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I am building an app that can track weight. I allow the user to select their unit preference of kg or lbs. I want to keep the data in the DB standard (kg) so if the user selects lbs as their preference I need the data converted from kg to lbs in the UI.
This conversion can be handled very easily in the ViewModel.
This is one of the huge advantages of having a ViewModel – you can have easily testable logic, such as conversion between units, which stays completely separate from the user interface code.