global

def serializer_class
  return @serializer_class if defined?(@serializer_class)
  serializer_for_options = { namespace: namespace }
  serializer_for_options[:serializer] = reflection_options[:serializer] if reflection_options.key?(:serializer)
  @serializer_class = association_options.fetch(:parent_serializer).class.serializer_for(object, serializer_for_options)
end