Suppose i have a use case "Customer Deposits Money on Account". Where should the functionality "Deposit()" go ? Customer or Account?. What should be the design for this use case ?
Class and their responsibility analysis
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When a
depositaction is performed then this action records atleast thedeposit_amountanddeposit_dateon which the action was done. So, placement of this actiondepositdepends upon the following four scenarios (or relation betweencustomerandaccount):[1] An
accountcan belong to manycustomer. However, acustomercan have a singleaccount. That is, the relation is one-to-many fromaccounttocustomer. In such a case,deposit(deposit_amountanddeposit_date) action should be part ofcustomer.[2] A
customercan hold manyaccount. However, anaccountcan belong to singlecustomer. That is, the relation is one-to-many fromcustomertoaccount. In such a case,deposit(deposit_amountanddeposit_date) action should be part ofaccount.[3] Many
accountcan belong to a singlecustomer. Also, anaccountcan be hold by manycustomer. That is, the relation is many-to-many fromaccounttocustomer. In such a case, it will be better to have a separate classCDeposit{customer_id, account_id, deposit_amount, deposit_date}which will record this actiondeposit`.[4] An
accountcan belong to only onecustomer. Also acustomercan hold only oneaccount. That is, the relation is one-to-one fromaccounttocustomer. In such a case,deposit(deposit_amountanddeposit_date) action can be part of any ofaccountorcustomer.