嵌套属性可以与继承结合使用吗？ [英] Can nested attributes be used in combination with inheritance?

问题描述

我有以下课程：

• 项目


• 人


• 人> 开发人员


• 人> 经理

• Project
• Person
• Person > Developer
• Person > Manager

在项目中 model我添加了以下语句：

In the Project model I have added the following statements:

has_and_belongs_to_many :people
accepts_nested_attributes_for :people

当然，类 Person 中的相应语句。如何通过 nested_attributes Developer 添加到项目 >方法？以下不起作用：

And of course the appropriate statements in the class Person. How can I add a Developer to a Project through the nested_attributes method? The following does not work:

@p.people_attributes = [{:name => "Epic Beard Man", :type => "Developer"}]
@p.people
=> [#<Person id: nil, name: "Epic Beard Man", type: nil>]

如您所见，类型属性设置为 nil 而不是Developer。

As you can see the type attributes is set to nil instead of "Developer".

推荐答案

前几天我遇到过类似的问题。 STI模型中的继承列（即类型）是受保护的属性。执行以下操作以覆盖 Person 类中的默认保护。

I encountered a similar problem few days ago. The inheritance column(i.e. type) in a STI model is a protected attribute. Do the following to override the default protection in your Person class.

Rails 2.3

class Person < ActiveRecord::Base

private
  def attributes_protected_by_default
    super - [self.class.inheritance_column]
  end
end

Rails 3

请参阅 @tokland 解决方案 >。

Refer to the solution suggested by @tokland.

警告：

您正在覆盖系统保护属性。

You are overriding the system protected attribute.

参考：

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