查找后的 Mongoid 文档持久性

Question

我无法在 mongoid 中保存我的文档。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

它会产生以下输出：

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

那么问题是为什么我第二次和第三次找到文档时邮政编码id会发生变化？

这是一个问题，因为文档不会持久存在。

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

Answer 1

您要保存文档吗？

尝试将自动保存设置为 true

见： http://mongoid.org/docs/upgrading.html （在页面上搜索自动保存）

Answer 2

根据http://mongoid.org/docs/relations/nested_attributes.html，您需要在has_many :locations 上设置autosave: true。

has_many :locations, as: :locatable, autosave: true
accepts_nested_attributes_for :locations