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在 Rails 4 中，我有一个 has_many 关系，如下所示：

class Company::Appointment < ActiveRecord::Base
  has_many :company_appointment_extras, class_name: "Company::Appointment::Extra"
  accepts_nested_attributes_for :company_appointment_extras
end

class Company::Appointment::Extra < ActiveRecord::Base
  belongs_to :company_appointment, class_name: "Company::Appointment"
end

用户使用嵌套表单同时创建这些对象。一切正常，直到写入数据库，此时我收到此错误：

can't write unknown attribute `appointment_id'

起初我以为错误是从 抛出的Company::Appointment::Extra，但是当我尝试添加foreign_key: "company_appointment_id"减速belongs_to时，我继续得到unknown attribute 'appointment_id'错误，这意味着错误不是来自那个关系。

实际上，查看控制台，似乎错误实际上是在编写Company::Appointment自身时发生的：

SQL (1.0ms)  INSERT INTO "company_appointments" ("company_id", "created_at", "date", "total", "updated_at", "user_property_id") VALUES ($1, $2, $3, $4, $5, $6) RETURNING "id"  [["company_id", 1], ["created_at", Thu, 05 Sep 2013 04:58:19 UTC +00:00], ["date", Fri, 06 Sep 2013 00:00:00 UTC +00:00], ["total", #<BigDecimal:6ac2118,'0.55E2',9(27)>], ["updated_at", Thu, 05 Sep 2013 04:58:19 UTC +00:00], ["user_property_id", 1]]
(0.3ms)  ROLLBACK
Completed 500 Internal Server Error in 452ms

知道为什么会这样吗？

编辑：

我应该澄清一下，在我的迁移中，我声明：t.integer :company_appointment_id, null: false. 关键其实company_appointment_id，不是appointment_id。

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