Flowdock
helper_method(*methods) public

Declare a controller method as a helper. For example, the following makes the current_user controller method available to the view: 

  class ApplicationController < ActionController::Base
    helper_method :current_user, :logged_in?

    def current_user
      @current_user ||= User.find_by_id(session[:user])
    end

     def logged_in?
       current_user != nil
     end
  end

In a view: 

 <% if logged_in? -%>Welcome, <%= current_user.name %><% end -%>
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