Rails3、Mongoid、黄瓜。无法设置 user_id 字段：ObjectId 格式非法

Question

我有一个帐户模型：

class Account
  include Mongoid::Document
  include Mongoid::Timestamps

  referenced_in   :user
end

和用户：

class User
  include Mongoid::Document
  include Mongoid::Timestamps

  ...

  references_one :account

  ...
end

以及以下场景（我尝试设置reference_one关联）：

  Scenario: Client views his account
    Given the following accounts:
      | user_id          |
      |  1123322131      |
         .....

以及以下步骤：

Given /^the following accounts:$/ do |class_name, table|
  table.hashes.each do |attributes|
    Account.create(attributes)
  end
end

当我尝试运行黄瓜时，我总是收到错误：

illegal ObjectId format (BSON::InvalidObjectId)
./features/step_definitions/common_steps.rb:7:in `block (2 levels) in <top (required)>'
./features/step_definitions/common_steps.rb:6:in `each'
./features/step_definitions/common_steps.rb:6:in `/^the following accounts:$/'
features/manage_accounts.feature:8:in `And the following accounts:'

完整版本的回溯：https://gist.github.com/433ea982d876e1b1fa27

我使用：Rails 3.0.3、Ruby 1.9.2、cucumber 1.9.4 ，机械师2，mongoid。我的 Gemfile

我做错了什么？

UPD。没有那么明显的行为：

> a = Account.create :user_id => "123" 
BSON::InvalidObjectId: illegal ObjectId format
> a = Account.create :user_id => 123
=> #<Account _id: 4ceedf055e6f991aef000005, created_at: 2010-11-25 22:11:17 UTC, updated_at: 2010-11-25 22:11:17 UTC, user_id: 123>
> a = Account.create :user_id => "4ceede9b5e6f991aef000007"
=> #<Account _id: 4ceedf1b5e6f991aef000006, created_at: 2010-11-25 22:11:39 UTC, updated_at: 2010-11-25 22:11:39 UTC, user_id: BSON::ObjectId('4ceede9b5e6f991aef000007')>

Answer 1

这可以解决您的问题：

Given /^the following accounts:$/ do |class_name, table|
  table.hashes.each do |attributes|
    User.create(attributes).create_account
  end
end

您是否为 User 使用自定义主键？看来 Mongoid 期待一个正常的 BSON::ObjectId 像 BSON::ObjectId('4ceeaf282b2d3a2ab0000001' 但你传递的是像 1123322131 这样的纯字符串。一般来说，在尝试创建记录及其关联时必须小心同时