Provides a `nav_link_to_controller` view helper method that works like `nav_link_to` https://gist.github.com/firedev/5308768 but also adds `selected` CSS class if the link equals current page or handled by the same controller.

nav_link_to_controller_helper.rb

# config/initializers/nav_link_to_controller_helper.rb
#
# nav_link_to https://gist.github.com/firedev/5308768
# nav_link_to_controller https://gist.github.com/firedev/8840403
#
#
# Provides a `nav_link_to_controller` view helper method that works like `nav_link_to` https://gist.github.com/firedev/5308768
# but also adds `selected` CSS class if the link equals current page or handled by the same controller.

module ActionView
  module Helpers
    module UrlHelper
      def nav_link_to_controller(name = nil, options = nil, html_options = nil, &block)
        html_options, options = options, name if block_given?
        options ||= {}
        if current_page?(options) || Rails.application.routes.recognize_path(options)[:controller] == params[:controller]
          html_options ||= { }
          html_options[:class] = '' unless html_options[:class]
          html_options[:class] << ' selected'
        end

        html_options = convert_options_to_data_attributes(options, html_options)

        url = url_for(options)
        html_options['href'] ||= url

        content_tag(:a, name || url, html_options, &block)
      end
    end
  end
end