Question

我似乎无法弄清楚为什么Mongoid在创建新父项时不会为子对象设置嵌套属性。我想创建一个新的Folio，添加一个子功能，然后将其推送到Profile上的Folios数组。

我有一个配置文件，其中嵌入了许多Folios，它嵌入了许多功能：

class Profile
  include Mongoid::Document
  include Mongoid::Timestamps::Updated

  #regular fields here; removed for brevity

  embeds_many :folios, class_name: "Folio"
end

class Folio
  include Mongoid::Document
  include Mongoid::Timestamps::Updated

  accepts_nested_attributes_for :features
  embedded_in :profile

  field :name
  field :desc
  field :order, type: Integer, default:0
  embeds_many :features

  attr_accessible :name, :desc, :order  
end

class Feature
  include Mongoid::Document
  include Mongoid::Timestamps::Updated

  embedded_in :folio
  belongs_to :project

  field :content_type, type: Integer  #ContentType
  field :content_id
  field :txt, type: String
  field :order, type: Integer, default:0

  attr_accessible :project_id, :content_type, :content_id, :txt, :order
end

控制器：

  def new
    @folio = Folio.new
    @folio.features.build
  end

  def create
    @folio = Folio.new(params[:folio])

    #@folio.features is still empty here.

    @profile.folios << @folio
    @profile.save
    render "create_or_update.js"
  end

在create中，param hash看起来不错：

{"folio"=>{"id"=>"new", "name"=>"new name", "desc"=>"new description", "features_attributes"=>{"0"=>{"project_id"=>"4ea0b68e291ebb44a100000a", "content_type"=>"1", "content_id"=>"4ea0b68e291ebb44a100000d", "txt"=>"note here"}}}, "commit"=>"Save", "action"=>"create", "controller"=>"folios"}

但是@ folio.features仍然是空的。

如果我记得，这对AR很好。奇怪的是，Folio上没有features_attributes =（）方法。我认为嵌套属性需要工作吗？我错过了什么？

这是在带有Mongoid 2.2.3的Rails 3.1上。

Answer 1

您是否尝试为Folio文档中的功能启用 AutoSave 为true

class Folio
  include Mongoid::Document
  include Mongoid::Timestamps::Updated

  accepts_nested_attributes_for :features , :autosave => true
  embedded_in :profile
end

为什么mongoid不在new（）上添加我的嵌套属性？

1 个答案: