[Rails] Extending a module in a controller

I'm trying to extend Enumerable in my Rails app. I've started with just
the controller where I wanted to use this method i.e.

class LookupController < ApplicationController

module Enumerable
def my_compress
....

... but when I visit the web page in question I get "No method
'my_compress' for Array ..."

I'm probably doing something fundamentally wrong - what could/should I
be doing?

thanks
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