lib/active_support/callbacks.rb in activesupport-4.1.14 vs lib/active_support/callbacks.rb in activesupport-4.1.14.1

@@ -766,10 +766,10 @@
           line = class_eval "lambda { |result| #{value} }", __FILE__, __LINE__
           options[:terminator] = lambda { |target, result| target.instance_exec(result, &line) }
         end
 
         names.each do |name|
-          class_attribute "_#{name}_callbacks"
+          class_attribute "_#{name}_callbacks", instance_writer: false
           set_callbacks name, CallbackChain.new(name, options)
         end
       end
 
       protected