class ActiveModel::Serializer::Reflection

def serializer_options(subject, parent_serializer_options, reflection_options)
  serializer = reflection_options.fetch(:serializer, nil)
  serializer_options = parent_serializer_options.except(:serializer)
  serializer_options[:serializer] = serializer if serializer
  serializer_options[:serializer_context_class] = subject.class
  serializer_options
end