How to scope all of a model's finders based on a user preference

application_controller.rb

class ApplicationController < ActionController::Base
  around_filter :check_for_prefers_recent

  protected

  def check_for_prefers_recent
    if current_user && current_user.show_recent_only?
      Gift.scope_to_recent do
        yield
      end
    else
      yield
    end
  end
end

article.rb

class Gift < ActiveRecord::Base
  def self.scope_to_recent
    with_scope(:find => {:conditions => ['gifts.updated_at > ?', 6.months.ago]}) do
      yield
    end
  end
end