Question

我正在尝试构建一个非常简单的嵌套表单应用程序，以学习rails。在这个应用程序中，我有三个模型legal_form answer和question。我有我的answers.html.erb，设置如下：

<%= form_for (@legal_form) do |f| %>
<h1>Title <%= @legal_form.title %></h1>
<p><%= @legal_form.description %></p>
<ul>
  <% @legal_form.questions.each do |question| %>
    <%= fields_for question.answers.build do |q| %>
      <li>
        <%= question.question_content %>
        <%= q.text_field :answer_content %>
      </li>
    <% end =%>
  <% end %>
</ul>

<p><%= f.submit "Submit" %></p>
<% end %>

目前正在抓取我存储的三个问题并在它们旁边呈现文本输入框;工作没有问题。但是，当我提交值时，我得到“param is missing or empty：legal_form”。

我认为这很可能是由于legal_forms控制器中我强大的params配置，见下文。

class LegalFormsController < ApplicationController
  before_action :find_legal_form, only: [:show, :edit, :update, :destroy, :answers]

  def index
    @legal_form = LegalForm.all.order("created_at DESC")
  end

  def show
  end

  def new
    @legal_form=LegalForm.new
  end

  def create
    @legal_form = LegalForm.new(legal_form_params)

    if @legal_form.save
      redirect_to @legal_form, notice: "Successfully created new legal form."
    else
      render 'new'
    end
  end

  def edit
  end

  def update
    if @legal_form.update(legal_form_params)
      redirect_to @legal_form
    else
      render 'edit'
    end
  end

  def destroy
    @legal_form.destroy
    redirect_to root_path, notice: "Successfully deleted form"
  end

  def answers
    @questions=@legal_form.questions
    @legal_form=LegalForm.find(params[:id])
  end
  private

  def legal_form_params
    params.reqire(:legal_form).permit(:title, :description, :questions_attribute => [:id, :question_number, :question_content, :_destroy, :answer_attributes => [:id, :answer_content, :question_id, :user_id]])
  end

  def find_legal_form
    @legal_form=LegalForm.find(params[:id])
  end
end

并且，如果它有用，这里是每个模型。

class Answer < ActiveRecord::Base
  belongs_to :question
end

class LegalForm < ActiveRecord::Base
  has_many :questions, :dependent => :destroy

  has_many :answers, through: :entity_roles

  accepts_nested_attributes_for :questions,
  reject_if: proc { |attributes| attributes['question_content'].blank? },
  allow_destroy: true

end

class Question < ActiveRecord::Base
  belongs_to :legal_form
  has_many :answers
  accepts_nested_attributes_for :answers,
  reject_if: proc { |attributes| attributes['question_content'].blank? },
  allow_destroy: true
end

此外，根据要求，我的路线文件：

Rails.application.routes.draw do
  resources :legal_forms do
    member do
      get 'answers'
    end
  end

  resources :answers

  root "legal_forms#index"
end

任何有助于最终征服嵌套表格的帮助将不胜感激。我一直在敲打我的脑袋，持续一周左右。非常感谢提前。

Answer 1

尝试使用控制器

def legal_form_params
  params.require(:legal_form).permit(...)
end

另外，question.answers.build将它添加到控制器的方法中并调用返回对fields_for的响应的对象

<强>更新

要通过此表单发送您的结果，应该是这样的

形式

<%= f.fields_for :answers do |q| %>
      ...
<% end =%>

在新方法中

 def new
    @legal_form=LegalForm.new
    @answers = @legal_form.question.answers.build
 end

def legal_form_params
   params.require(:legal_form).permit! #temporarily
end

没试过，但想象一下它是如何工作的

嵌套形式中“param缺失或值为空”

1 个答案: