Who is responsible for loading data?

Question

I have a constructor signature that looks like this.

public LocateEditorViewModel(
    ILocateRepository locateRepository, 
    int id, 
    IInteractionService interactionService)
{

As the class name suggests this is the view model I use to edit locates. This view model is created from a factory that injects ILocateRepository and IInteractionService. The id is passed in the factories Create(int id) function.

Is it the job of the LocateEditorViewModel to receive and id of the item I wish to edit and query it from the database. Or should I query for the given item in my factory and replace my int id parameter into a LocateViewModel object?

Answer 1

The ViewModel works on the data of the Model which in turn accesses the database. The ViewModel does not access the database.
So: Yes, you should replace the id with the actual object.