method

helper_method

v1.0.0 - Show latest stable - 1 note - Class: ActionController::Helpers::ClassMethods

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What's this?

helper_method(*methods) public

Declare a controller method as a helper. For example,

  helper_method :link_to
  def link_to(name, options) ... end

makes the link_to controller method available in the view.

Show source

# File actionpack/lib/action_controller/helpers.rb, line 91
      def helper_method(*methods)
        methods.flatten.each do |method|
          master_helper_module.module_eval "def \#{method}(*args, &block)\ncontroller.send(%(\#{method}), *args, &block)\nend\n"
        end
      end

September 18, 2014 - (<= v4.0.2)

0 thanks

Only in ApplicationController

Seems like we can use helper_method only in ApplicationController. Even if we will create child controller, methods that will be created in child and listed in child’s helper_method will not be accessible from the view.

For example, we have

class SystemController < ApplicationController
 def important_method
   "I am important!"
 end
end

and

class BookController < SystemController
 def index
 end
end

And calling important_method from Book’s index view will raise an NoMethodError.

helper_method

Related methods

Only in ApplicationController