class ActiveModelSerializers::Adapter::JsonApi

def process_relationship(serializer, include_slice)
  if serializer.respond_to?(:each)
    serializer.each { |s| process_relationship(s, include_slice) }
    return
  end
  return unless serializer && serializer.object
  return unless process_resource(serializer, false, include_slice)
  process_relationships(serializer, include_slice)
end