Can one controller point to different models?

[eluser]Unknown[/eluser]
Hello everyone, i am currently developing a login and registration system,
The login system(its own controller, model and view) includes function such as:
validate, if_uname_exists, if_email_exists, etc
registration system(its own controller, model and view) includes functions:
register,send_activation,send_email, etc

However i have a need to make a user controller, which has the username as a data member, and i need to call on functions such as <i>is_admin(), update_profile()</i>. So my doubt is, should those functions be included a user model, or rather can i have them in another model, for example: login model or maybe a profile model?

Are there any best practices to follow on the same?
Thanks alot

[eluser]phpkode[/eluser]
I have seen a good article on this. Here the user extends Admin_Controller, User_Controller etc. (which does checks like - is logged in / getting current username etc). Then these Controllers are extended instead of CI_Controller

http://jondavidjohn.com/blog/2011/01/sca...r-ion_auth

Although he has used Ion Auth, you can use your own system with a little work (anyway the logic remains the same)

[eluser]jairoh_[/eluser]
you can have BaseModel or parent model that your models will extend to.