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Includes url_for into the host class. The class has to provide a RouteSet by implementing the _routes method. Otherwise, an exception will be raised.

In addition to AbstractController::UrlFor, this module accesses the HTTP layer to define URL options like the host. In order to do so, this module requires the host class to implement env which needs to be Rack-compatible and request which is either an instance of ActionDispatch::Request or an object that responds to the host, optional_port, protocol and symbolized_path_parameter methods.

class RootUrl
  include ActionController::UrlFor
  include Rails.application.routes.url_helpers

  delegate :env, :request, to: :controller

  def initialize(controller)
    @controller = controller
    @url        = root_path # named route from the application.
  end
end
Methods
U
Included Modules

Instance Public methods

url_options()

Source: show | on GitHub 

# File actionpack/lib/action_controller/metal/url_for.rb, line 30
def url_options
  @_url_options ||= {
    host: request.host,
    port: request.optional_port,
    protocol: request.protocol,
    _recall: request.path_parameters
  }.merge!(super).freeze

  if (same_origin = _routes.equal?(request.routes)) ||
     (script_name = request.engine_script_name(_routes)) ||
     (original_script_name = request.original_script_name)

    options = @_url_options.dup
    if original_script_name
      options[:original_script_name] = original_script_name
    else
      if same_origin
        options[:script_name] = request.script_name.empty? ? "" : request.script_name.dup
      else
        options[:script_name] = script_name
      end
    end
    options.freeze
  else
    @_url_options
  end
end