處理單選按鈕將創建一個嵌套的表格時動態

Question

我有一個應用程序，其中users可以創建自己的forms，然後將它們運用到自己的clients

的forms是動態創建的，這意味着用戶可以添加儘可能多的questions他們想要的，而且每個問題都有很多choices（想想調查結構）。

到目前爲止很好，現在我在應用表單時很掙扎，特別是在渲染edit視圖時，answers保存，保持並正常顯示。

當呈現edit視圖時，每個問題都有他們的選擇乘以answers_form有多少個問題/答案（我不確切知道他們中哪些是我在這裏猜測的）。

Answers被持久化到數據庫中，儘管每個問題都有其選擇倍增，所選答案將被檢查並在原始答案的集合中進行檢查。 （在前3個選項中選中一個，在第二個3個選項中回答兩個，在第三個3個選項中回答三個，在第三個選項中回答四個）

我已經在SO中讀過2個類似的問題，RoR nested attributes produces duplicates when edit和Nested form update action producing duplicate results，但我已經有了強大的參數:id（您可以在下面的代碼中看到它）。

我想在這裏明確：創建窗體，嵌套的問題和嵌套的選擇工作得很好，並且還編輯創建的窗體。奮鬥是在APP中使用，回答或應用。

代碼：

_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 %> 

answered_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 

日誌： 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"} 

PATCH：

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，當POST，該id的答案是不作爲參數傳遞。如果我檢查控制檯，我可以看到答案已正確創建。

Answer 1

所以問題在這行代碼：

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

fields_for輔助生成對他們來說，你在呼喚它的對象的整個集合場。

在這種情況下，@answered_form在創建後有，因此在編輯時調用fields_for時，它會爲每個問題生成4個字段。

爲了解決這個問題，你需要指定符合自己需求的收集和傳遞通過fields_for幫手：

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

Answer 2

我覺得這條線可能是問題

<% choices.each do |choice| %> 

如果你已經建立question.answers，你可以對它們進行迭代只用f.fields_for :answers並跳過上述行。我假設choices與answers沒有太大的區別。

如果我錯了，請清除我。