Question

Suppose i have class USER with attributes.

In some examples i see UserService class defined for some functions.

I am confused which things or functions should written in User Class and which things in UserService.

For e,g If i want to write some function To Validate users in database like

validate(user,pass)

Where should write those function

Also if i have class ShoppingProducts

and i want to get all prodcuts shopped by particular user in which class should i write that function i mean in product class or UserService or ProductService

Answer 1

This is a typical example of domain model vs anemic model.

There’s a lot of theory in this discussion, but a practical advice from me is to:

• put all methods that can operate on the User properties only in the User class.
• put all methods that require database access, accessing web services, or other layers, in the service.

See this related article of mine.