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我已经完全按照描述在我的 rails 4 应用程序中安装了cocoon gem 。这在父模型表单中非常有效，允许用户为子模型添加/删除字段。我遇到麻烦的地方是子对象的提交。如果子模型是在父模型的新操作中构建的，那么无论创建了多少模型，我都可以准确地提交，仅此而已。从提交的参数中可以明显看出这一点，因为它们包含 child_attributes（或者不包含，如果控制器中没有构建子模型）。

目前正在运行

导轨 4.2.10

红宝石 2.5.1

茧 1.2.14

jquery-rails 4.3.3

jquery-ui-rails 6.0.1

代码片段

class EventsController < ApplicationController
  before_action :authenticate_user!, only: [:new, :create]

  def new
    @event = Event.new
    @event.competitions.build
  end

  def create
    @event = current_user.events.create(event_params)
    if @event.valid?
      flash[:notice] = "Event created"
      redirect_to events_path
    else
      flash[:alert] = "Event not created.  Please check for errors in the form and try again."
      render :new, status: :unprocessable_entity
    end
  end

def event_params
    params.require(:event).permit(
                                  :event_name,
                                  :event_start,
                                  :event_end,
                                  :event_address,
                                  competitions_attributes: [:id, :competition_name, :maximum_participants, :type_id, :fee, :_destroy]
    )
  end
end

父模型

  acts_as_paranoid
  has_and_belongs_to_many :users
  has_many :competitions, dependent: :destroy, inverse_of: :event
  belongs_to :address
  accepts_nested_attributes_for :address
  accepts_nested_attributes_for :competitions, allow_destroy: true

儿童模型

class Competition < ActiveRecord::Base
  acts_as_paranoid
  belongs_to :event
  has_many :participants, dependent: :destroy
  belongs_to :type
  accepts_nested_attributes_for :participants, allow_destroy: true

表单 (new.html.erb)

  <div class="text-left ">
    <%= simple_form_for @event do |f| %>
        <%= f.input :event_name, input_html: {maxlength: 60} %>
        <%= f.input :logo, label: "Event Logo:", hint: 'jpg or png files allowed, max size: 1MB' %>
        <a <%= f.input :description, label_html: {class: "glyphicon glyphicon-question-sign event-new", href: "#", 'data-content': "You can format your description using the editor buttons. Cutting and pasting from other text editors will not work unless they are first exported into html format. For security reasons, some html tags are not allowed and will be removed.", rel: "popover", "data-placement": 'top', 'data-original-title': 'WYSIWYG editor help', 'data-trigger': 'hover' }, as: :ckeditor, input_html: { ckeditor: { toolbar: 'mini' } } %></a>
        <%= f.input :event_address, placeholder: "Enter Street Address, City, State, Postal Code" %>
        <%= f.input :registration_fee, :input_html => { :value => '0.00'}, label: "Team registration fee" %>


        <%= f.input :event_start %>
        <%= f.input :event_end %>
        <br />
        <h3>Competitions</h3>
        <div id="competitions">
          <%= f.simple_fields_for :competitions do |competition| %>
            <%= render 'competition_fields', f: competition %>
          <% end %>
          <div class="links">
            <%= link_to_add_association 'add competition', f, :competitions %>
          </div>
        </div>

        <%= f.submit 'Create', :class => 'pull-right btn btn-primary' %>
    <% end %>
  </div

部分（命名为 _competition_fields.html.erb

<div class="nested-fields">
  <%= f.input :competition_name %>
  <%= f.collection_select(:type_id, @types, :id, :name, prompt: "Select a Type") %>
  <%= f.input :fee, :input_html => { :value => '0.00'} %>
  <%= f.input :maximum_participants %>
  <%= link_to_remove_association "Delete Competition", f %>
</div>

应用程序.js

//= require jquery
//= require bootstrap-sprockets
//= require jquery_ujs
//= require dataTables/jquery.dataTables
//= require jquery-ui/widgets/autocomplete
//= require autocomplete-rails
//= require moment
//= require bootstrap-datetimepicker
//= require ckeditor/init
//= require google_analytics
//= require cocoon
//= require_tree .

表格中部分组件的图像，注 2 提交的比赛

从 Rails 控制台（插入父模型后）

"competitions_attributes"=>{"0"=>{"competition_name"=>"test1", "type_id"=>"2", "fee"=>"0.00", "maximum_participants"=>"8", "_destroy"=>"false"}}}, "commit"=>"Create"}

  SQL (17.4ms)  INSERT INTO "competitions" ("competition_name", "maximum_participants", "type_id", "fee", "event_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5, $6, $7) RETURNING "id"  [["competition_name", "test1"], ["maximum_participants", 8], ["type_id", 2], ["fee", "0.0"], ["event_id", 305], ["created_at", "2019-08-01 11:13:44.582299"], ["updated_at", "2019-08-01 11:13:44.582299"]]

我已经解决了 gem 设置的所有常见问题（accepts_nested_attributes_for、inverse_of、child_fields 部分的命名和缩进、安装了 jQuery 并调用了 cocoon 等）据我所知，这一切都符合规范。只要在新动作中构建子模型，它就可以工作。

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1 回答 1

1

啊！多么令人瞩目的时刻。<a>结果发现ckeditor描述字段上的标签引起了这一切。移除<a>标签后，cocoon 可以正常运行。

因此，回答最初的问题：不，cocoon gem 甚至不需要在新的控制器操作中构建一个子模型来添加它们。

于 2019-08-02T23:38:31.843 回答