Form validation not in controller but rather in Model

[eluser]Ajaxian64[/eluser]
Hi all,

just a very simple question (maybe stupid, but I try...)

Must we put the form_validation in a controller's method or could we put it in a model class ?
I mean, till now I do this kind of things:
I have a form, in the form the action on submit call a controller method in which we can check the post data.

But I'm in a case where this kind of design is weak, moreover dealing with data checking in a controller is not perhaps the good manner to do.

Then does it work if In my controller method I call $this->my_model->checkData(list of data posted)
HoweverI wonder also what appear for the error message displaying with the form_validation (I load it in the model)
Thanks for your help