find_filter_append_position

# File actionpack/lib/action_controller/filters.rb, line 530
        def find_filter_append_position(filters, filter_type)
          # appending an after filter puts it at the end of the call chain
          # before and around filters go before the first after filter in the chain
          unless filter_type == :after
            filter_chain.each_with_index do |f,i|
              return i if f.after?
            end
          end
          return -1
        end