Can a model contains business validation operations or low level data handling stuff ?

[eluser]Rushino[/eluser]
Hello,

I know model is for data management from a bd (for insert, update, select, etc.) but can a model also contains low level methods ?

Example: I have an insert_entry(...) from an user model but that should only insert data to the DB. I would'nt encrypt the password in this method.. i may want a method that is called create_user instead that do this job and do some others stuff such send an email.

Does that go in the model or that should go in a library?

Thanks.