Extract Routing.controller_constraints

actionpack/lib/action_dispatch/routing.rb

@@ -276,6 +276,10 @@ module ActionDispatch
     end
 
     class << self
+      def controller_constraints
+        Regexp.union(*possible_controllers.collect { |n| Regexp.escape(n) })
+      end
+
       # Expects an array of controller names as the first argument.
       # Executes the passed block with only the named controllers named available.
       # This method is used in internal Rails testing.

actionpack/lib/action_dispatch/routing/deprecated_mapper.rb

@@ -113,8 +113,7 @@ module ActionDispatch
           end
         end
 
-        possible_names = Routing.possible_controllers.collect { |n| Regexp.escape(n) }
-        requirements[:controller] ||= Regexp.union(*possible_names)
+        requirements[:controller] ||= Routing.controller_constraints
 
         if defaults[:controller]
           defaults[:action] ||= 'index'

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -282,6 +282,8 @@ module ActionDispatch
         constraints.reject! { |k, v| segment_keys.include?(k.to_s) }
         conditions.merge!(constraints)
 
+        requirements[:controller] ||= Routing.controller_constraints
+
         if via = options[:via]
           via = Array(via).map { |m| m.to_s.upcase }
           conditions[:request_method] = Regexp.union(*via)