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我有一个名为 User 的模型，它有许多通过分类模型关联的“分类法”。其中一种分类法是称为 Topic 的模型（继承自分类法）。我的模型用户也称为“可分类”。

编辑：添加了更多模型来澄清问题

class User < ActiveRecord::Base
  has_many :classifications, :as => :classifiable, :foreign_key => :classifiable_id
  has_many :topics, :through => :classifications, :source => :taxonomy, :source_type => "Topic"
end

class Taxonomy < ActiveRecord::Base
end

class Topic < Taxonomy
  has_many :classifications, :as => :taxonomy, :foreign_key => :taxonomy_id, :source_type => "Topic"
  has_many :professionals, :through => :classifications, :source => :classifiable, :source_type => "User", :conditions => {:is_a_professional => true}
  has_many :questions,     :through => :classifications, :source => :classifiable, :source_type => "Question"
  has_many :guides,        :through => :classifications, :source => :classifiable, :source_type => "Guide"
end

class Classification < ActiveRecord::Base
  attr_accessible :classifiable, :classifiable_id, :classifiable_type,
                  :taxonomy, :taxonomy_id, :taxonomy_type

  belongs_to :classifiable, :polymorphic => true
  belongs_to :taxonomy,     :polymorphic => true
end

除非我想删除关联，否则一切正常。

user = User.find(12) # any user
topic = user.topics.last # any of his topics
user.topics.delete(topic)

SQL ActiveRecord 运行如下：

DELETE FROM "classifications" WHERE "classifications"."classifiable_id" = 12 AND "classifications"."classifiable_type" = 'User' AND "classifications"."taxonomy_id" = 34 AND "classifications"."taxonomy_type" = 'Taxonomy'

显然，taxonomy_type 是错误的，它应该是“Topic”而不是“Taxonomy”。

由于我使用的是多态关联和 STI，因此我必须这样配置 ActiveRecord：

ActiveRecord::Base.store_base_sti_class = false

但是，它似乎不会在 collection.delete 上触发。这是rails的错误吗？

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