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I have a MVC application that receives an input from a form.
This is a login form so the only validation that is necessary is to check whether the input is non-empty.
Right now before I pass it to the model I validate it in the controller.
Is this a best practice or not? Does it belong to the model?
I don’t think there’s an official best practice limiting validation to any single part of the MVC pattern. For example, your view can (and should) do some up-front validation using Javascript. Your controller should also offer the same types of validation, as well as more business-logic related validation. The model can also offer forms of validation, i.e., setters not allowing null values.
There’s an interesting discussion of this at joelonsoftware.