该集合实例上不存在属性[name] [英] Property [name] does not exist on this collection instance

问题描述

我在数据库中有3个表(用户，区域，区域用户)，

I have 3 tables in DB (users , areas , area_user),

用户表:ID名称用户名密码

Users table: id name username password

区域表:ID名称

area_user表:ID用户身份area_id

area_user table: id user_id area_id

我正在尝试创建一个(列出用户页面)，该页面将显示具有用户分配区域的所有用户表列.

I am trying to create a (List users page) which will show all user table column with user assigned areas.

User.php模型文件

User.php Model file

  <?php

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable{
    use Notifiable;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = ['name', 'email', 'password','role_id',];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = ['password', 'remember_token',];

    public function areas(){
        return $this->belongsToMany('App\Area','area_user');
    }

Area.php模型文件:

Area.php Model file:

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Area extends Model{
    protected $fillable = ['name'];

    public function users(){
        return $this->belongsToMany('App\User','area_user','area_id','user_id');
    }
}

UserController @ index文件:

UserController@index file :

<?php

namespace App\Http\Controllers;

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

class UserController extends Controller{

    public function __construct(){
        // $this->middleware('auth');
    }

    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index(){
        $users = User::get();
        return view('users._list',
        ['users'=> $users]
    );
    }

最后是表格视图文件:-

Finally the table view file:-

@foreach($users as $u)
            <tr role="row" class="odd">
                <td class="sorting_1">{{$u->name}}</td>
                <td></td>
                <td>{{$u->areas]}}</td>
                <td>{{route('show_user', ['id' => $u->id])}}</td>
            </tr></tbody>
@endforeach

如果仅使用area属性($ u-> areas)在用户表视图(分配的区域)中键入，它将显示所有area列:-

If i typed in user table view (assigned areas) with only using the areas property ($u->areas), it will show all the areas column:-

[
  {
    "id": 3,
    "name": "C",
    "location_id": 1,
    "created_at": null,
    "updated_at": null,
    "pivot": {
      "user_id": 4,
      "area_id": 3
    }
  },
  {
    "id": 4,
    "name": "D",
    "location_id": 2,
    "created_at": null,
    "updated_at": null,
    "pivot": {
      "user_id": 4,
      "area_id": 4
    }
  }
]

---

 @foreach($users as $u)
                <tr role="row" class="odd">
                    <td class="sorting_1">{{$u->name}}</td>
                    <td></td>
                    <td>{{$u->areas->name]}}</td>
                    <td>{{route('show_user', ['id' => $u->id])}}</td>
                </tr></tbody>
    @endforeach

请注意，如果我在以上视图的区域"关系中指定列名($ u-> areas-> name)，则会显示错误:-

Notice that if i specify the column name in Areas relationship in the above view ($u->areas->name) , error showing:-

属性[名称]在此集合实例上不存在.(查看:C:\ xampp \ htdocs

Property [name] does not exist on this collection instance. (View: C:\xampp\htdocs

我如何只显示视图文件中的(areas.name)列

How can i show only the (areas.name) column in view file

推荐答案

因为区域是一个集合，所以您应该像这样循环遍历它:

Because the areas is a collection so you should loop over it like this :

@foreach($users as $u)
    <tr role="row" class="odd">
        <td class="sorting_1">{{$u->name}}</td>
        <td></td>
        <td>
        @foreach($u->areas as $area)
            {{$area->name}}, 
        @endforeach
        </td>
        <td>{{route('show_user', ['id' => $u->id])}}</td>
    </tr></tbody>
@endforeach

例如，如果您想用逗号将它们分开，则可以这样进行而无需循环:

And if you want to separate them whith comma for example you can do it like that without looping :

    @foreach($users as $u)
    <tr role="row" class="odd">
        <td class="sorting_1">{{$u->name}}</td>
        <td></td>
        <td>
            {{ $u->areas->pluck('name')->implode(', ') }}
        </td>
        <td>{{route('show_user', ['id' => $u->id])}}</td>
    </tr></tbody>
@endforeach

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