hasOne(User::class, 'id', 'user_id'); } public function toUser() { return $this->hasOne(User::class, 'id', 'to_user_id'); } public function supplyDemand() { return $this->hasOne(SupplyDemand::class, 'id', 'supply_demand_id'); } public function dialogue() { return $this->hasOne(Dialogue::class, 'id', 'dialogue_id'); } }