Ruby on Rails route for wildcard subdomains to a controller/action

Question

I dynamically create URLs of the form username.users.example.com:

bob.users.example.com
tim.users.example.com
scott.users.example.com

All of *.users.example.com requests should go to a particular controller/action. How do I specify this in routes.rb?

All other requests to www.example.com go to the normal list of routes in my routes.rb file.

UPDATE: I watch the railscast about subdomains and it showed the following bit of code which would seem to be exactly what I need (changed the controller and subdomain):

match '', to: 'my_controller#show', constraints: {subdomain: /.+\.users/}

The problem is it only matches the root URL. I need this to match EVERY possible URL with a *.users subdomain. So obviously I would put it at the top of my routes.rb file. But how do I specify a catch-all route? Is it simply '*'? Or '/*'?

Answer 1

I think, you just need to do the following :

create a class Subdomain in lib :

  class Subdomain  
    def self.matches?(request)  
      request.subdomain.present? && request.host.include?('.users')
    end  
  end

and in your routes :

constraints Subdomain do
  match '', to: 'my_controller#show'
end