访问数据透视表“第三模型关系"在 Laravel 雄辩

2022-01-22 00:00:00 pivot php laravel eloquent

我有这种多对多关系 Laravel Eloquent 关系模型是:

I have this Many-to-Many relation Laravel Eloquent relationship The Models are:

class Email extends Model //actually represent the email account
{
    protected $table = 'emails';

    protected $fillable = [
        'user_id',
        'name',
    ];

    public function messages() {
       return $this->belongsToMany(Message::class)->withPivot('email_subtype_id');
    }
}

class Message extends Model //actually represent the email message
{
    protected $table = 'messages';

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

    public function emails() {
        return $this->belongsToMany(Email::class)->withPivot('email_subtype_id');
    }
}

class EmailMessage extends Pivot //actually represent the pivot table
{
    protected $table = 'email_message';

    protected $fillable = [
        'email_id',
        'message_id',
        'email_subtype_id',
    ];

    public function email() {
        return $this->belongsTo(Email::class);
    }

    public function message() {
        return $this->belongsTo(Message::class);
    }

    //this is the relation to a third model called EmailSubtype
    //I want to include this relation to the Pivot when using it
    public function subtype() {
        return $this->belongsTo(EmailSubtype::class, 'email_subtype_id');
    }
}

class EmailSubtype extends Model //3rd Model need to be included with Pivot
{
    protected $table = 'email_subtypes';

    protected $fillable = [
        'name'
    ];

    public function pivotEmailSubtype(){
        return $this->hasMany(Pivot::class, 'email_subtype_id');
    }
}

我可以在控制器中做到这一点:

I am able to do this in the Controller:

    $email = Email::find(1);

    foreach($email->messages as $message) {
        $subtype_id = $message->pivot->email_subtype_id;
        dd($subtype_id); //1 that relates to subtype: CC Email Account
        //also I can get the name indirectly away from the relation as follows:
        $subtypeName = EmailSubtype::find($subtype_id)->first()->name;
        dd($subtypeName);
    }

在这里，我仅通过直接枢轴关系获取 email_subtype_id，但必须做额外的工作才能获取相关的电子邮件子类型名称.

Here I am getting the email_subtype_id only by direct pivot relation but have to do extra work to get the related email sub-type name.

我需要从第 3 个模型 EmailSubtype 关系 oneToMany [hasMany 和 belongsTo] 中获取电子邮件子类型名称 [Directly]，该关系与使用 EmailSubtype 模型的 Pivot 模型相关，使用类似:

I need to get the email sub-type name [Directly] from the 3rd Model EmailSubtype relationship oneToMany [hasMany and belongsTo] that relates to Pivot model with EmailSubtype model using something like:

$message->pivot->subtypeName;

请帮忙！

推荐答案

使用这个:

public function messages() {
   return $this->belongsToMany(Message::class)->withPivot('email_subtype_id') 
       ->using(EmailMessage::class);
}

$message->pivot->subtype->name

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