How can i find the path helper from specific route i have

I have a specific path helper that works perfectly in rails 2.3 but throws error on rails 3.1.

Here is the path helper.

shipping_price_store_return_path(store)

When i use this in rails 3.1 it gives me error saying

NoMethodError: undefined method `shipping_price_store_return_path' for #<ActionDispatch::Integration::Session:0x007fb2da730228>

can anyone suggest what could be going wrong here.

below are the content of routes file

resources :stores do      
      resources :return do
        match :shipping_price, :on => :collection
      end
end