Extract routing context to its own file.

lib/devise/mapping.rb

@@ -1,12 +1,4 @@
 module Devise
-  class RoutingDetails
-    attr_reader :scope, :router_name
-
-    def initialize(mapping)
-      @scope = mapping.name
-      @router_name = mapping.router_name
-    end
-  end
   # Responsible for handling devise mappings and routes configuration. Each
   # resource configured by devise_for in routes is actually creating a mapping
   # object. You can refer to devise_for in routes for usage options.

lib/devise/routing_details.rb

@@ -0,0 +1,12 @@
+module Devise
+  # This is a data transfer object to avoid coupling between
+  # Devive::Mapping and the rest of the application.
+  class RoutingDetails
+    attr_reader :scope, :router_name
+
+    def initialize(mapping)
+      @scope = mapping.name
+      @router_name = mapping.router_name
+    end
+  end
+end