what:
when you provide an optional create_dto or update_dto to the model factory types, the abstract service will generate a simple service method for the public services of the modules.
```
MoneyAmount: {
dto: PricingTypes.MoneyAmountDTO
create_dto: PricingTypes.CreateMoneyAmountDTO
}
```
In the above example, only a create method will be generated, but the update will be skipped.