u662f\u55ce\uff1f\u300d\u9019\u4e00\u6bb5, \u60a8\u60f3\u8868\u9054\u7684\u610f\u601d\u662f\u5426\u662f\u5c07\u5404\u7a2e\u884c\u70ba(\u9a57\u8b49\u8f38\u5165\u8cc7\u6599\u3001\u67e5\u8a62\/\u5beb\u5165\u8cc7\u6599\u5eab\u6216\u5176\u4ed6\u7684\u884c\u70ba\u908f\u8f2f)\u7d30\u5206\u51fa\u4f86\u653e\u5728model(\u6216\u50cf\u60a8\u6240\u7684\u4f9d\u7167\u5c08\u6848\/\u516c\u53f8\u540d\u7a31\u505a\u5206\u985e)\u5e95\u4e0b, \u800ccontroller\u5247\u662f\u626e\u6f14\u64cd\u4f5c\u9019\u4e9bentities\u89d2\u8272\uff1f<\/p><\/blockquote>\n

\u6211\u53ef\u4ee5\u7406\u89e3\u4f60\u7684\u56f0\u60d1\uff0c\u6211\u53ef\u4ee5\u7406\u89e3\u4f60\u7684\u6df7\u4e82\u3002<\/p>\n

\u6211\u6709\u6574\u6574\u4e00\u5e74\u4f7f\u7528CodeIgniter\u958b\u767c\u3002<\/p>\n

\u7576\u6211\u7b2c\u4e00\u6b21\u770b\u5230Reddit<\/a>\u4e0a\u982d\u5927\u5bb6\u7684\u8a0e\u8ad6\u3001\u7576\u6211\u7b2c\u4e00\u6b21\u770b\u5230Laravel\u8ad6\u58c7\u7684\u539f\u59cb\u78bc<\/a>\uff0c<\/p>\n

\u6211\u4e5f\u662f\u5b8c\u5168\u4e00\u982d\u9727\u6c34\uff1a\u9019\u4e9b\u4eba\u5728\u7528\u7684PHP\u8ddf\u6211\u5728\u7528\u7684PHP\u662f\u540c\u4e00\u500b\u55ce\uff1f<\/p>\n

\u8f49\u9032Laravel\u793e\u7fa4\u5e7e\u500b\u6708\u4e4b\u5f8c\uff0c\u6211\u7d42\u65bc\u77e5\u9053\u554f\u984c\u51fa\u5728\u54ea\u4e86\u3002\u8acb\u807d\u6211\u5a13\u5a13\u9053\u4f86\u3002<\/p>\n

CI\u4e0d\u9f13\u52f5\u4f60\u6253\u9020Entity<\/h1>\n

…\u9a57\u8b49\u901a\u904e\u4e4b\u5f8c\u624d\u6703\u5c07\u4e4b\u4e1f\u9032model class(\u6216\u662f\u60a8\u7a31\u547c\u7684 entities)…<\/p><\/blockquote>\n

\u9019\u53e5\u8a71\u4e0d\u6b63\u78ba\u3002CI\u7684Model\u4e0d\u662fEntity\u3002<\/p>\n

…\u800ccontroller\u5247\u662f\u626e\u6f14\u64cd\u4f5c\u9019\u4e9bentities\u89d2\u8272\uff1f<\/p><\/blockquote>\n

\u9019\u53e5\u8a71\u4e0d\u6b63\u78ba\u3002service object, view object, form object\u90fd\u4e0d\u662fentity\u3002\u5b83\u5011\u662f\u8207entity\u76f8\u95dc\u7684\u985e\u5225\u3002<\/p>\n

CI\u7684Model\u4e26\u6c92\u6709\u4ee3\u8868\u300c\u73fe\u5be6\u751f\u6d3b\u4e2d\u7684\u4e00\u7a2e\u4e8b\u7269\u300d\uff0c<\/p>\n

\u5b83\u53ea\u662f\u8ca0\u8cac\u300c\u628a\u4e00\u5f35\u8cc7\u6599\u8868\u7684\u5167\u5bb9\u76f4\u63a5\u4e1f\u56de\u53bb\u300d\u800c\u5df2\u3002<\/p>\n

\u4ee5Blog Model\u8209\u4f8b\uff0c\u5047\u8a2d\u5b83\u5728\u8cc7\u6599\u8868\u6709title\u8ddfcontent\u6b04\u4f4d\uff0c\u4f46\u662f\u6c92\u6709summary\u6b04\u4f4d\u3002<\/p>\n

\u5982\u679c\u6211\u5011\u9700\u8981\u6587\u7ae0\u7c21\u4ecbsummary\uff08\u7531title\u52a0\u4e0acontent\u524d100\u5b57\u7d44\u5408\u800c\u6210\uff09\uff0c<\/p>\n

\u5728Laravel\u5b83\u6703\u662f\u9019\u6a23\uff1a<\/p>\n

\r\nclass Blog extends Eloquent\r\n{\r\n    public function summary()\r\n    {\r\n        return $this->title . substr($this->content, 0, 100);\r\n    }\r\n}\r\n<\/pre>\n
\u5728Model\u4e4b\u5916\u7528\u5230Entity\u7684\u6642\u5019\uff0c\u6703\u662f\u9019\u6a23\uff1a<\/p>\n
\r\n$blog = Blog::find($id);\r\n\r\necho $blog->summary();\r\n<\/pre>\n
\u4f60\u5f97\u5230\u4e86$blog\u9019\u500bentity\uff0c\u5b83\u4ee3\u8868\u8457\u4e00\u7bc7\u90e8\u843d\u683c\u6587\u7ae0\u3002<\/p>\n
\u9019\u7bc7\u6587\u7ae0\u5f88\u6a02\u610f\u544a\u8a34\u4f60\u5b83\u7684summary\u3002<\/p>\n
\u4f46\u662f\u5728CI\u5462\uff1f<\/p>\n
\r\nclass Blog_model extends CI_Model {\r\n    \/\/...\r\n}\r\n<\/pre>\n
\r\n\r\n$this->load->model('Blog_model', 'blog');\r\n\r\n$blog = $this->blog->get($id);\r\n\r\necho $blog->summary();\/\/ \u5674error\uff01\u6211\u6839\u672c\u4e0d\u662f\u4e00\u7bc7\u6587\u7ae0\uff01\u6211\u53ea\u662f\u4e00\u500b\u9663\u5217\u5440\uff01\r\n<\/pre>\n
\u5f9eCI\u7684Model\u62ff\u5230\u7684\u6771\u897f\uff0c\u53ea\u4ee3\u8868\u300c\u8ddf\u6587\u7ae0\u76f8\u95dc\u7684\u4e00\u5768\u8cc7\u6599\u300d\u3002\u53ef\u4ee5\u662fArray\u6216\u662fstdClass\u3002<\/p>\n
\u4e26\u4e0d\u4ee3\u8868\u4e00\u7bc7\u90e8\u843d\u683c\u6587\u7ae0\uff0c\u4e5f\u7121\u6cd5\u5177\u6709\u300c\u884c\u70ba\u300d\u3002<\/p>\n
CI\u7684Model\u4e0d\u662fEntity\u3002<\/p>\n
\u6211\u63d0\u5230\u7684Service Objects\u3001Query Objects\u3001View Objects\u90fd\u662f\u570d\u7e5e\u8457Entity\u6253\u8f49\uff0c\u800cCI\u672c\u8eab\u53ea\u5e6b\u4f60\u62c9\u8cc7\u6599\u51fa\u4f86\uff0c\u6c92\u5e6b\u4f60\u505aEntity\u3002\u4e5f\u96e3\u602a\u6703\u4e00\u5718\u6df7\u4e82\u4e86\u3002<\/p>\n
\u600e\u9ebc\u6703\u9019\u6a23\uff1f<\/h1>\n
\u9019\u88e1\u7684Entity\u8aaa\u7a7f\u4e86\u5c31\u662f\u5c07\u8cc7\u6599\u5eab\u7684\u8cc7\u6599\u8f49\u63db\u6210\u7269\u4ef6\u800c\u5df2\u3002<\/p>\n
\u53ef\u4ee5\u81ea\u5df1\u5bebClass\u624b\u52d5\u5c07\u8cc7\u6599\u5eab\u7684value\u4e00\u500b\u4e00\u500b\u8f49\u6210\u7269\u4ef6\u7684property\u3002\u9019\u9ebc\u505a\u53c8\u9ebb\u7169\u53c8\u7de9\u6162\u3002<\/p>\n
\u5e38\u898b\u7684\u4f5c\u6cd5\u662f\u76f4\u63a5\u7528ORM\uff0c\u53ef\u4ee5\u662fData Mapper Pattern\u6216\u662f\u66f4\u5e38\u898b\u7684Active Record Pattern\u3002<\/p>\n
\u8a31\u591a\u6846\u67b6\u90fd\u6703\u63d0\u4f9bActive Record Pattern\u7684\u5be6\u4f5c\uff0cLaravel, Rails\u90fd\u662f\u3002<\/p>\n
\u6709Entity\u53ef\u4ee5\u5e79\u561b\uff1f<\/h1>\n
\u53ef\u4ee5\u8b93\u7a0b\u5f0f\u78bc\u66f4\u512a\u96c5\u3002<\/p>\n
\u6211\u5c31\u76f4\u63a5\u62ffView Objects\u3001Query Objects\u3001Form Objects\u505a\u8209\u4f8b\u4e86\u3002<\/p>\n
View Objects<\/h2>\n
\u4ee5\u9019\u500bView Object\u5be6\u4f5c<\/a>\u70ba\u4f8b\uff0c<\/p>\n
\u4f60\u53ef\u4ee5\u628aUser Entity\u4e2d\u53ea\u8207\u300c\u5448\u73fe\u300d\u76f8\u95dc\u7684logic\u62bd\u51fa\u4f86\u6210\u9019\u7a2e\u985e\u5225\uff1a<\/p>\n
\r\nuse Laracasts\\Presenter\\Presenter;\r\n\r\nclass UserPresenter extends Presenter {\r\n\r\n    public function fullName()\r\n    {\r\n        return $this->first . ' ' . $this->last;\r\n    }\r\n\r\n    public function accountAge()\r\n    {\r\n        return $this->created_at->diffForHumans();\r\n    }\r\n\r\n}\r\n<\/pre>\n
\u4f7f\u7528\u7684\u6642\u5019\u9019\u6a23\u5373\u53ef\uff1a<\/p>\n
\r\n echo \"Hello, \"  . $user->present()->fullName;\r\n<\/pre>\n
Query Objects<\/h2>\n
\u4ee5\u9019\u500bQuery Object\u5be6\u4f5c<\/a>\u70ba\u4f8b\uff0c<\/p>\n
\u4f60\u53ef\u4ee5\u628a\u53d6\u5f97\u6587\u7ae0\u7684\u591a\u7a2e\u4e0d\u540c\u65b9\u5f0flogic\u7368\u7acb\u51fa\u4f86\uff0c\u6210\u70ba\u9019\u6a23\u7684class\uff1a<\/p>\n
\r\nclass ArticleRepository extends EloquentRepository\r\n{\r\n    public function getFeaturedArticles($count = 3)\r\n    {\r\n        return $this->model->with(['author', 'slug'])\r\n                           ->where('status', '=', Article::STATUS_PUBLISHED)\r\n                           ->orderBy('published_at', 'desc')\r\n                           ->take($count)\r\n                           ->get();\r\n    }\r\n    public function getAllPublishedByTagsPaginated($tags, $perPage = 10)\r\n    {\r\n        return $this->getAllPublishedByTagsQuery($tags)->paginate($perPage, ['articles.*']);\r\n    }\r\n    public function getAllPublishedByTagsQuery($tags)\r\n    {\r\n        $query = $this->model->with(['author'])\r\n                             ->where('status', '=', Article::STATUS_PUBLISHED)\r\n                             ->join('article_tag', 'articles.id', '=', 'article_tag.article_id')\r\n                             ->orderBy('published_at', 'desc')\r\n                             ->groupBy('articles.id');\r\n        if ($tags->count() > 0) {\r\n            $query->whereIn('article_tag.tag_id', $tags->lists('id'));\r\n        }\r\n        return $query;\r\n    }\r\n    public function getArticlesByAuthorPaginated(User $author, $perPage = 20)\r\n    {\r\n        return $this->getArticlesByAuthor($author)->paginate($perPage);\r\n    }\r\n    public function getArticlesByAuthor(User $author)\r\n    {\r\n        return $author->articles()->orderBy('articles.status', 'asc')->orderBy('published_at', 'desc')->orderBy('created_at', 'desc');\r\n    }\r\n\r\n}\r\n<\/pre>\n
\u5728\u4f7f\u7528\u7684\u6642\u5019\uff0c\u53ea\u8981\u9019\u6a23\u5373\u53ef\uff1a<\/p>\n
\r\n    \/\/\u9019\u662fcontroller\u4e2d\u7684\u4e00\u500bfunction\r\n    public function getIndex()\r\n    {\r\n        $repository = new ArticleRepository();\r\n        \/\/ \u53d6\u5f97\u5df2\u767c\u5e03\u7684\u7279\u5b9a\u6a19\u7c64\u7684\u7279\u5b9a\u5206\u9801\u4e0b\u7684\u6240\u6709\u6587\u7ae0\r\n        $articles = $repository->getAllPublishedByTagsPaginated($tags);\r\n        \/\/ ...\r\n    }\r\n<\/pre>\n
Form Objects<\/h2>\n
Form Objects\u5012\u662f\u8ddfentity\u6bd4\u8f03\u7121\u95dc\uff0c\u4f46\u6211\u9084\u662f\u8209\u4f8b\u7d66\u4f60\u770b\u5b83\u9577\u76f8\u3002<\/p>\n
\u4ee5\u9019\u500bForm Object\u5be6\u4f5c<\/a>\u70ba\u4f8b\uff0c<\/p>\n
\u4f60\u53ef\u4ee5\u628a\u5efa\u7acbArticle\u7684\u8868\u55ae\u9a57\u8b49logic\u62bd\u51fa\u4f86\u6210\u9019\u7a2e\u985e\u5225\uff1a<\/p>\n
\r\nclass ArticleForm extends FormModel\r\n{\r\n    protected $validationRules = [\r\n        'title'           => 'required|min:10',\r\n        'content'         => 'required',\r\n        'laravel_version' => 'required',\r\n        'status'          => 'required',\r\n        'tags'            => 'required|max_tags:3',\r\n    ];\r\n    protected function beforeValidation()\r\n    {\r\n        \\Validator::extend('max_tags', function($attribute, $tagIds, $params) {\r\n            $maxCount = $params[0];\r\n            $tagRepo = \\App::make('Lio\\Tags\\TagRepository');\r\n            $tags = $tagRepo->getTagsByIds($tagIds);\r\n            if ($tags->count() > $maxCount) {\r\n                return false;\r\n            }\r\n            return true;\r\n        });\r\n    }\r\n}\r\n<\/pre>\n
\u5728\u4f7f\u7528\u7684\u6642\u5019\uff0c\u53ea\u8981\u9019\u6a23\u5373\u53ef\uff1a<\/p>\n
\r\n   \/\/ \u9019\u662f\u5728controller\u5167\u7684\u4e00\u500bfunction\r\n   public function postCreate()\r\n   {\r\n        $form = new ArticleForm();\r\n        if ( ! $form->isValid()) { \/\/\u9a57\u8b49\u8868\u55ae\u5167\u5bb9\u662f\u5426\u6eff\u8db3\u689d\u4ef6\r\n             \/\/ \u986f\u793a\u932f\u8aa4\u8a0a\u606f\u53eb\u4f7f\u7528\u8005\u91cd\u65b0\u8f38\u5165\r\n        }\r\n        \/\/ ...\r\n   }\r\n<\/pre>\n
\u4ee5\u4e0a\uff0c\u4f60\u6703\u767c\u73fe\u5404\u5f0f\u5404\u6a23\u7684logic\u90fd\u53ef\u4ee5\u62c6\u5206\u6210\u7368\u7acbclass\uff0c\u8b93\u601d\u7dad\u4e0a\u6bd4\u8f03OOP\u3002<\/p>\n
controller\u88e1\u9762\u7684code\u53ef\u8b80\u6027\u4e5f\u9ad8\u5f88\u591a\u3002<\/p>\n
\u9019\u4e9b\u5728CI\u4e2d\u6bd4\u8f03\u96e3\u505a\u5230\u3002CodeIgniter\u4e0d\u662fOOP\u597d\u8001\u5e2b\u3002<\/p>\n
\u7576\u7136\u4e86\uff0c\u6709\u4e9b\u4eba\u5f88\u8a0e\u53adOOP\uff0c\u5c0d\u5b83\u4e00\u9ede\u8208\u8da3\u4e5f\u6c92\u6709\u3002\u770b\u8457\u8fa6\u5427\u3002<\/p>\n
\n
Q&A<\/h1>\n
Q1: \u53ef\u662fCI\u6709Active Record\u985e\u5225<\/a>\u554a\uff1f<\/em><\/strong><\/p>\n
CI\u7684Active Record\u985e\u5225\u662f\u6574\u500bCI\u793e\u7fa4\u6700\u60b2\u6158\u7684\u8aa4\u6703\u4e4b\u4e00\u3002<\/p>\n
CI\u7684Active Record\u5b8c\u5168\u662f\u53eb\u723d\u7684\u3002<\/p>\n
\u90a3\u6839\u672c\u6c92\u6709\u5be6\u4f5cActive Record Pattern\uff0c\u53ea\u662f\u500b\u967d\u6625\u7684Query Builder\uff08\u5e6b\u4f60\u6253\u9020SQL query\u7684\u52a9\u624b\uff09\u800c\u5df2\u3002<\/p>\n
CodeIgniter’s “Active Record” isn’t what the real active record is all about.
\n<\/a><\/p>\n
You’re also being lead astray by CI’s rather confusing name ActiveRecord, which actually doesn’t implement the ActiveRecord pattern.
\n<\/a><\/p>\n
CodeIgniter has a query builder it calls “ActiveRecord”, but which does not implement the Active Record pattern.
\n<\/a><\/p>\n
CI\u7684\u72d7\u5c41Active Record\u5c31\u662f\u4e00\u500b\u5c0d\u4f7f\u7528\u8005\u6709\u5bb3\u3001\u6df7\u6dc6\u89c0\u5ff5\u3001\u6c92\u4eba\u8981\u9ede\u7834\u3001<\/p>\n
\u5927\u5bb6\u4e0d\u6c42\u751a\u89e3\u3001\u70ba\u4e86\u884c\u92b7\u800c\u5b58\u5728\u7684\u5783\u573e\u540d\u8a5e\u3002<\/p>\n
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Q2: \u6211\u6574\u7bc7\u6587\u7ae0\u90fd\u770b\u4e0d\u592a\u61c2\uff0c\u6211\u73fe\u5728\u66f4\u7dca\u5f35\u4e86\u3002
\n<\/em><\/strong>
\n\u5225\u6025\uff0c\u6162\u6162\u4f86\u3002OOP\u8981\u5beb\u5f97\u512a\u96c5\uff0c\u672c\u4f86\u5c31\u975e\u5e38\u4e0d\u5bb9\u6613\u3002<\/p>\n
\u6709\u7a7a\u53bb\u6478\u6478\u770bLaravel<\/a>\u5427\uff0c\u611f\u53d7\u4e00\u4e0b\uff0c\u4e5f\u8a31\u6703\u6709\u9748\u611f\u3002<\/p>\n
\u6709\u554f\u984c\u53ef\u4ee5\u5230Laravel\u53f0\u7063<\/a>\u767c\u554f\u5537\u3002<\/p>\n
\n
\u793e\u7fa4\u770b\u6cd5\uff082015-4-6\uff09<\/h3>\n
PHP\u53f0\u7063<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
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