類別和子類別不是在laravel編輯產品時獲取5.3

Question

我正在嘗試更新我的產品，但因爲我必須從數據庫中提取所有數據，並且所有工作都很好，所以期望的類別和子類別不會顯示在選擇框中。

這裏是我的刀片文件代碼

   <div class="form-group"> 
        <label>Brand</label> 
        <select class="form-control" name="brand_id" id="brand_id"> 
         <option value=""></option> 
         @foreach($brands as $brand) 
          <option value="{{ $brand->id }}" {{ $product->brand_id == $brand->id ? "selected" : "" }}>{{ $brand->brand_name }}</option> 
         @endforeach 
        </select> 

       </div> 


       <div class="form-group"> 
       <label>Parent Category</label> 
         <select class="form-control" name="category" id="category" data-url="{{ url('api/dropdown')}}" > 

          @foreach($categories as $category) 
           <option value="{{ $category->id }}" {{$category->category}}</option> 
          @endforeach 
         </select> 


        <br> 
       </div> 


        <div class="form-group"> 
         <label>Sub-Category Category</label> 
         <select class="form-control" name="cat_id" id="sub_category"> 
          <option value=""></option> 
         </select> 
         @if($errors->has('cat_id')) 
          <span class="help-block">{{ $errors->first('cat_id') }}</span> 
         @endif 
        </div> 
        <br> 

這裏是我的產品控制器

public function categoryAPI() { 
    // Get the "option" value from the drop-down. 
    $input = Input::get('option'); 

    // Find the category name associated with the "option" parameter. 
    $category = Category::find($input); 

    // Find all the children (sub-categories) from the parent category 
    // so we can display then in the sub-category drop-down list. 
    $subcategory = $category->children(); 

    // Return a Response, and make a request to get the id and category (name) 
    return \Response::make($subcategory->get(['id', 'category'])); 
} 
public function editProducts($id) { 



    $product = Product::where('id', '=' , $id)->find($id); 
    $categories = Category::whereNull('parent_id')->get(); 
    $brands = $this->brandsAll(); 
    return view('admins.products.editproducts',compact('product','categories','brands')); 

} 

這裏是我的產品型號

<?php 

namespace App; 

use App\ProductPhoto; 
use App\Brand; 
use App\Category; 
use Illuminate\Database\Eloquent\Model; 

class Product extends Model { 

protected $table = 'products'; 

protected $fillable = [ 
    'product_name', 
    'product_qty', 
    'product_sku', 
    'price', 
    'reduced_price', 
    'cat_id', 
    'featured', 
    'brand_id', 
    'description', 
    'product_spec', 
]; 

//protected $gaurded = ['id']; 


/** 
* One Product can have one Category. 
* 
* @return \Illuminate\Database\Eloquent\Relations\HasOne 
*/ 
public function category() { 
    return $this->hasOne('App\Category', 'id'); 
} 


// do same thing above for category() if you want to show what category a certain product is under in products page. 

/** 
* A Product Belongs To a Brand 
* 
* @return \Illuminate\Database\Eloquent\Relations\HasOne 
*/ 
public function brand() { 
    return $this->belongsTo('App\Brand'); 
} 


/** 
* Save a Product to the ProductPhoto instance. 
* 
* @param ProductPhoto $ProductPhoto 
* @return Model 
*/ 
public function addPhoto(ProductPhoto $ProductPhoto) { 
    return $this->photos()->save($ProductPhoto); 
} 


/** 
* One Product can have many photos. 
* 
* @return \Illuminate\Database\Eloquent\Relations\HasMany 
*/ 
public function photos() { 
    return $this->hasMany('App\ProductPhoto'); 
} 


/** 
* Return a product can have one featured photo where "featured" column = true (or 1) 
* 
* @return mixed 
*/ 
public function featuredPhoto() { 
    return $this->hasOne('App\ProductPhoto')->whereFeatured(true); 
} 


/** 
* Show a product when clicked on (Admin side). 
* 
* @param $id 
* @return mixed 
*/ 
public static function LocatedAt($id) { 
    return static::where(compact('id'))->firstOrFail(); 
} 


/** 
* Show a Product when clicked on. 
* 
* @param $product_name 
* @return mixed 
*/ 
public static function ProductLocatedAt($product_name) { 
    return static::where(compact('product_name'))->firstOrFail(); 
} 


} 

這裏是我的類模型

<?php 

namespace App; 

use App\Product; 
use Illuminate\Database\Eloquent\Model; 

class Category extends Model { 

protected $table = 'categories'; 

protected $fillable = ['category']; 

//protected $guarded = ['id']; 


/** 
* One sub category, belongs to a Main Category (Or Parent Category). 
* 
* @return \Illuminate\Database\Eloquent\Relations\BelongsTo 
*/ 
public function parent() { 
    return $this->belongsTo('App\Category', 'parent_id'); 
} 


/** 
* A Parent Category has many sub categories 
* 
* @return \Illuminate\Database\Eloquent\Relations\HasMany 
*/ 
public function children() { 
    return $this->hasMany('App\Category', 'parent_id'); 
} 


/** 
* One Category can have many Products. 
* 
* @return \Illuminate\Database\Eloquent\Relations\HasMany 
*/ 
public function product() { 
    return $this->hasMany('App\Product', 'id'); 
} 


/** 
* Delete all sub categories when Main (Parent) category is deleted. 
*/ 
public static function boot() { 
    // Reference the parent::boot() class. 
    parent::boot(); 

    // Delete the parent and all of its children on delete. 
    //static::deleted(function($category) { 
    // $category->parent()->delete(); 
    // $category->children()->delete(); 
    //}); 

    Category::deleting(function($category) { 
     foreach($category->children as $subcategory){ 
      $subcategory->delete(); 
     } 
    }); 
} 


} 

這裏是數據庫

這裏是我的產品表數據庫

，這裏是我的網站看看，類別和子類別的心不是我的selcted類別表。

Answer 1

我做到了我需要做的編輯刀片頁面的這個

<div class="form-group"> 
      <label>Parent Category</label> 
        <select class="form-control" name="category" id="category" data-url="{{ url('api/dropdown')}}" > 
         <option value=""></option> 
         @foreach($categories as $category) 
          <option value="{{ $category->id }}" {{$product->Category->parent->id == $category->id ? "selected" : "" }}>{{ $category->category}}</option> 
         @endforeach 
        </select> 


       <br> 
      </div>