因此,我从Laravel收到以下错误：

SQLSTATE[42000]: Syntax error or access violation: 1066 Not unique table/alias: 'participants' (SQL: select `participants`.*, `participants`.`message_id` as `pivot_message_id`, `participants`.`user_id` as `pivot_user_id`, `participants`.`created_at` as `pivot_created_at`, `participants`.`updated_at` as `pivot_updated_at` from `participants` inner join `participants` on `participants`.`id` = `participants`.`user_id` where `participants`.`deleted_at` is null and `participants`.`message_id` in (2))

我的消息/参与者关系如下所示：

public function participants()

{

return $this->belongsToMany('Namespace\Modules\Email\Models\Participant', 'participants', 'message_id', 'user_id')->withTimestamps();

}

我试图这样称呼它：

public function getAllMessages()

{

return Message::with('user')->with('participants')->get();

}

为什么会出现此错误？到底是怎么回事？

编辑：包括完整模型

信息

????????消息扩展口才

????{

????????使用PublishedTrait;

????????使用SoftDeletingTrait;

/**

* The database table used by the model.

*

* @var string

*/

protected $table = 'messages';

/**

* The attributes that can be set with Mass Assignment.

*

* @var array

*/

protected $fillable = ['subject', 'user_id', 'body', 'status'];

/**

* The attributes that should be mutated to dates.

*

* @var array

*/

protected $dates = ['created_at', 'updated_at', 'deleted_at'];

/**

* Validation rules.

*

* @var array

*/

protected $rules = [

'subject' => 'required|max:255',

'body' => 'required',

];

/**

* User relationship

*

* @return \Illuminate\Database\Eloquent\Relations\BelongsTo

*/

public function user()

{

return $this->belongsTo(Config::get('email.user_model'));

}

public function assets()

{

return $this->belongsToMany('Namespace\Modules\Assets\Models\Asset', 'message_assets');

}

/**

* Participants relationship

*

* @return \Illuminate\Database\Eloquent\Relations\HasMany

*/

public function participants()

{

return $this->belongsToMany('Namespace\Modules\Email\Models\Participant', 'participants', 'message_id', 'user_id')->withTimestamps();

}

/**

* Recipients of this message

*

* @return \Illuminate\Database\Eloquent\Relations\HasMany

*/

public function recipients()

{

return $this->participants()->where('user_id', '!=', $this->user_id);

}

/**

* Returns the latest message from a thread

*

* @return Namespace\Modules\Email\Models\Message

*/

public function getLatestMessageAttribute()

{

return $this->messages()->latest()->first();

}

/**

* Returns threads that the user is associated with

* @param $query

* @param $userId

* @return mixed

*/

public function scopeForUser($query, $userId)

{

return $query->join('participants', 'messages.id', '=', 'participants.message_id')

->where('participants.user_id', $userId)

->where('participants.deleted_at', null)

->select('messages.*');

}

/**

* Returns threads that the user is associated with

* @param $query

* @param $userId

* @return mixed

*/

public function scopeForUserWithDeleted($query, $userId)

{

return $query->join('participants', 'messages.id', '=', 'participants.message_id')

->where('participants.user_id', $userId)

->select('messages.*');

}

/**

* Returns messages that the user has sent

* @param $query

* @param $userId

* @return mixed

*/

public function scopeByUser($query, $userId)

{

return $query->where('user_id', $userId);

}

/**

* Returns threads with new messages that the user is associated with

* @param $query

* @param $userId

* @return mixed

*/

public function scopeForUserWithNewMessages($query, $userId)

{

return $query->join('participants', 'messages.id', '=', 'participants.message_id')

->where('participants.user_id', $userId)

->whereNull('participants.deleted_at')

->where(function ($query) {

$query->where('messages.updated_at', '>', $this->getConnection()->raw($this->getConnection()->getTablePrefix() . 'participants.last_read'))

->orWhereNull('participants.last_read');

})

->select('messages.*');

}

}

参加者

class Participant extends Eloquent

{

use SoftDeletingTrait;

/**

* The database table used by the model.

*

* @var string

*/

protected $table = 'participants';

/**

* The attributes that can be set with Mass Assignment.

*

* @var array

*/

protected $fillable = ['message_id', 'user_id', 'last_read'];

/**

* The attributes that should be mutated to dates.

*

* @var array

*/

protected $dates = ['created_at', 'updated_at', 'deleted_at', 'last_read'];

/**

* Thread relationship

*

* @return \Illuminate\Database\Eloquent\Relations\BelongsTo

*/

public function message()

{

return $this->hasMany('Namespace\Modules\Email\Models\Message');

}

/**

* User relationship

*

* @return \Illuminate\Database\Eloquent\Relations\BelongsTo

*/

public function user()

{

return $this->belongsTo(Config::get('email.user_model'));

}

}