ruby-on-rails - 认为狮身人面像，协会不起作用

我有一个模型：

class Topic < ActiveRecord::Base

  define_index do
    indexes title, :sortable => true
    indexes body
    indexes tags(:name), :as => :tag_name
  end

  has_and_belongs_to_many :tags, :join_table => 'topic_tags', :order => 'tags.name asc'

end

当我跑步时：

rake ts:rebuild

I get:

sql_range_query: Unknown column 'topics.name' in 'field list'

And my 'config/development.sphinx.conf' has this oddness:

  sql_query = SELECT `topics`.`id` * 1 + 0 AS `id` , CAST(`topics`.`title` AS CHAR) AS
`title`, CAST(`topics`.`body` AS CHAR) AS `body`, CAST(`topics`.`name` AS CHAR) AS
`tag_name`, `topics`.`id` AS `sphinx_internal_id`, 1552019743 AS `class_crc`, '1552019743'
 AS `subclass_crcs`, 0 AS `sphinx_deleted`, IFNULL(`topics`.`title`, '') AS `title_sort`
FROM `topics`    WHERE `topics`.`id` >= $start AND `topics`.`id` <= $end GROUP BY
`topics`.`id`  ORDER BY NULL
  sql_query_range = SELECT IFNULL(MIN(`id`), 1), IFNULL(MAX(`id`), 1) FROM `topics`

因此，出于某种原因，协会看起来破产了，我哪里做错了，我该如何解决？
（运行轨道2.3.4和最新思想斯芬克斯1.2.11）

最佳答案

小陷阱：
这是有效的：

class Topic < ActiveRecord::Base
  has_and_belongs_to_many :tags, :join_table => 'topic_tags', :order => 'tags.name asc'

  define_index do
    indexes title, :sortable => true
    indexes body
    indexes tags(:name), :as => :tag_name
  end



end

必须在索引之前定义关联。