Domain object validation vs view model validation

Posted by Brendan Vogt on Stack Overflow See other posts from Stack Overflow or by Brendan Vogt
Published on 2010-12-21T12:42:52Z Indexed on 2010/12/21 12:54 UTC
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asp.net-mvc

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validation

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fluentvalidation

I am using ASP.NET MVC 3 and I am using FluentValidation to validate my view models. I am just a little concerned that I might not be on the correct track. As far as what I know, model validation should be done on the domain object. Now with MVC you might have multiple view models that are similar that needs validation. What happens if a property from a domain object occurs in more than one view model? Now you are validating the same property twice, and they might not even be in sync. So if I have a User domain object then I would like to do validation on this object. Now what happens if I have UserAViewModel and UserBViewModel, so now it is multiple validations that needs to be done.

The scenario above is just an example, so please don't critise on it.

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