Question

我正在尝试在此菜单中显示与相关类别相关的子类别firsrt类别已显示，但我必须显示相关类别的替代文字？

数据库

控制器

public function index(){
     $category=DB::table('category')->where('p_id',0)->get();
     return view('front_end/index',compact('category'));
}

html视图

            <div class="nav-panel__nav-links nav-links">
            <ul class="nav-links__list">
            @foreach($category as $firstmenu)
               <li class="nav-links__item  nav-links__item--has-submenu ">
                <a id="cate" class="nav-links__item-link" href=" 
               {{$firstmenu->cate_name}}">
               <div class="nav-links__item-body">
               {{$firstmenu->cate_name}}
               <svg class="nav-links__item-arrow" width="9px" height="6px">
                <use xlink:href="public/assets/images/sprite.svg#arrow-rounded-down-9x6"></use>
                </svg>
                </div>
                </a>
                 <div class="nav-links__submenu nav-links__submenu--type--megamenu nav-links__submenu-- 
                 size--nl">
                   <!-- .megamenu -->
                   <div class="megamenu ">
                   <div class="megamenu__body">
                  <div class="row">
                     <div class="col-6">
                        <ul class="megamenu__links megamenu__links--level--0">
                           <li class="megamenu__item  megamenu__item--with-submenu ">
                                  /sub category /
                              <a href="">T-shirts</a>
                              <ul class="megamenu__links megamenu__links--level--1">
                                       /sub category /                               
                                 <li class="megamenu__item"><a href="">short paint</a>
                                 </li>
                              </ul>
                           </li>
                        </ul>
                     </div>
                  </div>
               </div>
            </div>
            <!-- .megamenu / end -->
         </div>
      </li>
      @endforeach
   </ul>
</div>

Answer 1

因此，首先，您需要以某种方式获取此子类别。您可以使用雄辩的关系（如果已定义）或简单的连接，如下所示：

数据库查询：

$category = DB::table('category')                                              
           ->join('subcategory', 'subcategory.category_id', '=','category.id') 
           ->where('p_id',0)                                                
           ->get();

口才（如果类别具有多个子类别）：

类别模型：

public function subcategory()
{
    return $this->hasMany(SubCategory::class, 'category_id', 'id');
}

控制器

$category = Category::with('subcategory')->get();

然后仅查看视图中子类别的名称或其他值（重要-如果与您的类别相关的子类别可能不止一个，则必须使用循环遍历所有子类别）：

 {{$category->subcategory->name}}

或

@foreach($category->subcategory as $sub_cat)
   {{$sub_cat->name}}
@endforeach

有关更多信息，请查看Laravel文档： https://laravel.com/docs/6.x/eloquent-relationships

Answer 2

您已经发布了表格结构

您的关系将像

  public function subCategories(){
        return $this->hasMany(SELF::class, 'p_id', 'id');
    }

    public function parentCategories(){
        return $this->hasMany(SELF::class, 'p_id', 'id');
    }

   public scopeParent($query){
       return $query->whereNull('p_id');
   }
   public scopeChild($query){
       return $query->whereNotNull('p_id');
   }

您应该能够获得类似的类别

$categories = Category::parent()->get();

然后是这样的

foreach($categories->with('subCategories')->get() as $category) {
   foreach($category->subCategories as $subCategory) {
    }
}

如何使用Laravel显示与类别相关的子类别

2 个答案: