class ActiveModelSerializers::Adapter::JsonApi::Relationship

def data_for_many(association)
  # TODO(BF): Process relationship without evaluating lazy_association
  collection_serializer = association.lazy_association.serializer
  if collection_serializer.respond_to?(:each)
    collection_serializer.map do |serializer|
      ResourceIdentifier.new(serializer, serializable_resource_options).as_json
    end
  elsif (virtual_value = association.virtual_value)
    virtual_value
  else
    []
  end
end