Question

我有一对多的产品与书籍的关系。

我的控制器中的功能：

public function editProduct($p_id)
{
   $books = Product::findOrFail($p_id);
   return view('master.editProduct')->with(['books'=>$books]);
}

editProduct.blade.php

<!--Returns Name from product table--> 
<div class="form-group">
  <label>Book Title</label>
  <input type="text" class="form-control" name="name" value = "{{ $books->name }}">
</div>

<!--Should return author from books table-->
<div class="form-group">
  <label>Author</label>
  <input type="text" class="form-control" name="author" " value = "{{ $books->books->author  }}">
</div>

我也尝试过：

$books->books返回了p_id
$books->books->author仅从books表中获取作者但返回错误。我收到错误：此集合实例上不存在属性[author]。如何在我看来从书籍表中获得作者的价值？

产品型号

<?php
namespace App;

use Illuminate\Database\Eloquent\Model;

class Product extends Model
{
   protected $tables= "products";
   protected $primaryKey = 'product_id';
   public $incrementing = false;

   protected $fillable = ['product_id','product_type','name', ...,];

   protected $hidden =['created_at', 'updated_at'];

   public function books(){
    return $this->hasMany('App\Book', 'product_id');
}

}

预订模型

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Book extends Model
{
  protected $tables= "books";

  protected $fillable = ['product_id','author', 'edition',...];

  protected $hidden =['created_at', 'updated_at'];

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

}

EditForm字段

标题
作者
公开。。

标题存储在Products表中，我可以在表单中访问

<div class="form-group">
  <label>Book Title</label>
  <input type="text" class="form-control"  name="name" value = "{{ $books->name }}">
</div>

在同一表格中，不会访问作者。

Answer 1

两个查询解决方案：

$books = Product::find($p_id)->books()->get();

一个查询解决方案：

$books = Book::where('product_id', $p_id)->get();

显示数据：

@foreach ($books as $book)
    {{ $book->name }}
@endforeach

Answer 2

的ProductsController

public function editProduct($p_id){
        $products = Product::with(['books'])->where('product_id', $p_id)->get();

        return view('master.editProduct', compact('products'));
    }

查看我在表单中使用了两个foreach循环来访问产品表中的名称和书表中的作者，如下所示：

@foreach($products as $product) 
  <form>
    ...
        <div class="form-group">
         <label>Book Title</label>
         <input type="text" class="form-control" id="name" name="name" value = "{{ $product->name }}">
        </div>


       @foreach($product->books as $books)
         <div class="form-group">
            <label>Author</label>
            <input type="text" class="form-control" id="author" name="author" " value = "{{ $books->author  }}">
          </div>
       @endforeach
  ...
  </form>
@endforeach

从刀片层级中具有一对多关系的另一个表中访问数据

3 个答案: