Question

我在页面上有父类和子类。我想要做的是当没有产品，并且在某些父类别中没有分配子类别而不在页面上显示。

所以我在分类模型中有这个

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;
}

这在控制器中

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

这在刀片视图上

@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

这是类别表中的记录样本有列

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

因此每个父项为0，每个子项（子类别）都具有父ID

item表还引用了category表 - ＆gt;专栏category_id

如果没有任何项目和没有孩子在页面上显示，我无法弄清楚如何制定条件。

Answer 1

在控制器

中

$allCategories = Category::where('parent_id', 0)->has('children.item')
                ->with(['children'=> function($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'));

在此查询中，只会执行一个查询，它会返回您的所有需求。

在Blade View文件中

@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

不要在Laravel

1 个答案: