为什么accepts_nested_attributes_for对我不起作用？ （铁轨3）

Question

我在Rails 3应用程序上使用formtastic和haml。我正在尝试为调查和问题制作一个嵌套表格，但这对我不起作用。我已经看过railscast以及它和所有内容，但我似乎无法使其适用于我的应用程序。所以现在，我有以下内容：

模型

class Survey < ActiveRecord::Base
  attr_accessible :intro, :name, :pubdate, :enddate, :pubid

  belongs_to :user
  has_many :questions, :dependent => :destroy, :autosave => true

  accepts_nested_attributes_for :questions, :allow_destroy => true
end

class Question < ActiveRecord::Base

  belongs_to :survey
  has_many :answers, :dependent => :destroy

  attr_accessible :q_text, :order, :q_type

end

相关控制器方法

def update
  @survey = Survey.find(params[:id])
  @user = current_user
  if check_auth_and_redirect @user, @survey
    if @survey.update_attributes(params[:survey])
      flash[:success] = "Survey Updated"
      redirect_to edit_survey_path(@survey)
    else
      @title = "Editing Survey #{@survey.id}"
      render 'edit'
    end
  end
end

视图

= semantic_form_for @survey do |f|
  = render "shared/survey_inputs", :object => f
  = f.inputs :for => :questions, :name => "Survey Questions" do |fq|
    %hr
    = fq.input :q_text, :label => "Question text"
    = fq.input :q_type, 
               :label => "Question type", 
               :as => :select,
               :collection => %w(text scale radio select)
    = fq.input :order, :label => "Question order"

表单呈现正确，但是当我更改问题并单击“保存”时，记录不会反映我的更改。我确实打开了调试（params），这是它的回复：

--- !map:ActiveSupport::HashWithIndifferentAccess 
      utf8: "\xE2\x9C\x93"
      _method: put
      authenticity_token: CJCc9LvdoPjxwGJkhUnZjR0Z/c5Wt5VBT3bBr/wB4+A=
      survey: !map:ActiveSupport::HashWithIndifferentAccess 
        name: This is my survey
        intro: I've got a lovely bunch of coconuts. There they are all standing in a row.
        pubid: smargdab
        pubdate(1i): ""
        pubdate(2i): ""
        pubdate(3i): ""
        enddate(1i): ""
        enddate(2i): ""
        enddate(3i): ""
        questions_attributes: !map:ActiveSupport::HashWithIndifferentAccess 
          "0": !map:ActiveSupport::HashWithIndifferentAccess 
            q_text: one one one one one one one one one one one
            q_type: text
            order: "3"
            id: "1"
          "1": !map:ActiveSupport::HashWithIndifferentAccess 
            q_text: 2 2 2 2 2 2 2 2 2 2
            q_type: text
            order: "1"
            id: "2"
          "2": !map:ActiveSupport::HashWithIndifferentAccess 
            q_text: 3 3 3 3 3 3 3 3 3 3
            q_type: text
            order: "2"
            id: "3"
      commit: Update Survey
      action: update
      controller: surveys
      id: "2"

我在这里做错了什么？我不想手动编写这些属性转换器！

Answer 1

我正在查看一些使用accepts_nested_attributes_for的旧代码，我认为你需要做的是改变

attr_accessible :intro, :name, :pubdate, :enddate, :pubid

到

attr_accessible :intro, :name, :pubdate, :enddate, :pubid, :questions_attributes

Answer 2

我不允许在attr_accessible中使用某些东西。问题是，我不知道该允许什么。我认为这是questions_attributes，但似乎并没有这样做。