I want to link to things that have routes that are constrained by a host by using their path helper.

my_app_one.html.erb

<%= link_to "Second App", my_app_two_path %>

routes.rb

MyApp::Application.routes.draw do
  get '/',                to: "static_pages#my_app_one", constraints: { host: ENV["MY_APP_ONE_DOMAIN"] }, as: :my_app_one
  get '/',                to: "static_pages#my_app_two", constraints: { host: ENV["MY_APP_TWO_DOMAIN"] }, as: :my_app_two
  root                    to: "static_pages#my_app_root"
end