module ActiveRecord::Core::ClassMethods

def inherited(child_class) # :nodoc:
  # initialize cache at class definition for thread safety
  child_class.initialize_find_by_cache
  unless child_class.base_class?
    klass = self
    until klass.base_class?
      klass.initialize_find_by_cache
      klass = klass.superclass
    end
  end
  super
end