ruby-on-rails - Rails 4 嵌套属性更新

Question

仅更新嵌套时出现错误。

我在做什么:

user = User.find(1)
user.update(data_attributes: {race: 2})

我的模型:

class User < ActiveRecord::Base
  has_one :data, inverse_of: :user, class_name: UserData, autosave: true
  accepts_nested_attributes_for :data
end

class UserData < ActiveRecord::Base
  self.table_name = 'user_data'
  belongs_to :user, inverse_of: :data
end

错误:

Mysql2::Error: Column 'user_id' cannot be null: UPDATE `user_data` SET `user_id` = NULL, `updated_at` = '2015-01-05 10:27:47.680681' WHERE `user_data`.`id` = 1

Answer 1

如果您想更新现有的data 记录，您必须在attributes_param 中包含对象ID:

user = User.find(1)
user_data_id = user.data.id
user.update(data_attributes: { id: user_data_id, race: '2' })