How do I call a method in application helper from a view?

Question

I defined a custom method in application_helper.rb file like the following:

def rxtrnk(line)     rxTRNK = /\w{9,12}/m     trnks = Array.new     i = 0     while i <= line.size         if line[i].match(rxTRNK)             trnks[i] = line[i].scan(rxTRNK)         end         i += 1     end      return trnks   end 

Then I tried to call it from a view like so:

<% @yo = rxtrnk(@rts)%> 

But I get an error page like this:

NoMethodError in TrunksController#routesperswitch  undefined method `rxtrnk' for #<TrunksController:0x7f2dcf88> 

I know this is a very newbie question, but I couldn't find solution from googling :( Thanks for your help

edit/ here is the full application_helper.rb

module ApplicationHelper      def rxtrnk(line)     rxTRNK = /\w{9,12}/m     trnks = Array.new     i = 0     while i <= line.size         if line[i].match(rxTRNK)             trnks[i] = line[i].scan(rxTRNK)         end         i += 1     end      return trnks   end  end 

Answer 1

not sure what is the issue, but you can solve this by include the application_helper in the controller

class TrunksController      include ApplicationHelper end 

In the view call:

<%= @controller.rxtrnk %> 

Answer 2

You should make sure that the helper containing the method you want to call is included by the current controller (in your case you want to include the ApplicationHelper). This is controlled using the "helper" method in top of controllers.

Many Rails developers just include all helpers by default to avoid having to think about this. To do this add "helper :all" to the top of your ApplicationController:

class ApplicationController < ActionController::Base   helper :all end

You can also choose to only include the ApplicationHelper:

class ApplicationController < ActionController::Base   helper ApplicationHelper end