This might give you some direction, I have a method "check_options" defined in "app/helpers/app_helper.rb"
In my controller that renders the view "app/controllers/app_controller.rb" I have the following line
helper: all # include all the helpers all the time
and then finally in my view I just call the "check_options" like
<% if check_options ...
From the documentation link that you posted looks like you might need
helper(*args, &block)
Declare a helper:
"helper :foo" requires ‘foo_helper’ and includes FooHelper in the template class.
Give this link a try as well http://caboo.se/doc/classes/ActionController/Helpers/ClassMethods.html there are some examples that might help
A small excerpt from the page
"By default, the controller will include a helper whose name matches that of the controller, e.g., MyController will automatically include MyHelper."
Cheers