Question

已经按照视频教程进行了一遍又一遍的搜索，但是没有得到它。非常感谢帮助。

我的主要问题是link_to_add_association无效，我不断收到模板错误。

“应用程序中的ActionView :: MissingTemplate #new”

它说：缺少部分application / _question_fields，application / _question_fields with {：locale =＆gt; [：en]，：formats =＆gt; [：html] ,: variants =＆gt; []，：handlers =＆gt; [：raw，：erb ，：html，：builder，：ruby，：coffee，：jbuilder]}。搜索范围： *“/ Users / AndyAir / projects / friends-app / app / views” *“/Users/AndyAir/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/devise-4.2.1/app/views”

模型

class Application < ApplicationRecord
 belongs_to :user

 has_many :questions

 accepts_nested_attributes_for :questions, reject_if: :all_blank, allow_destroy: true

 validates :name, :description, presence: true
end

控制器

class ApplicationsController < ApplicationController
 before_action :find_application, only: [:show, :edit, :update, :destroy]
 before_action :authenticate_user!

 def index
    @applications = Application.all.order("created_at DESC").limit(3)
 end

 def new    
  @application = Application.new
  @application.questions.build
 end

 def create
    @application = Application.new(application_params)

    if @application.save
        redirect_to @application
    else
        render 'new'
    end
 end

 def show
 end

 def edit
 end

 def update
    if @application.update(application_params)
        redirect_to @application
    else
        render 'edit'
    end
 end


 def destroy
    @application.destroy
    redirect_to root_path
 end

 private

 def find_application
    @application = Application.find(params[:id])
 end

 def application_params
    params.require(:application).permit(:name, :description, questions_attributes: [:id, :name, :_destroy])
 end

 def after_sign_out_path_for(resource_or_scope)
  redirect_to root_path
 end
end

视图/应用/新

<%= form_for @application do |f| %>
    <% if @application.errors.any? %>
      <div id="errors">
        <p><%= @application.errors.count %> Prevented this application from saving</p>
        <ul>
          <% @application.errors.full_messages.each do |msg| %>
            <li><%= msg %></li>
          <% end %>
        </ul>
      </div>
    <% end %>
    <div class="field">
        <%= f.label :title %><br>
        <%= f.text_field :name, placeholder: "Name of Your Friend Test", class: "form-control" %><br>
        <%= f.label :description %><br>
        <%= f.text_field :description, placeholder: "Write a witty tagline for your test.", class: "form-control" %><br>
    </div>
    <h3>Questions</h3>
        <%= f.fields_for :questions do |question| %>
            <div id="questions">
                <div class="field">
                <%= render 'questions_fields', f: question %>
             <div class="links">
                <%= link_to_add_association 'Add Question', f, :questions %>
               </div>
              </div>
            </div>
        <% end %>
    <br>
    <div class="form-actions">
        <%= f.button :submit %>
    </div>
<% end %>

视图/应用/ _questions_fields.html.erb

<div class="nested-fields">
  <%= f.text_field :question %>
  <%= link_to_remove_association "remove task", f %>
</div>

Answer 1

请尝试从fields_for中取出link_to_add_association。由于还没有问题，link_to_add_association永远不会显示。

<%= f.fields_for :questions do |question| %>
    <div id="questions">
        <div class="field">
            <%= render 'questions_fields', f: question %>
        </div>
    </div>
<% end %>
<div class="links">
    <%= link_to_add_association 'Add Question', f, :questions %>
</div>

Answer 2

您的视图名称不正确，因为cocoon会自动推断。当你有_question_fields时，它正在寻找_questions_fields（单数）。

要么重命名部分（它只包含一个问题，所以它似乎更符合逻辑），但你也可以overrule the default partial name如下：

<%= link_to_add_association 'Add Question', f, :questions, partial: 'questions_fields' %>

Cocoon link_to_add_association无效

2 个答案: