從一個有很多關係構建多級數組

Question

我在Laravel 5.2中構建了一個基本的CMS。

我有'網頁'模型。這種模式有一個「有很多」與自己的關係作爲一個頁面可以有很多子頁面和子頁面可以有很多子子頁面等

我的模型被定義爲這樣的：

class Page extends Model 
{ 
    public function children() 
    { 
     return $this->hasMany('App\Page', 'page_parent'); 
    } 
} 

我數據庫是像這樣

+----+-----------------+------------------------+------------+-------------+ 
| id | title   | description   | project_id | page_parent | 
+----+-----------------+------------------------+------------+-------------+ 
| 1 | Overview  | The overview page  |   1 |   0 | 
| 2 | Overview sub | Child page    |   1 |   1 | 
| 3 | Very young page | This is the kiddy page |   1 |   2 | 
+----+-----------------+------------------------+------------+-------------+ 

然後在我的控制，我有：

public function index() 
{ 
    $pages = Page::with('children')->get(); 
    return Response()->json($pages, 200); 
} 

這裏做的事情： 這將返回頁面不如預期，但是，頁面是唯一一個深一個層次的「孩子」的對象，像這樣的水平：

[ 
    { 
     "id":1, 
     "title":"Overview", 
     "description":"The overview page", 
     "project_id":"1", 
     "page_parent":"0", 
     "children":[ 
     { 
      "id":2, 
      "title":"Overview sub", 
      "description":"Child page", 
      "project_id":"1", 
      "page_parent":"1", 
     } 
     ] 
    }, 
    { 
     "id":2, 
     "title":"Overview sub", 
     "description":"Child page", 
     "project_id":"1", 
     "page_parent":"1", 
     "children":[ 
     { 
      "id":3, 
      "title":"Very young page", 
      "description":"This is the kiddy page", 
      "project_id":"1", 
      "page_parent":"2" 
     } 
     ] 
    }, 
    { 
     "id":3, 
     "title":"Very young page", 
     "description":"This is the kiddy page", 
     "project_id":"1", 
     "page_parent":"2", 
     "children":[ 

     ] 
    } 
    ] 

我想要什麼 會是什麼對於我的前端開發者來說更​​好的是隻有一個根JSON對象（頂層頁面），然後將'子對象'遞歸到其自身中以構建如此的頁面的多級樹：

[ 
{ 
     "id":1, 
     "title":"Overview", 
     "description":"The overview page", 
     "project_id":"1", 
     "page_parent":"0", 
     "children":[ 
     { 
      "id":2, 
      "title":"Overview sub", 
      "description":"Child page", 
      "project_id":"1", 
      "page_parent":"1", 
      "children":[ 
      { 
       [ 
       "id":3, 
       "title":"Very young page", 
       "description":"This is the kiddy page", 
       "project_id":"1", 
       "page_parent":"2", 
       "children":[ 

       ] 
       ] 
      } 
      ] 
     } 
     ] 
    }, 
] 

我可以想到一些黑客的方法，但想知道什麼是最好的'Laravel方式'。我應該使用訪問器還是類似的東西？

感謝

Answer 1

你可以這樣說：

$pages = Page::with('children')->get()->toJson(); 

這也適用於：

$pages = Page::with('children')->get()->groupBy('page_parent')->toJson();