app/controllers/acceptance_criteria_controller.rb
class AcceptanceCriteriaController < AbstractSecurityController
before_filter :set_user_story
before_filter :set_ac
def update
@ac.update_attribute(:done, params["acceptance_criterium_#{@ac.id}"][:done])
end
private
def set_ac
@ac = @user_story.acceptance_criteria.find(params[:id])
end
end