title: User helper functions in Lib classes
body: <p>In rails 3, is it possible to use helper functions in library classes? for example, I have helper:</p>
  
  <pre><code>module CarHelper
    def total_price(cars)
      #Do something here
    end
  end
  </code></pre>
  
  <p>In my Lib/my_library.rb</p>
  
  <pre><code>class MyLibrary
   def myFunc
     # I would like to use helper function total_price(cars) here
   end
  </code></pre>
  
  <p>end</p>
  
  <p>How to use helper functions in Lib classes?</p>