form rules/values: helper, controller or model?

[eluser]Vega[/eluser]
Check out: saving sets of rules to a config file

You can then run the validation rules above like:

Code:

if ($this->form_validation->run('post') !== TRUE)
{
  // load view for error
}
else
{
  // success: add to db/redirect etc
  $this->some_model->create();
}

Personally I don't like putting validation or anything else in the model or else it doesn't really abide by the MVC principal. It should be database work only.