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laravel - Laravel 多对多关系不起作用

问题描述

我在 Laravel 关系中遇到了一个奇怪的问题。

我想访问一个有很多用户的活动（完美）。

<?php

$event_with_user = Event::with('registered_users')->where('id', 253)->get();
dd($event_with_user);

我想访问所有连接事件的用户：

<?php

$user_with_event = User::with('registered_events')->where('id', 1)->get();
        dd($user_with_event);

我总是收到此错误：

Illuminate\Database\Eloquent\RelationNotFoundException “调用模型 [App\User] 上的未定义关系 [registered_events]。”

我多次检查关系，但找不到错误。还有其他人有这个问题吗？

我的模特

用户.php

<?php

namespace App;

use App\Event;
use App\UserType;
use App\EventUser;
use App\Department;
use App\Evaluation;
use App\UserLocation;
use Illuminate\Notifications\Notifiable;
use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    use Notifiable;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'fname', 'lname', 'email', 'password', 'phone', 'email_verified_at', 'admin', 'user_type_id', 'last_login_at', 'last_login_ip', 'user_location_id', 'user_notification_type_id', 'user_notification_setting_id', 'slack_user_id', 'joinpoints_user_id'
    ];

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

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'email_verified_at' => 'datetime',
    ];

    public function registered_events() 
    {
        return $this->belongsToMany(Event::class, 'event_user', 'event_id', 'user_id'); 
    }


}

事件.php

<?php

namespace App;

use App\User;
use App\EventRoom;
use App\EventType;
use App\EventStatus;
use App\EventLocation;
use App\EventParticipant;
use App\EventParticipantItems;
use Illuminate\Database\Eloquent\Model;
use Cviebrock\EloquentSluggable\Sluggable;

class Event extends Model
{
    use Sluggable;

    protected $fillable = [
        'event_type_id', 'user_id', 'status', 'customer', 'slug', 'datetime', 'duration','embed_chat','number_of_participants','heading', 'description_1', 'description_2', 'livestream_link', 'logo_link', 'event_password', 'participants_per_room', 'youtube_id', 'embed_code', 'session_link', 'hide_breakout', 'help_link', 'lang', 'layout', 'btn2_text', 'btn2_link', 'help_text', 'background_url', 'black_font',
    ];

    protected $dates = ['datetime'];

    public function getRouteKeyName()
    {
        return 'slug';
    }

    /**
     * Return the sluggable configuration array for this model.
     *
     * @return array
     */
    public function sluggable()
    {
        return [
            'slug' => [
                'source' => 'customer'
            ]
        ];
    }

    public function registered_users() 
    {
        return $this->belongsToMany(User::class, 'event_user', 'user_id', 'event_id')->withPivot('id', 'user_status', 'eventmanager', 'created_at', 'updated_at');
    }

  
}

我的表：

标签： laraveleloquent

解决方案

看起来你交换了（外）键：

在User.php中：

public function registered_events() 
{
    return $this->belongsToMany(Event::class, 'event_user', 'user_id', 'event_id'); 
}

在Event.php 中：

public function registered_users() 
{
    return $this->belongsToMany(User::class, 'event_user', 'event_id', 'user_id')->withPivot('id', 'user_status', 'eventmanager', 'created_at', 'updated_at');
}

当您遵循正确的 Laravel 数据库结构时，您可以简单 地return $this->belongsToMany(Event::class);放入User.php和 return $this->belongsToMany(User::class)->withPivot(...);Event.php

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