ruby-on-rails - 查找后的Mongoid文件持久化

我在Mongoid中保存文档时遇到问题。我的控制器中有以下代码片段：

params[:user][:residence_attributes][:locations_attributes].each do |num,location_attributes|
  zipcode = Location.find(location_attributes[:id])

  if !zipcode.update_attributes(location_attributes)
    puts "fail"
    fail = true
  end

  puts "zipcode again #{zipcode}"
  puts "zipcode number #{zipcode.number}"
  puts "zipcodes = #{Zipcode.count}"
  zipcode = Zipcode.find(@user.residence.locations[0].id)
  puts "zipcode again #{zipcode}"
  puts "zipcode number #{zipcode.number}"
  puts "zipcodes = #{Zipcode.count}"
  zipcode = Zipcode.find(@user.residence.locations[0].id)
  puts "zipcode again #{zipcode}"
  puts "zipcode number #{zipcode.number}"
  puts "zipcodes = #{Zipcode.count}"
end

它产生以下输出：

zipcode again #<Zipcode:0x000000063826a0>
zipcode number 11210
zipcodes = 1
zipcode again #<Zipcode:0x00000006348860>
zipcode number
zipcodes = 1
zipcode again #<Zipcode:0x00000006340ef8>
zipcode number
zipcodes = 1

所以问题是，当我第二次和第三次找到文档时，zipcode id为什么会改变？
这是一个问题，因为文档不存在。
我有以下型号：

class Zipcode < Location
  include Mongoid::Document
  attr_accessible :number
  attr_accessor :number

  validates_presence_of :number
  validate :check_zipcode
end

class Location
  include Mongoid::Document

  attr_accessible :latitude, :longitude
  belongs_to :locatable, polymorphic: true
end

class UserResidence
  include Mongoid::Document

  has_many :locations, as: :locatable

  embedded_in :user, :inverse_of => :residence

  attr_accessible :locations_attributes
  accepts_nested_attributes_for :locations, autosave: true

  #validates_presence_of :locations
  #validates :locations, :length => {:minimum => 1}
end

谢谢

最佳答案

你在保存文件吗？
尝试将autosave设置为true
见：
http://mongoid.org/docs/upgrading.html
（在页面上搜索自动保存）

关于ruby-on-rails - 查找后的Mongoid文件持久化，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/7624732/