Select dropdown based off join table's include?

I have a "New Photo" view where I'd like to provide a select dropdown
of the user's favorite locations. Getting the data for a user's
favorites is no problem, but I'm not sure how to put the location name
into the select form.

def new
  @photo =
  @favorites = current_user.favorites.find(:all, :include
=> :location)

<%= f.collection_select :location_id,
@favorites, :location_id, :location_id, { :include_blank => true }, {}

(the 4th parameter in the f.collection_select above is my problem)

On a related note, is there a more efficient way to query for the
locations' id & name w/o returning all fields? Or is it not really
that much of a performance issue?

Any tips would be greatly appreciated. Thanks in advance.

Add location_name as a method on User:

  def location_name

Then you can pass :location_name to collection_select.