class ActiveModel::Serializer::Association::HasOne

def build_serializer(object, options = {})
  @serializer_class ||= Serializer.serializer_for(object) || DefaultSerializer
  options[:_wrap_in_array] = embed_in_root?
  super
end

def initialize(name, *args)
  super
  @root_key = @embedded_key.to_s.pluralize
  @key ||= "#{name}_id"
end