common\models\Member::tableName PHP Method

    public static function tableName()
    {
        return '{{%member}}';
    }

 public function getAddedByMember()
 {
     if ($this->added_by) {
         return $this->hasOne(Member::className(), ['id' => 'added_by'])->from(Member::tableName() . ' us');
     } else {
         return null;
     }
 }