Ruby 接受rails3.1rc4的\u嵌套\u属性\u

我在模型中使用accepts_nested_attributes_，但我的子窗体未保存在数据库中

我正在构建一个嵌套表单，几乎与Ryan Bates railscasts在第196/197集中的方式相同。我有一张家长问题表和作为孩子的答案表：

models/question.rb

class Question < ActiveRecord::Base
  belongs_to :user
  has_many :answers, :dependent => :destroy
  accepts_nested_attributes_for :answers, :reject_if => lambda { |a| a[:text].blank? }, 
                                :allow_destroy => true

  validates :content, :presence => true
end

类问题：毁灭
接受_嵌套的_属性_for:answers，:reject _if=>lambda{a | a[：text].blank？}，
：allow_destroy=>true
验证：content，：presence=>true
结束

模型/答案.rb

class Answer < ActiveRecord::Base
    belongs_to :question
  belongs_to :user
end

class-Answer

控制器/问题\u controller.rb

class QuestionsController < ApplicationController

  before_filter :authenticate_user!

  def index
    setup_questions
  end

  def create    
    @question = Question.new(params[:question])

    #this is to get every id_key from the user into the params of the answer
    params[:question][:answers_attributes].keys.each {|key| params[:question][:answers_attributes][key][:user_id] = current_user.id }

    @question.user_id = current_user.id

    if @question.save
      redirect_to questions_path, :notice => "Successfully created question."
    else
      setup_questions
      render :index
    end
  end

  def edit
        @question = Question.find(params[:id])  
  end

  def update
     @question = Question.find(params[:id])
      respond_to do |format|
        if @question.update_attributes(params[:question])
          format.html { redirect_to(@question, :notice => 'Question was successfully updated.') }
          format.xml  { head :ok }
        else
          format.html { render :action => "edit" }
          format.xml  { render :xml => @question.errors, :status => :unprocessable_entity }
        end
      end 
  end

  def show
    @question = Question.find(params[:id])
  end

  def destroy
    @question = Question.find(params[:id])
    #authorize! :destroy, @question
    @question.destroy
    redirect_to questions_path, :notice => "Successfully deleted question: #{@question.content}."      
  end


  private

  def setup_questions
    @questions = Question.all
    @question ||= Question.new
    @question.answers.build #to build the answers form
  end
end

类问题控制器“已成功创建问题。”
其他的
设置问题
渲染：索引
结束
结束
定义编辑
@question=question.find（参数[：id]）
结束
def更新
@question=question.find（参数[：id]）
回应待办事项|格式|
如果@question.update_属性（参数[：question]）
format.html{redirect_to（@question，：notice=>“问题已成功更新”）}
format.xml{head:ok}
其他的
format.html{render:action=>“edit”}
format.xml{render:xml=>@question.errors，：status=>:unprocessable_entity}
结束
结束
结束
def秀
@question=question.find（参数[：id]）
结束
def销毁
@question=question.find（参数[：id]）
#授权！：摧毁，@问题
@问题.销毁
将_重定向到问题路径：notice=>“已成功删除问题：#{@question.content}。”
结束
私有的
def设置问题
@问题
@问题| |=新问题
@question.answers.build#构建答案表单
结束
结束

视图/问题/_form.html.erb

<%= form_for(@question) do |f| %>

<!-- =================== -->
<!-- = Error handeling = -->
  <% if @question.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@question.errors.count, "error") %> prohibited this question from being saved:</h2>

      <ul>
      <% @question.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>
<!-- =================== -->

<!-- ================= -->
<!-- = Question form = -->
  <div class="field">
    <%= f.label :content, "Question" %><br />
    <%= f.text_field :content, :placeholder => "type your question here.." %>
  </div>
<!-- ====================== -->

<!-- = Nested Answer form = -->
    <div class="answer-field">
        <%= f.fields_for :answers do |builder| %>
            <%= builder.label :content, "Possible answer" %><br />
            <%= builder.text_field :content, :placeholder => "type an optional answer.." %>
        <% end %>
    </div>
<!-- ====================== -->

  <div class="actions">
    <%= f.submit %>
  </div>

<!-- ================= -->
<% end %>

禁止保存此问题：





“在此处键入您的问题…”%>


“键入可选答案…”%>

所以现在最大的问题是。。。为什么它不将应答字段中的任何内容保存到数据库中？我认为在父级（问题）执行一次创建操作就足够了，并且“接受\u嵌套的\u属性\u for”应该处理它的子级

问候,，

---

Thijs

1从控制器中删除此线路

params[:question][:answers_attributes].keys.each {|key| params[:question][:answers_attributes][key][:user_id] = current_user.id }

2将此添加到您的视图中

<!-- = Nested Answer form = -->
  <div class="answer-field">
    <%= f.fields_for :answers do |builder| %>
      <% builder.object.user = current_user %>
      <%= builder.label :content, "Possible answer" %><br />
      <%= builder.text_field :content, :placeholder => "type an optional answer.." %>
      <%= builder.hidden_field, :user_id %>
    <% end %>
  </div>
<!-- ====================== -->

“键入可选答案…”%>

1从控制器中删除此线路

params[:question][:answers_attributes].keys.each {|key| params[:question][:answers_attributes][key][:user_id] = current_user.id }

2将此添加到您的视图中

<!-- = Nested Answer form = -->
  <div class="answer-field">
    <%= f.fields_for :answers do |builder| %>
      <% builder.object.user = current_user %>
      <%= builder.label :content, "Possible answer" %><br />
      <%= builder.text_field :content, :placeholder => "type an optional answer.." %>
      <%= builder.hidden_field, :user_id %>
    <% end %>
  </div>
<!-- ====================== -->

“键入可选答案…”%>

谢谢，但答案表中仍然没有保存任何内容。。。？我真的不明白为什么？我想我已经知道我做错了什么。。。愚蠢，愚蠢…：接受嵌套的属性用于：答案，：拒绝如果=>lambda{a}a[：text].blank？}，：允许销毁=>true必须是：接受嵌套的属性用于：答案，：拒绝如果=>lambda{a}a[：content].blank？}，：允许销毁=>truethanks，但答案表中仍然没有保存任何内容。。。？我真的不明白为什么？我想我已经知道我做错了什么。。。愚蠢，愚蠢…：接受嵌套的属性用于：答案，：拒绝如果=>lambda{a}a[：text].blank？}，：允许销毁=>true必须是：接受嵌套的属性用于：答案，：拒绝如果=>lambda{a}a[：content]。blank？}，：允许销毁=>true