[Rails] Refactoring views ? Should public class methods be used in views?

I am refactoring my views and have learned that to separate view
controller and models and that the view is feed from the controller
that defines the instance variables related to a the models that is to
be used in views-
I have also learned that the number of inctace variables should be
limited to 1-2 in each action.

My question is about how to handle public class methods.
In some actions I have many such methods for objects as Person, User
etc and I could either define instance variables (but there will then
be to many) or specific presenters for these variables or putting them
directly into the views to define i.e select_tags with different
option lists

What solution is to be preferred ?
select_tag(:person_id, options_for_select(@people_list.insert(0,
['Select a person',0]),@selected_person.to_s),...
select_tag(:person_id, options_for_select(Person.all_people.insert(0,
['Select a person',0]),Person.current.to_s),..
select_tag(:person_id,
options_for_select(PeoplePresenter.all_people.insert(0,['Select a
person',0]),PeoplePresenter.current_person.to_s),..
etc

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