Android-cleanarchitecture: Why transform User in the User to UserModel in the presentation

[Deep21]

Hello everyone,
Why we are transform the User class to UserModel, we could pass just the User instance afterall to the view.
Why add this complexity ?

Thank you

[alexandru-calinoiu]

The way I think about it is that User is a dto (data transfer object), should be a simple pojo, it will responsible for passing info back and forward between my app and an external service like a database or an api.

UserModel on the other hand will contain some presentation logic, manipulate the raw User data to be presentable and consumed by the View layer, lately I use bindings between this models and the views.

[MohamedISoliman]

it's for separating the modules for a testability perspective making the system decoupled, and as @android10 mentioned in his blog post

It is worth mentioning that each layer uses its own data model so this independence can be reached (you will see in code that a data mapper is needed in order to accomplish data transformation, a price to be paid if you do not want to cross the use of your models over the entire application).

[Deep21]

thank you

[zvvadim]

Thank you, great job.

2017-03-30 21:37 GMT+03:00 Deep21 [e-mail]:

thank you

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[lbensaad]

This question is also discussed here #72 and there are interesting comments.

[jemshit]

This can be closed