MTI中的STI和嵌套属性质量赋值?

时间:2011-10-05 08:25:09

标签: ruby-on-rails mongoid nested-attributes single-table-inheritance mass-assignment

使用mongoid通过嵌套属性进行质量分配的问题。

示例:

require 'mongoid'
require 'mongo'

class Company
  include Mongoid::Document

  has_many :workers,as: :workable, autosave: true
  accepts_nested_attributes_for :workers
end

class Worker
  include Mongoid::Document
  field :hours, type: Integer, default: 0
  belongs_to :workable, polymorphic: true
end

class Manager < Worker
  include Mongoid::Document
  field :order
  #attr_accessible :order
  attr_accessor :order

  validates_presence_of :order
end

Mongoid.configure do |config|
  config.master = Mongo::Connection.new.db("mydb")
end
connection = Mongo::Connection.new
connection.drop_database("mydb")
database = connection.db("mydb")

params = {"company" => {"workers_attributes" => {"0" => {"_type" => "Manager","hours" => 50, "order" => "fishing"}}}}
company = Company.create!(params["company"])
company.workers.each do |worker|
  puts "worker = #{worker.attributes}"
end

这输出以下内容:

worker = {"_id"=>BSON::ObjectId('4e8c126b1d41c85333000002'), "hours"=>50, "_type"=>"Manager", "workable_id"=>BSON::ObjectId('4e8c126b1d41c85333000001'), "workable_type"=>"Company"}

如果注释掉了行

attr_accessible :order 
我在评论中注释了以下内容:

WARNING: Can't mass-assign protected attributes: _type, hours
worker = {"_id"=>BSON::ObjectId('4e8c12c41d41c85352000002'), "hours"=>0, "_type"=>"Manager", "workable_id"=>BSON::ObjectId('4e8c12c41d41c85352000001'), "workable_type"=>"Company"}

请注意小时值是如何从默认值更新的。

问题,为什么在attr_accessible中评论会弄乱我的文档的持久性。另外我是rails的新手,我不完全理解attr_accessible但我知道我需要它来填写我的视野中的字段。如何使用attr_accessible行注释?

来保持文档的持久性

由于

1 个答案:

答案 0 :(得分:2)

首先查看API文档,了解有关attr_accessible here的说明。这应该为您提供更透彻的理解。

其次,您正在使用attr_accessor作为您不需要的订单,因为它是一个数据库字段。

最后,您需要在公司模型上设置attr_accessible :workers_attributes。这允许:workers_attributes创建的accepts_nested_attributes_for哈希通过批量分配来保留。