ruby on rails-具有单表继承(STI)和has_and_belongs_to_many(HABTM)关联的B

Question

使用Rails 3.0.7，并具有以下4种型号：

class User < ActiveRecord::Base
end
class Administrator < User
  has_and_belongs_to_many :clients
end
class Client < ActiveRecord::Base
  has_and_belongs_to_many :administrators
  has_and_belongs_to_many :meetings
end
class Meeting < ActiveRecord::Base
  has_and_belongs_to_many :clients
  def self.foo
    self.joins(:clients => :administrators)
  end
end

呼叫：

Meeting.foo.to_sql

生产：

SELECT meetings.*
FROM meetings
INNER JOIN clients_meetings ON clients_meetings.event_id = meetings.id
INNER JOIN clients ON clients.id = clients_meetings.child_id
INNER JOIN clients_administrators ON clients_administrators.child_id = clients.id
INNER JOIN users ON users.type = 'Administrator'

但似乎错过了"clients_administrators"one_answers"users"之间的最终联接关系。我认为SQL的最后一行应该是：

INNER JOIN users ON users.id = clients_administrators.user_id
WHERE users.type = 'Administrator'

这是个虫子吗？或者我误解了什么？

感谢

Answer 1

这似乎是一个错误，但它已在Rails3.1中得到解决。