lib/rubocop/cop/style/class_methods.rb in rubocop-0.19.1 vs lib/rubocop/cop/style/class_methods.rb in rubocop-0.20.0

@@ -4,16 +4,32 @@
   module Cop
     module Style
       # This cop checks for uses of the class/module name instead of
       # self, when defining class/module methods.
       class ClassMethods < Cop
-        MSG = 'Prefer self over class/module for class/module methods.'
+        MSG = 'Use `self.%s` instead of `%s.%s`.'
 
         # TODO: Check if we're in a class/module
         def on_defs(node)
-          definee, _name, _args, _body = *node
+          definee, method_name, _args, _body = *node
 
-          add_offense(definee, :name) if definee.type == :const
+          if definee.type == :const
+            _, class_name = *definee
+            add_offense(definee, :name,
+                        message(class_name, method_name))
+          end
+        end
+
+        private
+
+        def message(class_name, method_name)
+          format(MSG, method_name, class_name, method_name)
+        end
+
+        def autocorrect(node)
+          @corrections << lambda do |corrector|
+            corrector.replace(node.loc.name, 'self')
+          end
         end
       end
     end
   end
 end