Providing I have the following scenario: I have a Web application where users can deposit money to their accounts (wire transfer). When a user deposits money to their account, they should click the Refresh my balance button to refresh their balance.The business logic behind the Refresh my balance is the following:Refresh balance, for example by calling a bank's webservice.If there is new money, subtract a % from it as a fee.The thing is that I would not like to allow refreshing balance without proceeding new deposit fees.I have two services:class AccountService{    //The following calls the bank webservice to get the new balance and updates the account entity    public function refreshBalance(Account account);}class FeeService{    //The following checks if there are deposits, and if there are it subtract a fee    public function proceedNewFees(Account account);}My MVC controller action is the following right now:public function refreshBalanceAction(){    $account = $this->accountService->getAuthenticatedAccount();    $this->accountService->refreshBalance($account);    $this->accountService->proceedNewFees($account);}As you can see, in the controller I have some business logic.I would like to move it to the Domain layer. Where is the best place to put this business logic from the controller? Create a new CommonLogicService? Implement it in the AccountModel (and if so, how to refer to the AccountService instance being in the AccountModel? DI?)?
Where to put common business logic in DDD with MVC
mvc;domain driven design;business;business logic
The way you describe it, I would put the code to update the balance in a separate UpdateBalanceService-class. Then create a new class 'RefreshBalanceService' that contains both the UpdateBalanceService and a ProcessNewFeesService. The UpdateBalanceService-class would then call both services and perform the necessary actions. It is then a matter of implementing your refresh-code so that it uses the UpdateBalanceService class to do its work, which will in turn delegate to the subservices to perform its tasks.