How to create a catch-all route in Ruby on Rails?

Question

I want to have all requests that satisfy a certain constraint to go to a specific controller. So I need a catch-all route. How do I specify that in Rails? Is it something li

Answer 1

This should work

Calamas::Application.routes.draw do
  get '*path', to: 'subdomain_controller#show',constraints: lambda { |request| request.path =~ /.+\.users/ }
end

Answer 2

I think you need minor tweaks in this approach but you get the point:

UPDATE:

#RAILS 3
#make this your last route.
match '*unmatched_route', :to => 'application#raise_not_found!'

#RAILS 4, needs a different syntax in the routes.rb. It does not accept Match anymore.
#make this your last route.
get '*unmatched_route', :to => 'application#raise_not_found!'

And

class ApplicationController < ActionController::Base

...
#called by last route matching unmatched routes.  
#Raises RoutingError which will be rescued from in the same way as other exceptions.
def raise_not_found!
    raise ActionController::RoutingError.new("No route matches #{params[:unmatched_route]}")
end
...

end

More info here: https://gist.github.com/Sujimichi/2349565