如何在 "类别 "下拉列表中显示子类别？

Question

在我的代码中，我想显示 种类 和 子类 的类别下 产品表.

喏 是我 类别表

1.

 public function up() { Schema::create('categories', function (Blueprint $table) {

    $table->increments('id');
    $table->integer('parent_id'); 
    $table->string('name');  
    $table->rememberToken();
    $table->timestamps();

    });
}

这里 是我 产品表

2.

public function up()
{
    Schema::create('products', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('category_id');
        $table->string('product_name');
        $table->string('product_code');
        $table->timestamps();
    });
}

2. 这里 是我 类别模型

3.Category.php

<?php
namespace App;

use Illuminate\Database\Eloquent\Model;

class Category extends Model { protected $guarded=[];

public function products(){
    return $this->hasMany('App\Product');
}

喏 是我 产品型号

4.Product.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Product extends Model
{
    public function category(){
        return $this->hasone('class::Category');
    }

}

现在是我的 ProductController.php

5.ProductController.php

<?php

namespace App\Http\Controllers;

use App\Category;
use App\Product;
use Session;
use Illuminate\Http\Request;

class ProductsController extends Controller
{

     public function addproduct(Request $request){
         $product=New Product();
         $product->category_id=$request['category_id'];
         $product->product_name=$request['product_name'];
         $product->product_code=$request['product_code'];
         $product->status = request('status');
         $product->save();
         return back()->with('success','product Upload Successfully!');

         }
}

这是我的 添加产品.刀片.php 档案

6.addproduct.blade.php

<form class="form-horizontal" method="post" action="{{route('add.product')}}" name="add_product" id="add_product" novalidate="novalidate">
                                @csrf

                                <div class="control-group">
                                    <label class="control-label">main Category </label>
                                    <div class="controls">
                                        <select name="category_id" id="category_id" style="width:220px;">

                                            <option value="0">Main Category</option>
                                            @foreach(App\Category::all() as $cat)
                                                <option value="{{$cat->id}}" >{{$cat->name}}</option>
                                            @endforeach

                                        </select>
                                    </div>
                                </div>


                                <div class="control-group">
                                    <label class="control-label">Product Name</label>
                                    <div class="controls">
                                        <input type="text" name="product_name" id="product_name">
                                    </div>
                                </div>

                                <div class="control-group">
                                    <label class="control-label">Product Code</label>
                                    <div class="controls">
                                        <input type="text" name="product_code" id="product_code">
                                    </div>
                                </div>

                                <div class="control-group">
                                    <label class="control-label">Product Color</label>
                                    <div class="controls">
                                        <input type="text" name="product_color" id="product_color">
                                    </div>
                                </div>


                                <div class="form-actions">
                                    <input type="submit" value="submit" class="btn btn-success">
                                </div>

                            </form>

7. 我想要这样的数据

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Answer 1

在你的分类模型中

class Category extends Model { protected $guarded=[];

    public function products(){
        return $this->hasMany('App\Product');
    }

    public function parent(){
        return $this->belongsTo('App\Category');
    }
}

在你的刀刃上

@foreach(App\Category::all() as $cat)
    <option value="{{$cat->id}}" >{{ isset($cat->parent->name) ? $cat->parent->name . ' -- ' : '' }}{{$cat->name}}</option>
@endforeach

Ps: 对于你的发展。你应该在叶片中使用变量，而不是模型。所以像这样的装箱变量 $categories = Category::all(); 并在您的控制器的index方法中传递给视图，并在 blade中使用。