只有當產品帶有Laravel時，才能在菜單上顯示子類別

Question

我有一個簡單的查詢，它用主類別和子類別填充菜單。這項工作非常

// in controller 
$cat=Categories::all(); 
View::share('categories_menu',$cat); 

// in view 
@foreach($categories_menu as $category_menu) 
    @if($category_menu->has('subcategories')) 
     <ul class="nav nav-stacked cat-nav"> 
       <li> 
        <a href="#">{{ $category_menu['category_name'] }} </a> 
         @if($category_menu->subcategories->count()) 
          <ul> 
          @foreach($category_menu->subcategories as $subcategory) 
           <li class=""><a href="#">{{$subcategory->sub_cat_name}}</a></li> 
          @endforeach 
          </ul> 
         @endif 
       </li> 
      @else 
       <li><a href="#"><i class="fa fa-link"></i> <span>{{ $category_menu->category_name }}</span></a></li> 
      @endif 
     </ul> 
@endforeach 

本作輸出像

Main Category 
    -Sub Cat 
    -Sub Cat 
Second main category 
    -Sub in second main category 
    ... 

的問題是，它是裝也分類別，其是空的。我不想告訴他們，我試圖與加入所有三個表更改查詢 - category，sub_categories，products

這是查詢到目前爲止

$cat = Categories::select('*', DB::raw('category.category_id AS category_id')) 
    ->leftJoin('products', function($join) { 
      $join->on('products.category_id', '=', 'category.category_id'); 
      }) 
    ->leftJoin('sub_category', function($secondjoin){ 
      $secondjoin->on('sub_category.category_id', '=', 'category.category_id'); 
      }) 
    ->whereNotNull('products.sub_cat_id') 
    ->get(); 

結果是怪（圖）

它應該顯示我只有兩個主要類別，每個都有一個子。在圖像，你可以看到我的產品表

Category 1 
    -sub1 
Category 2 
    -sub3 

如果需要一些更多的源或東西我可以提供。

更新配車型：

分類模型

class Categories extends Eloquent { 
    protected $table = 'category'; 
    protected $primaryKey = 'category_id'; 

    public $timestamps = false; 

    public function products() 
    { 
     return $this->hasMany('Product', 'category_id'); 

    } 
    public function subcategories() 
    { 
     return $this->hasMany('SubCategories', 'category_id'); 
    } 
} 

小類模型

class SubCategories extends Eloquent { 
    protected $table = 'sub_category'; 
    protected $primaryKey = 'sub_cat_id'; 

    public $timestamps = false; 

    public function category() 
    { 
     return $this->belongsTo('Category', 'category_id'); 
    } 

    public function products() 
    { 
     return $this->hasMany('Product', 'sub_cat_id'); 
    } 
} 

產品型號

class Product extends Eloquent { 
    protected $table = 'products'; 
    protected $primaryKey = 'product_id'; 

    public function categories() 
    { 
     return $this->hasMany('Categories', 'category_id'); 
    } 

    public $timestamps = false; 
} 

Answer 1

@foreach($categories_menu as $category_menu) 
    @if($category_menu->has('subcategories')) 
     <ul class="nav nav-stacked cat-nav"> 
       <li> 
        <a href="#">{{ $category_menu['category_name'] }} </a> 
         @if($category_menu->subcategories->count()) 
          <ul> 
          @foreach($category_menu->subcategories as $subcategory) 
           @if($subcategory->products->count()) 
           <li class=""><a href="#">{{$subcategory->sub_cat_name}}</a></li> 
           @endif 
          @endforeach 
          </ul> 
         @endif 
       </li> 
      @else 
       <li><a href="#"><i class="fa fa-link"></i> <span>{{ $category_menu->category_name }}</span></a></li> 
      @endif 
     </ul> 
@endforeach 

我添加了一個條件subcatergy要顯示，只有當他們的產品計數是在0以上