Mongoid 字段没有被持久化答案

【问题标题】：Mongoid fields not being persistedMongoid 字段没有被持久化
【发布时间】：2011-09-08 21:13:16
【问题描述】：

所以我有一个非常简单的 mongoid 类：

class Offer
  include Mongoid::Document

  field :date, type: DateTime
  field :accepted, type: Boolean

  scope :accepted, where(accepted: true)
  scope :denied, where(accepted: false)

  belongs_to :from, class_name: 'User', inverse_of: :from_offers
  belongs_to :to, class_name: 'User', inverse_of: :to_offers
  belongs_to :update 
end

但是，在创建之后，它的所有字段都不能更新。如果我执行诸如 offer.accepted = true 然后 offer.save! 之类的操作，则不会引发错误，但是一旦操作完成并且您刷新页面或 w/e 更改将被还原。我真的不知道如何进行。有什么帮助吗？

更新：我的更新类不应该有一个 offer_id 字段吗？

=> #<Update _id: 4e6933836066250375000033, _type: nil, updated_at: 2011-09-08 21:28:44 UTC, type: "offer", unread: false, topic_id: nil, post_id: nil, user_id: BSON::ObjectId('4e692ad3606625123b000001'), profile_id: nil, commenter_id: BSON::ObjectId('4e692b0b606625037500002a')>

UPDATE2：我认为这可能是 has_one 的错误。我已恢复为仅将更新的 id 存储在字符串字段而不是 has_one 连接中，一切似乎都很好。

【问题讨论】：

标签： ruby-on-rails mongoid

【解决方案1】：

这也被报告为GitHub issue。

我无法在 Mongoid 2.2.0 或 2.2.0-stable 分支上重现该问题（截至 d6ace09c）。

这段代码：

class Offer
  include Mongoid::Document

  field :date, type: DateTime
  field :accepted, type: Boolean

  scope :accepted, where(accepted: true)
  scope :denied, where(accepted: false)

  belongs_to :from, class_name: 'User', inverse_of: :from_offers
  belongs_to :to,   class_name: 'User', inverse_of: :to_offers
end

class User
  include Mongoid::Document

  has_many :from_offers,  :class_name => 'Offer', :inverse_of => :from
  has_many :to_offers,    :class_name => 'Offer', :inverse_of => :to
end

User.delete_all
Offer.delete_all

user1 = User.create
user2 = User.create
user3 = User.create
puts "user1 ID = #{user1.id}"
puts "user2 ID = #{user2.id}"
puts "user3 ID = #{user3.id}"

Offer.create(
  :date     => Date.today,
  :accepted => false,
  :from     => user1,
  :to       => user2,
)

ap Offer.first.attributes
Offer.first.update_attributes :accepted => true, :to => user3
ap Offer.first.attributes

产生了这个输出，表明offer已成功更新：

user1 ID = 4e696a052b58af5dce000001
user2 ID = 4e696a052b58af5dce000002
user3 ID = 4e696a052b58af5dce000003
{
         "_id" => BSON::ObjectId('4e696a052b58af5dce000004'),
        "date" => 2011-09-08 04:00:00 UTC,
    "accepted" => false,
     "from_id" => BSON::ObjectId('4e696a052b58af5dce000001'),
       "to_id" => BSON::ObjectId('4e696a052b58af5dce000002')
}
{
         "_id" => BSON::ObjectId('4e696a052b58af5dce000004'),
        "date" => 2011-09-08 04:00:00 UTC,
    "accepted" => true,
     "from_id" => BSON::ObjectId('4e696a052b58af5dce000001'),
       "to_id" => BSON::ObjectId('4e696a052b58af5dce000003')
}

【讨论】：