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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