不要在Laravel中顯示空父類別

Question

我在頁面上有父類別和子類別。我想要做的是當沒有產品，並且某些父類別中沒有分配的子類別不會顯示在頁面上時。

所以我有這樣的分類模型

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

public function children() 
{ 
    return $this->hasMany('App\Category', 'parent_id'); 
} 


public function getCategories() 
{ 
    $categoires = Category::where('parent_id',0)->get(); 
    $categoires = $this->addRelation($categoires); 
    return $categoires; 
} 

public function selectChild($id) 
{ 
    $categoires = Category::where('parent_id',$id)->where('published', 1)->get(); 
    $categoires = $this->addRelation($categoires); 
    return $categoires; 
} 

這在控制器

public function index() 
{ 
    $Category = new Category; 
    $allCategories = $Category->getCategories(); 
    return view('frontend.home', compact('allCategories', 'unviewedMessagesCount')); 
} 

這對葉片視圖

@foreach($allCategories as $category) 
    {!!$category->title!!} ({!! $category->itemCount!!}) 
    <p class="card-text"> 
     @foreach($category->subCategory as $subcategory) 
     {!!$subcategory->title!!} {!! $subcategory->itemCount !!} 
     @endforeach 
    </p> 
    <a href="{!!route('list',array($category->id))!!}" class="btn btn-primary">View Category</a> 
@endforeach 

這是在類別中的記錄樣本表中有列

id | title  | parent 
1 Main cat  0 
2 Sub-Cat  1 
3 Sub-Cat 2 1 
4 Main cat 2 0 

因此每個親本是0，並且每個子（子類）具有父ID

item表也參照category表 - >列category_id

我不能計算出來如何如果沒有項目，並且沒有孩子，則不要在頁面上顯示它。

Answer 1

在控制器

$allCategories = Category::where('parent_id', 0)->has('children.item') 
       ->with(['children'=> function($query){ 
        $query->withCount('item'); 
       }]) 
       ->get() 
       ->each(function($parentCategory){ 
        // if you wants calculate sum child category item count and assign to parent category item_count. 
        $parentCategory->item_count = $parentCategory->children->sum(function ($child) { return isset($child->item_count)?$child->item_count:0;}); 
       }); 
return view('frontend.home', compact('allCategories')); 

在此查詢中只有一個查詢將被執行，並返回您的所有需求。

並在刀片查看文件

@foreach($allCategories as $category) 
    {!!$category->title!!} ({!! $category->item_count!!}) 
    <p class="card-text"> 
    @foreach($category->children as $subcategory) 
     {!!$subcategory->title!!} {!! $subcategory->item_count !!} 
    @endforeach 
    </p> 
    <a href="{!!route('list',array($category->id))!!}" class="btn btn-primary">View Category</a> 
@endforeach