思考狮身人面像 - 未定义的方法`klass'

Question

我有一个 Artwork 模型，它与 HABTM 的模型 Subject、Location、Keyword、Style 和 Medium 相关联。我还与一对多的Artist 模型建立了关联。这是我不断收到的错误：

>rake ts:index
Generating configuration to /Users/<user>/Developer/jtodd/jtoddgalleries/config/development.sphinx.conf
rake aborted!
NoMethodError: undefined method `klass' for nil:NilClass

这是我的索引文件：

ThinkingSphinx::Index.define :artwork, :with => :active_record do
    indexes title, :sortable => true
    has jtg
    has width
    has height


    has subject.id, :as => :subject_ids
    has location.id, :as => :location_ids
    has keyword.id, :as => :keyword_ids
    has artist.first_name, :as => :artist_first
    has artist.last_name, :as => :artist_last

    has style.id, :as => :style_ids
    has medium.id, :as => :medium_ids
end

我不明白为什么我不断收到不同的错误。我可能对字段与属性没有牢牢把握，也许这就是我出错的地方。非常感谢任何帮助，谢谢！

Answer 1

我假设您的关联都以复数名称列在您的 Artwork 模型中？它需要在您的索引定义中相同。

对于字段与属性，一个好的经验法则是，您希望用户输入并获得结果的任何内容都应该是字段。所以，我猜你会想要艺术家的名字和姓氏作为字段。

因此，修改后的索引定义：

ThinkingSphinx::Index.define :artwork, :with => :active_record do
  indexes title, :sortable => true
  indexes artist.first_name, :as => :artist_first
  indexes artist.last_name,  :as => :artist_last
  has jtg
  has width
  has height

  has subjects.id, :as => :subject_ids
  has locations.id, :as => :location_ids
  has keywords.id, :as => :keyword_ids
  has styles.id, :as => :style_ids
  has mediums.id, :as => :medium_ids
  # or is it media?
end

如果您仍然收到错误，您可以运行rake ts:index --trace 并与我们分享回溯吗？ :)