Laravel 5.2 有很多关系 - 无法访问字段

Question

我已经阅读了有关 eloquent 关系的文档以及有关它的在线不同文章。但似乎我很难访问表关系的字段。请指教。

User->hasMany BuyRequest

用户表列：

id,
userid (int),
name

BuyRequest 表列：

id,
buyrequest_id,
userid (int)

这里是我的用户模型的代码，

use Illuminate\Database\Eloquent\Model;
use Illuminate\Foundation\Auth\User as Authenticatable;
use App\BuyRequest;
class User extends Authenticatable
{
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password','userid',
    ];

    /**
     * The attributes excluded from the model's JSON form.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];

    public function buyRequest(){
        return $this->hasMany(BuyRequest::class,'userid','userid');
    }

}

我的 buyRequest 模型代码

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\DB;
use App\User;
class BuyRequest extends Model
{
    //
    protected $table = 'buyrequest';

    protected $fillable = [
        'buyrequest_id'
    ];

}

我正在访问变量的控制器类

<?php

namespace App\Http\Controllers;

use App\User;
use Illuminate\Http\Request;

use App\Http\Requests;
use App\Http\Controllers\Controller;
use App\Http\Requests\ProductPostRequest;
use App\Products;
use Illuminate\Support\Facades\DB;
use App\BuyRequest;
use App\Http\Requests\RFQRequest;
use App\ProductCategory;

class TaskController extends Controller
{

    public function show(Request $request){

        $user = new User();
        $buyrequest = $user->buyRequest();

        dump($buyrequest->getResults());
    }

}

输出：

Collection {#241 ▼
  #items: []
}

我的收藏品为零，我是否可以正确访问购买请求？请帮忙。

我已经在 laravel 文档中尝试过，请参见下文。

$buyrequest1 = User::find(1)->buyrequest;

        foreach ($buyrequest1 as $br) {
            dump($br->title);
        }

我得到这个输出：

试图获取非对象的属性

提前谢谢你。

Answer 1

在您的 BuyRequest 模型中添加列名称 userid，如下所示：

use Illuminate\Database\Eloquent\Model;
use Illuminate\Foundation\Auth\User as Authenticatable;
use App\BuyRequest;
class User extends Authenticatable
{
   /**
   * The attributes that are mass assignable.
   *
   * @var array
   */
   protected $fillable = [
       'name', 'email', 'password','userid',
   ];

    /**
     * The attributes excluded from the model's JSON form.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];

    public function buyRequest(){
        return $this->hasMany(BuyRequest::class,'userid','userid');
    }

}

并按如下方式访问它：

class TaskController extends Controller
{

    public function show(Request $request){

        $user = User::with('buyRequest')->where('userid','1')->firstOrFail();

        dump($user[0]->buyRequest[0]->title);
    }

}

Answer 2

好的，一天之后。我想我找到了我要找的东西。感谢@Nadimul De Cj 帮助我尝试其他选项并帮助我解决问题。

基本上，在您可以访问用户的购买请求之前，您应该首先过滤您要输出的购买请求访问权限。

好的另一种解释，首先使用 where 语句选择您要访问购买请求的用户.....所以，id 等于 1 的用户然后访问他的购买请求。我们不能只使用 user 模型然后直接访问 buyrequest 模型，或者我们可以说这不切实际。

这是代码。

$user = User::where('userid','1')->firstOrFail();
        dump($user->buyrequest['0']->title);

输出： “Cold Pyro 室内表演饼干”

这是我的关系代码。

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Foundation\Auth\User as Authenticatable;
use App\BuyRequest;
class User extends Authenticatable
{

 public function buyRequest(){
        return $this->hasMany(BuyRequest::class,'userid','userid');
    }

}