I have an app where users have a role,a username,faculty and so on.When I'm looking for a list of users by their role or faculty or anything they have in common I can call (among others possible)

      @users = User.find_by_role(params[:role]) #or
      @users = User.find_by_shift(params[:shift]) 

So it keeps the system

      Class.find_by_property

So the question is: What if at different points users lists should be generated based on different properties.I mean: I'm passing from different links

1. params[:role] or
2. params[:faculty] or
3. params[:department]

to my list action in my users controller.As I see it all has to be in that action,but which parameter should the search be made by?