ruby-on-rails - Rails 4 嵌套形式。

Question

我正在为客户构建动态表单。一个表格有许多表格问题，而表格问题又有许多表格答案。到目前为止，我可以在 Active Admin 中很好地创建所有内容，并通过应用程序界面上的显示操作将其显示出来。这是我遇到的问题。我想显示表单标题(正在运行)、表单问题(正在运行)以及用于动态提交新表单答案的输入字段(这是不起作用的部分)。我觉得在嵌套表单方面我已经用尽了一切。我将在下面发布我的代码。

表格

<%= form_for @form do |f| %>
  <div class="field">
    <h1><%= @form.name %></h1>
  </div>
  <%= f.fields_for :form_questions do |ff| %>
    <div class="field">
      <%= ff.label :title  %>
      <%= ff.text_field :form_answers %>
    </div>
  <% end %>
  <div class="form-actions">
    <%= f.button :submit %>
  </div>
<% end %>

这是模型

class Form < ActiveRecord::Base
  has_many :form_questions, dependent: :destroy
  accepts_nested_attributes_for :form_questions, allow_destroy: true
end

<小时/>

class FormQuestion < ActiveRecord::Base
  belongs_to :form
  has_many :field_types
  has_many :form_answers, dependent: :destroy
  accepts_nested_attributes_for :field_types
  accepts_nested_attributes_for :form_answers
end

<小时/>

class FormAnswer < ActiveRecord::Base
  belongs_to :form_question
end

<小时/>

还有我的表单 Controller

class FormsController < ApplicationController

  def new
    @form = Form.new
    # form_questions = @form.form_questions.build
    # form_answers = form_questions.form_answers.build
  end

  def create
    @form = Form.new(form_params)
  end

  def index
    @forms = Form.includes(:form_questions).all
  end

  def show
    @form = Form.find(params[:id])
  end

  def edit
    @form = Form.find(params[:id])
  end

  def form_params
    params.require(:form).permit(:id, :name, form_questions_attributes: [:title, form_answers_attributes: [:answer]])
  end


end

Answer 1

首先，您应该在 new 方法中取消注释这两行。我猜它们是正确的。

def new
 @form = Form.new
 @form_questions = @form.form_questions.build
 @form_answers = @form_questions.form_answers.build
end

并且在您的创建操作中，您没有保存数据

def create
 @form = Form.new(form_params)
 if @form.save
   .....
 else
  .....
 end
end

其次，您的表单代码应如下所示

<%= form_for @form do |f| %>
  <div class="field">
    <h1><%= @form.name %></h1>
  </div>
  <%= f.fields_for @form_questions do |ff| %>
    <div class="field">
      <%= ff.label :title %>
      <%= ff.text_field :title %>
    </div>  
    <%= ff.fields_for @form_answers do |fa| %> #Here comes the important step
      <div class="field" %>
        <%= fa.label :answer %>
        <%= fa.text_field :answer %>
      </div>
    <% end %> 
  <% end %>
  <div class="form-actions">
    <%= f.button :submit %>
  </div>
<% end %>