Retrieving post data VS passing post data, in models

[eluser]rossmurphy[/eluser]
What's the best way to get post data into a model.

I have been using $this->input->post() in my models. It this best practice? Or is it more acceptable to pass data into the method from the controller?

The only problem i see with the latter is when i have too much data to pass, makes passing data to the function kind of messy.

Any thoughts?

Thanks