今天早上我醒来时遇到了一个奇怪的问题，mongoid 正在为模型中未定义的属性创建记录

为了克服这个问题，我决定实现 attr_accessible 也在 Mongoid 中提到 specification

"Providing a list of fields as accessible is simply the inverse of protecting them. Anything not defined as accessible will cause the error." -- Mongoid Specification

认为一切都会正常工作我创建了一个虚拟记录而且我也很惊讶我被插入以反对上面的声明

"Anything not defined as accessible will cause the error

这是我的模型结构

class PartPriceRecord 
  include Mongoid::Document
    field :supplier_id,type: Integer
    field :part_number,type: String
    field :part_description, type: String
    field :core_indicator,type: String
    field :us_part_price,type: Float
    field :us_core_price,type: Float
    field :us_fleet_price,type: Float
    field :us_distributor_price,type: Float
    field :ca_part_price,type: Float
    field :ca_distributor_price,type: Float
    field :ca_core_price,type: Float
    field :ca_fleet_price,type: Float 
    field :basic_file_id,type: Integer
    index :part_number, unique: true

  validates_presence_of :supplier_id
  validates_presence_of :part_number
  #validates_uniqueness_of :part_number
  validates :part_number ,:format => { :with => /^[a-z0-9A-Z\s*-]+[-a-z0-9\s-]*[a-z0-9\s*-]+$/i ,:message => "Only AlphaNumeric Allowed" }
  validates :supplier_id, :format => { :with => /^[a-z0-9]+[-a-z0-9]*[a-z0-9]+$/i , :message => "Only Alphanumeric Allowed" } 
  #validates :part_description,:presence => true

  validates :part_description,:format => { :with => /^[a-z0-9]+[-a-z0-9]*[a-z0-9]+$/i ,:message => "Only Alphanumberic Allowed"} ,:allow_nil => true
  validates :core_indicator ,:inclusion => { :in => %w(Y N),
    :message => "%{value} is not a valid Coreindicator must be Y | N" 
   } ,:allow_nil => true,:allow_blank => true


 validates :us_part_price,:us_core_price,:us_fleet_price,:us_distributor_price,:ca_part_price,:ca_core_price,:ca_fleet_price,:ca_distributor_price ,:format => { :with => /^([0-9]+(\.([0-9]{2}|[0-9]{1}))?)$/ ,:message => "should look like money" } ,:allow_nil => true,:allow_blank => true

  @@required_attributes =[:supplier_id,:part_number,:part_description,:core_indicator,:us_part_price,:us_core_price,:us_fleet_price,:us_distributor_price,:ca_part_price,:ca_core_price,:ca_fleet_price,:ca_distributor_price]
  @@not_required_attributes = ["_id","basic_file_id"]  
  cattr_reader :required_attributes,:not_required_attributes
  attr_accessible :supplier_id,:part_number,:part_description, :core_indicator,:us_part_price,:us_core_price,:us_fleet_price,:us_distributor_price,:ca_part_price,:ca_distributor_price,:ca_core_price,:ca_fleet_price,:basic_file_id
end

这是我从控制台创建的记录

ruby-1.9.2-head :003 > PartPriceRecord.count()
 => 260317 ## initial count before creating a new record
ruby-1.9.2-head :004 > p1 = PartPriceRecord.new(:customer_id => "One",:part_number => "ASA",:supplier_id => "Supp")
 => #<PartPriceRecord _id: 4fa77921d2d8d60e39000002, _type: nil, supplier_id: "Supp", part_number: "ASA", part_description: nil, core_indicator: nil, us_part_price: nil, us_core_price: nil, us_fleet_price: nil, us_distributor_price: nil, ca_part_price: nil, ca_distributor_price: nil, ca_core_price: nil, ca_fleet_price: nil, basic_file_id: nil> 
ruby-1.9.2-head :005 > p1.save
 => true  ## Record got created
ruby-1.9.2-head :006 > PartPriceRecord.count()
 => 260318  ## Count indicating record was created

知道为什么会这样吗？

谢谢

最佳答案

您的问题是有效的——从以下测试和对 Mogoid 代码的粗略阅读来看，文档似乎不一致、不完全正确并且有些过时。

受 attr_protected 或 NOT attr_accessible 的字段忽略批量分配；他们不会在质量分配上引发错误。

在 Protected 部分，“引发错误”是不正确的，文档甚至不匹配 User 和 Person。在 Accessible 部分，“will cause the error”是不正确的，但是注释“默默地忽略 protected ”给出了一个线索，即没有引发错误并且忽略了质量分配。

这是来自 mongoid/spec/mongoid/attributes_spec.rb 的片段，它支持这一点。

describe ".attr_accessible" do

  context "when the field is not _id" do

    let(:account) do
      Account.new(number: 999999)
    end

    it "prevents setting via mass assignment" do
      account.number.should be_nil
    end
  end
...
end

您必须将字段 customer_id 添加到您的 PartPriceRecord 模型。我对 User 和 PartPriceRecord 的测试如下。希望这会有所帮助。

require 'test_helper'

class PartPriceRecordTest < ActiveSupport::TestCase
  def setup
    User.delete_all
    PartPriceRecord.delete_all
  end

  test "User" do
    assert_equal(0, User.count())
    # Set attributes on a user properly.
    user = User.new(first_name: "Corbin")
    assert_equal("Corbin", user.first_name)
    user.attributes = { first_name: "Corbin" }
    assert_equal("Corbin", user.first_name)
    user.write_attributes(first_name: "Corbin")
    assert_equal("Corbin", user.first_name)

    # Attempt to set attributes a user, raising an error. # <-- This documentation is incorrect, no error is raised
    #user = User.new(first_name: "Corbin", password: "password")
    user.attributes = { first_name: "Corbin", password: "password" } # inaccessible field is forced to nil
    assert_equal("Corbin", user.first_name)
    assert_equal(nil, user.password)
    user.write_attributes(first_name: "Corbin", password: "password") # inaccessible field is forced to nil
    assert_equal("Corbin", user.first_name)
    assert_equal(nil, user.password)
  end

  test "PartPriceRecord" do
    assert_equal(0, PartPriceRecord.count())
    p1 = PartPriceRecord.new(:customer_id => "One",:part_number => "ASA",:supplier_id => "Supp")
    assert_equal(nil, p1.customer_id)
    p1.save
    assert_equal(1, PartPriceRecord.count())
    assert_equal(nil, PartPriceRecord.find(p1.id).customer_id)
  end
end

关于mongodb - Mongoid attr_accessible 不工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10478303/