显示所选类别

Question

如何在我的 edit.blade.php 中显示我选择的产品类别。您只能选择 1 个类别，因此不是多对多关系。

产品型号：

   public function category(){
    return $this->belongsTo(Category::class);
}

类别模型：

  public function products(){
    return $this->hasMany(Product::class);
}

数据库产品：

<div class="form-group my-2">
 <label for="category">Choose Category  :</label>
 <select name="category_id" class="form-control custom-select">
  @foreach($categories as $category)
   <option value="{{$category->id}}" @if($product->category->contains($category->id)) selected @endif>{{$category->name}}</option>
  @endforeach
 </select>
</div>

我不断收到如下错误：调用未定义的方法 App\Models\Category::contains()

Answer 1

您的产品belongsTo类别：

<option value="{{$category->id}}" @if($product->category_id == $category->id) selected @endif>{{$category->name}}</option>

Answer 2

你可以试试这个

 <option value="{{$category->id}}" {{($product->category_id == $category->id) ? 'selected' : ''}}>{{$category->name}}</option>

Answer 3

Laravel 版本 < 9

<option value="{{ $category->id }}" {{ ($product->category_id == $category->id) ? 'selected' : '' }}>{{ $category->name }}</option>

幼虫版本 > 9

<option value="{{ $category->id }}" @selected($product->category_id == $category->id)>{{ $category->name }}</option>

Ref: https://laravel.com/docs/9.x/blade#checked-and-selected

显示所选类别

Show selected category

laravel