# File lib/js_routes.rb, line 187
  def get_app_from_route(route)
    # rails engine in Rails 4.2 use additional ActionDispatch::Routing::Mapper::Constraints, which contain app
    if route.app.respond_to?(:app) && route.app.respond_to?(:constraints)
      route.app.app
    else
      route.app
    end
  end