hasOne(Collaborator::class, 'id', 'sign_id'); } public function introduceInfo() { return $this->hasOne(Collaborator::class, 'id', 'introduce_id'); } public function orderInfo(){ return $this->hasOne(Order::class, 'id', 'order_id'); } public function quotaInfo(){ return $this->hasOne(Quota::class, 'id', 'quota_id'); } }