调用未定义的方法(laravel 5.2) [英] Call to undefined method (laravel 5.2)

问题描述

我想显示用户的朋友.但我收到以下错误:

I want to display friends of the user. But I am getting the following error:

Builder.php第2345行中的BadMethodCallException:调用未定义 方法Illuminate \ Database \ Query \ Builder :: friends()

BadMethodCallException in Builder.php line 2345: Call to undefined method Illuminate\Database\Query\Builder::friends()

FriendController:

FriendController:

 <?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\Http\Requests;

use App\User;

use Auth;

class FriendController extends Controller
{
   public function getIndex(){
    $friends=Auth::user()->friends();
    return view('friends',['friends'=>$friends]);
   }
}

路线:

Route::get('/friends',[
'uses' => 'FriendController@getIndex',
'as' => 'friends',
'middleware' => 'auth:web'
]);

用户模型:

public function getName(){
    if($this->firstname && $this->lastname){
        return "{$this->firstname} {$this->lastname}";
    }
    if($this->firstname)
        return $this->firstname;
    return null;
}

public function getNameOrUsername(){
    return $this->getName() ?: $this->username;
}

public function getFirstNameOrUsername() {
    return $this->firstname ?: $this->username;
}

我的观点:

<div  id="grp" class="panel-heading">
  <h3 id="grouptitle" class="panel-title">Your Friends</h3>
  @if(!$friends->count())
  <p>you have no friends</p>
  @else
  @foreach($friends as $user)
  @include('userblock')
  @endforeach
  @endif
</div>

userblock.blade:

userblock.blade:

<div class="media">
<a href="{{ route('myplace', ['username'=>$user->username]) }}" class="pull-left">
    <img src="" class="media-object" alt="{{ $user->getNameOrUsername() }}">
</a>
<div class="media-body">
    <h4 class="media-heading"><a href="#">{{ $user->getNameOrUsername() }}</a></h4>

</div>

推荐答案

您似乎在user模型中作为用户与其好友(再次是用户)之间存在许多关系.因此，我们可以使用方法以Users检索所选用户的朋友.
为此，请将以下功能添加到您的User模型中.

It seems like you are having many to many relationship between user model as user and its friends(again a user).So, we can use belongsToMany() method to retrieve the friends of selected user as Users.
To do so, add the following function to your User model.

public function friends(){
    return $this->belongsToMany('App\User::class','friends','user_id','friend_id')->withPivot('accepted');
}

要获取当前登录用户的朋友，请使用以下命令:

To get the friends of currently loged in User use following:

$friends = Auth::user()->friends()->get();

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