rails custom helpers

I made a helper module and put it in the helper directory but when I
try and access any methods it says it does not recognize them. Ideas?
Rails 2.3.5

Helper:

module XmlTestDataHelper
  def update_xml_data

   end

end

Controller:

update_xml_data

undefined local variable or method `update_xml_data'

Are you requiring the file and including the module somewhere?

No, are not all of the helpers included all the time? I have
'helper :all' in the application controller.

helper: all just makes all the helpers available to your views, but
not to controller or model classes. This is because helpers are really
meant for views only. You can mix a helper in by including the helper,
but it really isn't a good practice. Better to create a separate
module or mixin and not have it be a helper.

Sheldon Finlay

okie dokie.