ActionDispatch::Routing::RouteSet::NamedRouteCollection::UrlHelper Ruby on Rails 5.1.2 Class ActionDispatch::Routing::RouteSet::NamedRouteCollection::UrlHelper < Object actionpack/lib/action_dispatch/routing/route_set.rb Namespace CLASS ActionDispatch::Routing::RouteSet::NamedRouteCollection::UrlHelper::OptimizedUrlHelper