Cocoon gem，编辑或错误时未建立深度关联

Question

我正在使用Cocoon gem 构建一个嵌套表单，其中一个 field_for 包含另一个 field_for。层次结构如下所示： - 信函形式 -Card field_for -Button field_for

我有一个link_to_add_association，以便通过按钮动态添加卡片。这部分看起来像这样：

<div class="connected-carousels">
                  <div class="stage">
                      <div class="carousel carousel-stage">
                          <ul id="carousel-stage-ul">
                            <%= f.fields_for :cards do |card_fields| %>
                              <% if @blabla %>
                                <%= render 'card_fields', f: card_fields %>
                              <% end %>
                            <% end %>
                            <% end %>
                          </ul>
                        </div>
                        <a href="#" class="prev prev-stage"><span>&lsaquo;</span></a>
                        <a href="#" class="next next-stage"><span>&rsaquo;</span></a>
                    </div>
              <div class="navigation">
                  <a href="#" class="prev prev-navigation">&lsaquo;</a>
                  <a href="#" class="next next-navigation">&rsaquo;</a>
                  <div class="carousel carousel-navigation">
                    <ul id="carousel-navigation-ul"></ul>
                  </div>
              </div>
              <div>
                <%= link_to_add_association '+ Add Card', f, :cards, id: 'add-card-button-bis', data: { association_insertion_node: '#carousel-stage-ul', association_insertion_method: :append } %>
              </div>
            </div>

_card_fields.html.erb 部分渲染按钮：

<% f.object.buttons.build %>
  <%= f.fields_for :buttons do |button_card_fields| %>
      <%= render 'button_fields', f: button_card_fields %>
  <% end %>

_button_fields.html.erb 部分：

<div class="add-button-card-modal">
  <h4>Add New Button</h4>
  <label>Button Text</label>
  <%= f.text_field :button_text, :maxlength => 20, placeholder: "Enter the text to display on the button..." %>
  <br><br>
  <label>Button URL</label>
  <%= f.text_field :button_url, placeholder: "Paste URL..." %>
  <div class="nav-popups-buttons">
    <button type="button" id="validate_new_card_button" class="small-cta2">Add Button</button>
    <p class="remove-link" id="delete_new_card_button">Remove Button</p>
  </div>
</div>

字母模型：

class Letter < ApplicationRecord
  validates :campaign_name, :presence => true

  belongs_to :core_bot
  has_many :messages, dependent: :destroy
  has_many :cards, dependent: :destroy
  has_many :filters, dependent: :destroy
  has_many :analytic_deliveries, dependent: :destroy
  has_many :analytic_reads, dependent: :destroy
  has_many :analytic_sends, dependent: :destroy


  accepts_nested_attributes_for :filters, allow_destroy: true, :reject_if => :all_blank
  accepts_nested_attributes_for :messages, allow_destroy: true, :reject_if => :all_blank
  accepts_nested_attributes_for :cards, allow_destroy: true, :reject_if => :all_blank
end

卡片型号：

class Card < ApplicationRecord
  validates :remote_image_url, :format => URI::regexp(%w(http https)), presence: { message: '%{value} : please enter valid url' }, :allow_blank => true
  validates :title, :subtitle, :presence => true

  belongs_to :letter, optional: true
  has_many :buttons, dependent: :destroy

  accepts_nested_attributes_for :buttons, :reject_if => Proc.new { |att| att[:button_text].blank? && att[:button_url].blank? }, allow_destroy: true
end

按钮型号：

class Button < ApplicationRecord
  validates :button_url, :format => URI::regexp(%w(http https)), presence: { message: '%{value} : please enter valid url' },
    unless: Proc.new { |a| a.button_url.blank? }
  validates :button_text, :presence => true, unless: Proc.new { |a| a.button_url.blank? }

  belongs_to :message, optional: true
  belongs_to :card, optional: true
  has_one :short_url, dependent: :destroy
end

在出现错误时在信控制器中创建操作：

@letter.filters.build

        if params[:letter]['cards_attributes'].present? == false
          @letter.cards.build.buttons.build
        end

        format.html { render :new }
        format.json { render json: @letter.errors, status: :unprocessable_entity }

问题在于，当创建操作引发错误或我编辑记录时，按钮未构建。如果我将@letter.cards.build.buttons.build 添加到控制器中，它会添加一张新卡，但按钮输入仍然没有出现。

更新 事实上按钮是内置的。唯一的问题是我用来显示显示按钮字段的弹出窗口的自定义 jquery 无法正常工作，因为它们是在 cocoon:after-insert 回调中创建的。

当出现错误或在编辑视图上时，我创建的卡片会被渲染，而不是由 link_to_add_association 添加。这个 cocoon:after-insert 回调没有被调用...

知道如何使用 link_to_add_association 的相同逻辑在渲染的卡片字段上调用插入后回调吗？

这是控制台测试，我的按钮在这里：

Answer 1

好的，所以通常其中一个问题中会隐藏一些问题。这个答案只是为了解决为什么Edit 视图总是无法加载。

我最初的猜测是在控制器中，有两个问题...... if params 和 @letter.cards.build.buttons.build 是问题&而不是试图围绕它进行设计 - 你需要改变它，接受任何错误然后修复模型中的错误。第一个修复是从那里获取条件if params。

我还注意到你的字母模型上没有accept_nested_attributes_for :buttons。

最后，在我们开始解决问题之前 - 我忘了询问您的 strong_params 部分 - 请在控制器的私有部分中发布 create 的整个控制器操作和 strong_params 方法。

---

因为它根本没有加载。曾经。这可能不完全是一个 jquery 问题。我们应该看到一个由模型生成的所有卡片和按钮的集合。

我猜.build 方法是第一个问题...

