Hi max.
I tried to understand you 
Because my english not enough.
Anyway the helpers are in our helper directories as you know. We can use them in our views. But the important point, if you wanna write your own helper and you wanna use it all your views you must write your helper to application_helper.rp For example. i use this def ----------------- application_helper.rb----------------- def my_helper(number) number_to_currency(number) end
and in my view ------------ list.rhtml ---------
Price: <%= my_helper(book.price) %>
that is it.
my explorer show this:
Price: