MVC: Where to put business logic? [closed]

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I prefer to put domain logic in the model for a couple of reasons.

  1. The model should have no UI code in it and thus be easier to test. Whenever possible, I like to have a fully working (meaning complete test coverage) model before writing any UI code. The controller can trust that the model is doing the right thing and just deal with UI concerns.

  2. If you put domain logic in a controller, it’s not as easy to share between different apps, or even between different controllers.

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