belongs_to关联没有返回正确的对象

Question

我有一个Order模型，其中有两个belongs_to关联，每个关联到Account模型的不同子类。从数据库加载订单后，即使外键是正确的，两个关联也指向相同的模型。

class Account < AR::Base
end
class FooAccount < Account
end
class BarAccount < Account
end
class Order < AR::Base
  belongs_to :account, :class_name => 'FooAccount', 
    :foreign_key => :account_id
  belongs_to :different_account, :class_name => 'BarAccount', 
    :foreign_key => :different_account_id
end

控制台做这样的事情:

o = Order.find(42)
=> #<Order id: 42, account_id: 11, different_account_id: 99>
a = Account.find(11)
=> #<FooAccount id: 11, type: "FooAccount">
d = Account.id(99)
=> #<BarAccount id: 99, type: "BarAccount">
o.account_id
=> 11
o.account
=> #<BarAccount id: 99, type: "BarAccount">
o.different_account_id
=> 99
o.different_account
=> #<BarAccount id: 99, type: "BarAccount">

外键值正确，但关联引用的对象不正确!我做错了什么?

Answer 1

确保不与其他方法发生冲突!我在Order模型中遗漏了一个定义:

class Order < AR::Base
  belongs_to :account
  # a lot and a lot of code
  def account
    # does a different lookup than the association above
  end
end

删除帐户方法给了我正确的行为。