Methods
#
Included Modules
Classes and Modules
Instance Public methods
_routes()

Source: show | on GitHub 

    # File actionpack/lib/abstract_controller/url_for.rb, line 12
12:     def _routes
13:       raise "In order to use #url_for, you must include routing helpers explicitly. " \
14:             "For instance, `include Rails.application.routes.url_helpers"
15:     end