我想如果你检查一下 rails 控制台 ...rails c ...

首先，尝试调用@test = Letter.first，然后在它设置时探索它的值......你应该能够在那里看到其他ID然后能够用@test.{whatever}调用它们......即：@test.cards将给出通过模型中的关系存在的所有卡片的集合。

其次，如果第一个失败，@test.cards.create!(name: "test") 看看关系是否正确创建条目。如果控制台中的@letter.cards.buttons 中出现任何内容，我会很高兴，然后我们稍后会解决您层次结构的其他分支 (letter.filters) 的问题。

第三，我们通过控制台移动生成测试数据，以确保这些值存在并通过 rails 控制器馈送到要显示的视图。

第四，我们检查 jquery 没有干扰它们的显示。

---

演示代码

这是 3 层深嵌套...

请注意，所有这些都对EDIT 有效且无需任何努力，_form.html.erb 中的新建/创建设置只是自动用于编辑。

型号

country.rb

class Country < ApplicationRecord
  has_many  :states
  has_many  :counties, through: :states

  accepts_nested_attributes_for :states, reject_if: proc { |attributes| attributes[:name].blank? }, allow_destroy: true
  accepts_nested_attributes_for :counties, reject_if: proc { |attributes| attributes[:name].blank? }, allow_destroy: true
end

state.rb
class State < ApplicationRecord
  belongs_to  :country
  has_many    :counties

  validates :name, presence: true

  # can't recall if this is needed 
  accepts_nested_attributes_for :counties, reject_if: proc { |attributes| attributes[:name].blank? }, allow_destroy: true
end

county.rb
class County < ApplicationRecord
  belongs_to :state
  validates :name
end

countries_controller.rb ...控制器（你甚至不需要为其他人生成控制器）

class CountriesController < ApplicationController
  before_action :set_country, only: [:show, :edit, :update, :destroy]

  def index
    @countries = Country.paginate(page: params[:page], per_page: 10)
  end

  def show
  end

  def new
    @country = Country.new
  end

  def edit
    # @partial_choice = params[:partial_choice]
  end

  def create
    @country = Country.new(country_params)

    respond_to do |format|
      if @country.save
        format.html { redirect_to @country, notice: 'Country was successfully created.' }
        format.json { render :show, status: :created, location: @country }
      else
        format.html { render :new }
        format.json { render json: @country.errors, status: :unprocessable_entity }
      end
    end
  end

  def update
    respond_to do |format|
      if @country.update!(country_params)
        format.html { redirect_to @country, notice: 'Country was successfully updated.' }
        format.json { render :show, status: :ok, location: @country }
      else
        format.html { render :edit }
        format.json { render json: @country.errors, status: :unprocessable_entity }
      end
    end
  end


  def destroy
    @country.destroy
    respond_to do |format|
      format.html { redirect_to countries_url, notice: 'Country was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

private
  # Use callbacks to share common setup or constraints between actions.
  def set_country
    @country = Country.find(params[:id])
  end


 def country_params
  params.require(:country).permit(:id, :name, :description, :size, :player_id,
     countryneighbor_attritubtes: [:id, :bordercountry_id, :country_id, :_destroy],
     states_attributes: [:id, :name, :description, :country_id, :_destroy,
     counties_attributes: [:id, :name, :description, :state_id, :_destroy]])
  end
end

视图 - 如果您已经在 rails 控制台中测试了数据和关系，strong_params 以及在log/development.log 中检查了服务器日志，那么可以在此处比较视图中的 HAML 样式调用...

/basicB/app/views/countries/_form.html.haml

.fieldset.form-inline
  = simple_form_for @country do |f|
    = f.error_notification
    .countries
      = f.input :name, input_html: {:placeholder => "...insert country name..."}
      = f.input :description
    .row-fuild
      %a.btn.btn-primary{"aria-controls" => "neighborsDisplay", "aria-expanded" => "false", "data-toggle" => "collapse", :href => "#neighborsDisplay"} Show Neighbors
      #neighborsDisplay.collapse
        .list-group
          - for neighbor in @country.neighbors
            = render partial: 'country_neighbors', locals: {neighbor: neighbor}
      .states
      = f.simple_fields_for :states do |state|
        = render 'state_fields', :f => state
    .links.row
      = link_to_add_association 'Add State', f, :states,  render_options: { wrapper: 'inline_form' }, :class => "btn btn-default"
    .form-actions.row
      = f.button :submit

/app/views/countries/_state_fields.html.haml

.nested-fields.list-group-item
    .well
        %h4 State
        .form-inline.text
            = f.input :name, input_html: {:placeholder => "...insert State Name ..."} 
            = f.input :description
            = link_to_remove_association f, class: 'btn btn-default btn-xs' do
                .glyphicon.glyphicon-remove
        .counties
        = f.simple_fields_for :counties do |state|
            = render 'county_fields', :f => state
    .links.row
        = link_to_add_association 'Add County', f, :counties,  render_options: { wrapper: 'inline_form' }, :class => "btn btn-default"    

/app/views/countries/_county_fields.html.haml

.nested-fields.list-group-item.my-well
  .row.text
    = f.input :name, input_html: {:placeholder => "... County Name ..."}
    = f.input :description
    = link_to_remove_association f, class: 'btn btn-default btn-xs' do
      .glyphicon.glyphicon-remove