# Where does the implementation of a command / domainLogic go?

• Commands must be implementated inside the respective CommandSetCode class inside the domain module's src folder.

  For example: create command defined inside Lottery command set will need to be implemented inside LotteryCommandSetCode.scala

  class LotteryCommandSetCode(domainLogicRef:DomainLogicRef) extends LotteryCommandSetCommands {
        override def create = CreateCommand {
            import CreateCommand._
            input: Input =>
            //todo: command logic goes here
        }
  }
  

• Domain Logic function must be implementated inside the generated DomainLogicCode class inside the domain module's src folder.

  For example: lotteryNameExists function defined inside Lottery domain logic will need to be implemented inside LotteryDomainLogicCode.scala

  class LotteryDomainLogicCode extends LotteryDomainLogic {
    override def lotteryNameExists(lotteryName: String): Boolean = {
      LotteryQuery().lotteryName.equalsIgnoreCase(lotteryName).exists
    }
  	...
  }