[PATCH] "undefined method `NoMethodError' "

Create an ActiveRecord model, say Blog, and define a private setter on one of its attributes. Call the setter. AttributeMethods will raise an NoMethodError.

Ironically, it's because AttributeMethods is trying to raise a NoMethodError without calling .new on the class:

def method_missing(method_id, *args, &block)
  method_name = method_id.to_s

  if self.class.private_method_defined?(method_name)
    raise NoMethodError("Attempt to call private method", method_name, args)
  end

  ...

The fix is to add .new between NoMethodError and ("Attempt....