本文介绍了SQLSTATE[42000]:语法错误或访问冲突:1066 不是唯一的表/关系别名的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
所以，我从 Laravel 框架收到以下错误；但我找不到这个框架产生这个错误的原因:
So, I'm receiving the following error from Laravel framework; but I couldn't find why this framework is producing this error:
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:
My message/participants relationship looks like this:
public function participants()
{
return $this->belongsToMany('NamespaceModulesEmailModelsParticipant', 'participants', 'message_id', 'user_id')->withTimestamps();
}
我试着这样称呼它:
public function getAllMessages()
{
return Message::with('user')->with('participants')->get();
}
为什么我会收到这个错误?这是怎么回事?
Why am I getting this error? What's going on?
包括完整模型
留言
class Message extends Eloquent
{
use PublishedTrait;
use 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 IlluminateDatabaseEloquentRelationsBelongsTo
*/
public function user()
{
return $this->belongsTo(Config::get('email.user_model'));
}
public function assets()
{
return $this->belongsToMany('NamespaceModulesAssetsModelsAsset', 'message_assets');
}
/**
* Participants relationship
*
* @return IlluminateDatabaseEloquentRelationsHasMany
*/
public function participants()
{
return $this->belongsToMany('NamespaceModulesEmailModelsParticipant', 'participants', 'message_id', 'user_id')->withTimestamps();
}
/**
* Recipients of this message
*
* @return IlluminateDatabaseEloquentRelationsHasMany
*/
public function recipients()
{
return $this->participants()->where('user_id', '!=', $this->user_id);
}
/**
* Returns the latest message from a thread
*
* @return NamespaceModulesEmailModelsMessage
*/
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.*');
}
}
参与者
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 IlluminateDatabaseEloquentRelationsBelongsTo
*/
public function message()
{
return $this->hasMany('NamespaceModulesEmailModelsMessage');
}
/**
* User relationship
*
* @return IlluminateDatabaseEloquentRelationsBelongsTo
*/
public function user()
{
return $this->belongsTo(Config::get('email.user_model'));
}
}
推荐答案
通过 Laracat 官方 Slack 回答:
Answered via the Larachat official Slack:
该关系缺少一个数据透视表以使其正常工作.participants 方法中的第二个参数是要使用的数据透视表:
The relationship is missing a pivot table for this to work. The second argument in the participants method is the pivot table to use:
public function participants()
{
return $this->belongsToMany('NamespaceModulesEmailModelsParticipant', 'PIVOT', 'message_id', 'user_id')->withTimestamps();
}
因此，您不能使用参与者作为数据透视表，因为它是关系中的表之一，您需要一个message_participant 数据透视表.
Therefore, you can't use participants as the pivot because it is one of the tables in the relationship, you need a message_participant pivot table.
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