语法错误或访问冲突

语法错误或访问冲突

本文介绍了SQLSTATE [42000]:语法错误或访问冲突:1066关系不是唯一的表/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收到以下错误:

So, I am receiving the following error from Laravel:

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/参与者相关性看起来像这个:

My message/participants relatioship looks like this:

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

我正在尝试这样调用:

public function getAllMessages()
{
    return Message::with('user')->with('participants')->get();
}

为什么我收到此错误?到底是怎么回事?

Why am I getting this error? What is going on?

编辑:包含完整模型

Included full models

/ em>
class Message Enloquent
{
使用PublishedTrait;
使用SoftDeletingTrait;

Message 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 \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.*');
    }

}

参与者

Participant

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'));
    }
}


推荐答案

通过Larachat官方的Slack:

Answered via the Larachat official Slack:

关系缺少一个数据透视表,使其工作。 参与者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('Namespace\Modules\Email\Models\Participant', 'PIVOT', 'message_id', 'user_id')->withTimestamps();
}

因此,您不能使用参与者作为枢轴,因为它是关系中的表格,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.

这篇关于SQLSTATE [42000]:语法错误或访问冲突:1066关系不是唯一的表/别名的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-14 18:11