> You'll want to put the shared method in app/controllers/application.rb 

Unless find_cart is used only in the one controller, then you just need 
to turn it into a before_filter:

class MainController < ApplicationController
    before_filter :set_cart

    def index
    end

    def what_ever
    end

    private

    def set_cart
       @cart = find_cart
    end
end

Peace.
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