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我是 ruby​​ on rails 的新手，我拼命想让嵌套表单真正工作。所以我创建了一个简单的小应用程序来尝试使用 Cocoon 使其工作。

这个想法是：

  1. 创建一个始终分配给“部分”的嵌套“问题”
  2. 创建“部分”时，应该可以添加嵌套的“问题”并与该部分关联

目前我可以看到问题的字段，输入我的数据，但是当我点击“提交”时。问题不会保存到数据库中。我不知道为什么，我不知道如何添加它们，

所以......这里有一些代码要仔细阅读：

我的部分形式部分：

%h2 Sections
= semantic_form_for @section do |f|
  = f.inputs do
    = f.input :title

    %hr
    - @section.printQuestions @section
    %hr

    %h3 Questions
    #questions
    = f.semantic_fields_for :questions do |question|
      = render 'question_fields', :f => question
    .links
      = link_to_add_association 'add question', f, :questions, :data => {"association-insertion-method" => "after" }
      %p 
    %input{type: 'submit', value: 'Submit'}

-- 当点击提交时，该部分被保存，但新制作的问题不被保存

在部分目录中找到的“问题”部分：

.question_fields
  = f.inputs do
    %p
      = f.label :question_text
      %br
      = f.text_area :question_text, :rows => 2, :cols => 40
    %p
      = f.label :answer_text
      %br
      = f.text_area :answer_text, :rows => 3, :cols => 60
    = f.input :section_id, input_html: { readonly: true }
    = link_to_remove_association "remove question", f

模型权限：

class Section < ActiveRecord::Base
  has_many :questions
  accepts_nested_attributes_for :questions
end

class Question < ActiveRecord::Base
  belongs_to :section
end


class QuestionsController < ApplicationController
  before_action :set_question, only: [:show, :edit, :update, :destroy]
    ## the rest is auto-generated
end


class SectionsController < ApplicationController
  before_action :set_section, only: [:show, :edit, :update, :destroy]


  def section_params
    params.require(:section).permit(:id, :title, :body, :good_opinion, :image_file_name, :questions_attributes [:id, :question_text, :answer_text, :section_id, :_destroy])
    accepts_nested_attributes_for :questions
  end
end

代码运行时的输出：

Started PATCH "/sections/5" for 127.0.0.1 at 2014-03-25 00:01:24 -0400
Processing by SectionsController#update as HTML
  Parameters: {"utf8"=>"√", "authenticity_token"=>"x6rDCAMjUrdLCieWPOtwsKvqNrVVkGjv6fuZYwmJRSY=", "section"=>{"id"=>"5", "title"=>"question text", "i
mage_file_name"=>"image.png", "good_opinion"=>"0", "body"=>"body text", "questions_attributes"=>{"1395720076660"=>{"question_text"=>"qqqqqqqqqqqqqq",
 "answer_text"=>"aaaaaaaaaaaaaa", "section_id"=>"5", "_destroy"=>"false"}}}, "id"=>"5"}
  ←[1m←[35mSection Load (1.0ms)←[0m  SELECT "sections".* FROM "sections" WHERE "sections"."id" = ? LIMIT 1  [["id", "5"]]
Unpermitted parameters: id, questions_attributes
  ←[1m←[36m (0.0ms)←[0m  ←[1mbegin transaction←[0m
  ←[1m←[35m (0.0ms)←[0m  commit transaction
Redirected to http:5
Completed 302 Found in 46ms (ActiveRecord: 1.0ms)
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