Rails - Nov 2011 - Is there any problem extend ApplicationHelper in application controller

Hi
  I have a function in ApplicationHelper say an example

def url_needed
  if current_user.is_staff?
    home_url
  else
    another_url
  end
end

And in ApplicationController what I did is

   def check_for_the_feature
       flash[:notice] = ''You have no permission to do this.''
       self.extend ApplicationHelper
       redirect_to url_needed
   end

Is there any problem extending helper like this.

Thanks

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