Merge pull request #12917 from akshay-vishnoi/refactor

avoiding iterations and calling of underscore on all elements of array

railties/lib/rails/generators/named_base.rb

@@ -90,7 +90,7 @@ def namespaced_class_path
         end
 
         def namespaced_path
-          @namespaced_path ||= namespace.name.split("::").map {|m| m.underscore }[0]
+          @namespaced_path ||= namespace.name.split("::").first.underscore
         end
 
         def class_name