Way to have validation code in the model?

[eluser]sikkle[/eluser]
Adamp1 : no no, in fact this is how it's suppose to be handled in real MVC. Most advanced framework will do validation into model, because it's not logic to write validation stuff two time, by example, edit, create.

I mean the validation class just work great, but it's hard to find an elegant way to DRY the code with it.