How can I scope the options returned by option_groups_from_collection_for_select?
Method calls look like this: option_groups_from_collection_for_select (collection, group_method, group_label_method, option_key_method, option_value_method, selected_key = nil)
But say I want to limit the results returned by the option_key and option_value methods to some particular scope?
For instance, using the sample code in rdoc:
class Continent < ActiveRecord::Base has_many :countries # attribs: id, name end class Country < ActiveRecord::Base belongs_to :continent # attribs: id, name, continent_id end
I could get all countries grouped by continent with this: option_groups_from_collection_for_select (@continents, :countries, :name, :id, :name, 3)
But say I had another class called Ally:
class Alliance < ActiveRecord::Base has_many :countries #reciprocal belongs_to added to country #attribs: id, name end
How could I scope the OGFCFS call so that it only listed countries belonging to a particular alliance?