hasOne(Bill::class, 'id', 'bill_id'); } public function billFlagAcknowledgedByProAdmin() { return $this->hasOne(Pro::class, 'id', 'flagged_by_administrator_pro_id'); } public function billFlagAcknowledgedByPro() { return $this->hasOne(Pro::class, 'id', 'administrator_flag_acknowledged_by_pro_id'); } }