未定义的属性：Illuminate\Database\Eloquent\Relations\BelongsTo::$name laravel 5.4

Question

您好，以下是我的关系

用户模型

   public function loginlogout()
    {
        $this->HasMany("App\Models\LoginLogoutLogs");
    }

这是我的 LoginLogoutLogs 模型

  public function users()
    {
        return $this->belongsTo('App\Models\User');
    }

我正在尝试像这样访问用户的名称

 $loginLogoutLogs = LoginLogoutLogs::all();
        foreach($loginLogoutLogs as $loginLogoutLog){
            dd($loginLogoutLog->users()->name);
        }

但我收到此错误

未定义属性：Illuminate\Database\Eloquent\Relations\BelongsTo::$name

编辑添加模型

<?php

namespace App\Models;

use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Zizaco\Entrust\Traits\EntrustUserTrait;
use Session;
use Illuminate\Support\Facades\DB;

class User extends Authenticatable
{
    use Notifiable;
    use EntrustUserTrait;

    protected $table = 'tbl_users';
    protected $primaryKey = 'id';
    protected $guarded = ['id'];
    const API = 'api';
    const WEB = 'web';

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password', 'last_login', 'Address', 'Age', 'DateOfBirth', 'created_by', 'deleted_by'
    ];

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

    protected $casts = [
        'is_admin' => 'boolean',
    ];

    public function isAdmin()
    {
        return $this->is_admin;
    }

    static function GetUserNamebyID($id)
    {
        $name = User::select("name")->where(["id" => $id])->pluck('name');
        if (isset($name[0])) {
            return $name[0];
        } else {
            return '';
        }
    }



    public function loginlogout()
    {
        $this->HasMany("App\Models\LoginLogoutLogs", 'userID');
    }

    public function company()
    {
        $this->HasMany("App\Models\Company");
    }
}

现在是 LoginLogouts 模型

<?php


namespace App\Models;

use Illuminate\Notifications\Notifiable;
use Zizaco\Entrust\Traits\EntrustUserTrait;
use Illuminate\Database\Eloquent\Model;
use Session;
use Illuminate\Support\Facades\DB;

class LoginLogoutLogs extends Model
{
    use Notifiable;
    use EntrustUserTrait;

    protected $table = 'tbl_users_logs';
    protected $primaryKey = 'id';
    protected $guarded = ['id'];
    const API = 'api';
    const WEB = 'web';


    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'userID','is_accpeted','type','addedFrom'
    ];

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

    protected $casts = [
        'is_admin' => 'boolean',
    ];

    public function isAdmin()
    {
        return $this->is_admin;
    }

    // change company to hasmany

    public function user()
    {
        return $this->belongsTo('App\Models\User');
    }

}

Answer 1

只需改变你的部分

dd($loginLogoutLog->users()->name);

进入

dd($loginLogoutLog->users->name);

移除用户的支架，它很容易修复。 这里我们获得的是一个属性，而不是一个函数......（虽然在模型中它被定义为函数）

Answer 2

在获取child 模型时删除()，并为belongsTo 添加第二个参数。

你在这里：

迁移：

// Parent migration (create_clients_table):
Schema::create('clients', function (Blueprint $table) {
  $table->unsignedBigInteger('user_id');
  $table->foreign('user_id')
      ->references('id')
      ->on('users')
      ->onDelete('cascade');
});

// Child migration (create_payments_table):
Schema::create('payments', function (Blueprint $table) {
  $table->unsignedBigInteger('client_id');
  $table->foreign('client_id')
      ->references('id')
      ->on('clients')
      ->onDelete('cascade');
});

模型关系：

// Child (Client Model)
public function owner()
{
  return $this->belongsTo(User::class, 'user_id');
}

// Parent (User Model)
public function clients()
{
  return $this->hasMany(Client::class);
}

数据输出：

// Route:
Route::get('/client/{id}/payments', [PaymentController::class, 'paymentsOfClient']);


// In controller (PaymentController):
/**
 * Display a listing of the payments of specified Client.
 *
 * @param  string  $id
 * @return \Illuminate\Http\Response
 */
public function paymentsOfClient($id)
{
    $client = Client::find($id);

    // check permissions
    if (auth()->user()->id !== $client->owner->id) {
        return;
    }

    $payments = $client->payments()->paginate(20);
    return response()->json($payments);
}

Answer 3

简单修复：

$loginLogoutLogs = LoginLogoutLogs::all();
foreach($loginLogoutLogs as $loginLogoutLog){
    dd($loginLogoutLog->users->name);
}

您想要访问关系实体，而不是关系模型。

通过使用users()，您的代码认为您正在尝试在users 模型上调用name() 方法，而不是在LoginLogoutLogs 类上调用users 方法。

Answer 4

您需要更改与用户的关系，在LoginLogoutLogs 中添加外键：

public function user()
{
    return $this->belongsTo('App\Models\User', 'userID');
}

还要确保你调用 user insted of users

$loginLogoutLogs = LoginLogoutLogs::all();
foreach($loginLogoutLogs as $loginLogoutLog){
    dd($loginLogoutLog->user->name);
}

如果你想执行预加载：

$loginLogoutLogs = LoginLogoutLogs::with('user')->get();
foreach($loginLogoutLogs as $loginLogoutLog){
    dd($loginLogoutLog->user->name);
}