Question

我正在使用cocoon gem来嵌套表单。我的rails版本是4.2.6。

两个模型之间的关联设置如下

Question.rb

class Question
  include Mongoid::Document
  field :title, type: String
  has_many :choice_options, dependent: :destroy
  accepts_nested_attributes_for :choice_options, :reject_if => :all_blank, :allow_destroy => true
  validates :topic, presence: true
end

ChoiceOption.rb

class ChoiceOption
  include Mongoid::Document
  field :title, type: String
  belongs_to :question
end

我在问题控制器

中设置new和question_params如下

questions_controller.rb

class QuestionsController < ApplicationController

      def new
        @question = Question.new
      end

        private

      def question_params
        params.require(:question).permit(:title, choice_options_attributes: [:id, :title, :_destroy])
      end
end

创建新问题和嵌套选择的部分表单如下。

视图/问题/ _form.html.erb

<%= form_for @question do |f| %>
  <%= render 'shared/errors', object: @question %>

  <div class="form-group">
    <%= f.label :title %>
    <%= f.text_area :title, rows: 3, required: true, class: 'form-control' %>
  </div>

  <div class="panel panel-default">
    <div class="panel-heading">Options</div>
    <div class="panel-body">
      <%= f.fields_for :choice_options do |options_form| %>
        <%= render 'choice_option_fields', f: options_form %>
      <% end %>

      <div class="links">
        <%= link_to_add_association 'add option', f, :choice_options %>
      </div>
    </div>
  </div>

  <%= f.submit 'Create', class: 'btn btn-primary btn-lg' %>
<% end %>

然后我创建了一个部分表单供我在上一页中呈现的选项。

视图/问题/ _choice_option_fields.html.erb

<div class="nested-fields">
  <div class="form-group">
    <%= f.label :title %>
    <%= f.text_field :title, class: 'form-control', required: true %>
  </div>
  <%= link_to_remove_association "remove option", f %>
</div>

现在，当我尝试点击部分表单中的添加选项链接时，它不会显示。网址以

结尾

 http://localhost:3000/questions/new#

Answer 1

您忘了在新的

中启动选择选项

class QuestionsController < ApplicationController
  def new
    @question = Question.new
    @question.choice_options.build
  end
end

嵌套表格没有出现

1 个答案: