应用到动态创建的嵌套表单时处理单选按钮

Question

我有一个应用程序， users可以在其中创建自己的forms ，然后将其应用于自己的clients

forms是动态创建的，这意味着用户可以添加他们想要的尽可能多的questions ，并且每个问题都有很多choices （例如调查结构）。

到目前为止，到目前为止，我在应用表格时一直在挣扎，尤其是在保存answers保留answers并在呈现edit视图时正确显示answers 。

呈现edit视图时，每个问题的选择都将乘以Answered_form有多少个问题/答案（我不知道确切是哪个，我在这里猜测）。

Answers会保留在数据库中，尽管每个问题的选择都会成倍增加，但选中的答案会被检查并在原始答案的集合中被选中。 （回答前三个选择中的一个，第二三个选择中的两个，第三三个选择中的三个，第四三个选择中的四个）

我已经在SO中阅读了2个类似的问题， RoR的嵌套属性在edit时会产生重复 ，而嵌套的表单更新操作会产生重复的结果 ，但是我已经在强参数中使用了:id （您可以在下面的代码中看到它）。

我想在这里澄清一下： 使用嵌套的问题和嵌套的选项创建表单工作得很好，并且还可以编辑创建的表单。 困难在于何时在应用程序中使用，回答或应用它 。

码：

_form.html.erb：

<%= form_for [@child, @answered_form] do |f| %>

  <%= f.hidden_field :form_id %>
  <%= f.hidden_field :child_id %>

  <div class="answered_form">

  <h1><%= @form.f_title %></h1>
  <h3><%= @form.f_description %></h3>
  <br>
  <% questions = @form.questions %>
  <% i = 1 %>
  <% questions.each do |question| %>

    <%= i.to_s + ". " %><%= question.q_title %>
    <br />
    <% choices = question.choices %>

    <%= f.fields_for :answers do |a| %>

      <% choices.each do |choice| %>

        <%= a.radio_button :a_content, choice.c_description %> 
        <%= a.label :a_content, choice.c_description, :value => choice.c_description, class: 'no-margin' %>
        <br />

      <% end %>

    <% end %>

     <br />
     <% i += 1 %>
  <% end %>

</div>

<div class="text-center">
  <%= f.submit yield(:button_text), class: "btn btn-primary btn-lg" %>
</div>

<% end %>

answer_forms_controller.rb：

class AnsweredFormsController < ApplicationController
  before_action :correct_answered_form,  only: [:edit, :update, :destroy]

  def new
    @child = current_user.children.find(params[:child_id])
    @form = current_user.forms.find(params[:form_id])
    @answered_form = @child.answered_forms.new(form_id: params[:form_id])
    @answered_form.answers.build
  end

  def create
    @answered_form = AnsweredForm.create(answered_form_params)
    if @answered_form.save
      flash[:success] = "New survey " + @answered_form.form.f_title + " applied to patient!"
      redirect_to current_user.children.find(params[:child_id])
    else
      render 'new'
    end
  end

  def edit
    @child = current_user.children.find(params[:child_id])
    @form = current_user.forms.find(params[:form_id])
  end

  def update
    if @answered_form.update_attributes(answered_form_params)
      flash[:success] = "Survey updated!"
      redirect_to @answered_form.child
    else
      render 'edit'
    end
  end

  def show
  end

  def destroy
    @child = current_user.children.find(params[:child_id])
    @form = current_user.forms.find(params[:form_id])
    @answered_form.destroy
    redirect_to :back
  end

  private

    # Strong params for creating and updating forms
    def answered_form_params
      params.require(:answered_form).permit(:form_id, :child_id, answers_attributes: [:id, :a_content, :a_boolean, :_destroy, :choice_id])
    end

    # Confirms the correct answered_form
    def correct_answered_form
      @answered_form = AnsweredForm.find(params[:id])
    end

end

日志： POST：

Started POST "/children/1-juan-gomez-pereira/answered_forms" for ::1 at 2016-07-08 11:55:01 -0400
Processing by AnsweredFormsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"hFrRfEwVG4XSkdbPwrohm1QEQ0FtE/as3sM2Fj3Av3reVHJxZBVKPeuAeD713H7gVyZn7eppnULDhLJQz+EBeg==", "answered_form"=>{"form_id"=>"1", "child_id"=>"1", "answers_attributes"=>{"0"=>{"a_content"=>"Bajo"}, "1"=>{"a_content"=>"Sí"}, "2"=>{"a_content"=>"Derecha"}, "3"=>{"a_content"=>"Pesado"}}}, "commit"=>"Aplicar", "child_id"=>"1-juan-gomez-pereira"}

补丁：

Started PATCH "/children/1-juan-gomez-pereira/answered_forms/3" for ::1 at 2016-07-08 11:55:54 -0400
Processing by AnsweredFormsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"oGdqgUR95HMkMff40Gq1zWar/CH64F0jsN3oRHT1q/H6acmMbH21yx0gWQnnDOq2ZYnYjX2aNs2tmmwChtQV8Q==", "answered_form"=>{"form_id"=>"1", "child_id"=>"1", "answers_attributes"=>{"0"=>{"a_content"=>"Bajo", "id"=>"9"}, "1"=>{"a_content"=>"Bajo", "id"=>"10"}, "2"=>{"a_content"=>"Bajo", "id"=>"11"}, "3"=>{"a_content"=>"Confuso", "id"=>"12"}, "4"=>{"a_content"=>"No", "id"=>"9"}, "5"=>{"a_content"=>"Sí", "id"=>"10"}, "6"=>{"a_content"=>"Confuso", "id"=>"11"}, "7"=>{"a_content"=>"Confuso", "id"=>"12"}, "8"=>{"a_content"=>"Confuso", "id"=>"9"}, "9"=>{"a_content"=>"Izquierda", "id"=>"10"}, "10"=>{"a_content"=>"Confuso", "id"=>"11"}, "11"=>{"a_content"=>"Izquierda", "id"=>"12"}, "12"=>{"a_content"=>"Liviano", "id"=>"9"}, "13"=>{"a_content"=>"Liviano", "id"=>"10"}, "14"=>{"a_content"=>"Pesado", "id"=>"11"}, "15"=>{"a_content"=>"Liviano", "id"=>"12"}}}, "commit"=>"Actualizar", "child_id"=>"1-juan-gomez-pereira", "id"=>"3"}

我注意到在POST时，答案的id没有作为参数传递。 如果我检查控制台，则可以看到答案已正确创建。

Answer 1

我认为这可能是问题所在

<% choices.each do |choice| %>

如果您已经构建了question.answers ，则只能使用f.fields_for :answers对其进行迭代，并跳过上面的行。 我认为choices与answers没有太大不同。

如果我错了，请告诉我。

Answer 2

所以问题出在这行代码：

<%= f.fields_for :answers do |a| %>

fields_for辅助函数会为您要为其调用的对象的整个集合生成字段。

在这种情况下， @answered_form创建后有4个answers ，因此在编辑中调用fields_for时，它将为每个问题生成4个字段。

为了解决这个问题，您需要指定一个适合您需求的集合，并将其通过fields_for助手：

<%= f.fields_for :answers, ANSWERS_COLLECTION do |a| %>