Question

我一直在努力争取在过去的几个小时内完成这项工作，但我出于某种原因无法做到这一点。我几乎完全按照github存储库链接上的说明执行了这些步骤。

我使用以下所有步骤创建了一个新应用程序：

# rails new demo_app
# cd demo_app/
+++ added gem 'cocoon' to the Gemfile
+++ added //= require cocoon to the application.js file
# rails g scaffold Project name:string description:string
# rails g model Task description:string done:boolean project:belongs_to
+++ added has_many :tasks to the Project model
+++ added :_destroy to the permit in my projects_controller.rb file
# bundle install

这是我的views / projects / _form.html.erb文件：

<%= form_for(@project) do |f| %>
  <% if @project.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@project.errors.count, "error") %> prohibited this project from being saved:</h2>

      <ul>
      <% @project.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :name %><br>
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :description %><br>
    <%= f.text_field :description %>
  </div>
  <%= f.fields_for :tasks do |task| %>
    <%= render 'task_fields', :f => task %>
    <%= link_to_add_association 'Add task', f, :tasks, class: "links" %>
  <% end %>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

现在我的观点/项目/ _task_fields.html.erb文件：

 <div id="nested-fields">
  <div class="field">
      <%= f.label :description %><br>
      <%= f.text_field :description %>
  </div>

  <div class="field">
      <%= f.label :description %><br>
      <%= f.text_field :description %>
  </div>
  <%= link_to_remove_association 'remove task', f %>
 </div>

这不完全是指南提到的吗？当我去创建一个新项目时，它只显示默认的名称标签，名称文本框，描述标签，描述文本框和＆＃34;创建项目链接＆＃34;。这是新项目表单的HTML输出：

<!DOCTYPE html>
<html>
<head>
  <title>DemoApp</title>
  <link data-turbolinks-track="true" href="/assets/projects.css?body=1" media="all" rel="stylesheet" />
<link data-turbolinks-track="true" href="/assets/scaffolds.css?body=1" media="all" rel="stylesheet" />
<link data-turbolinks-track="true" href="/assets/application.css?body=1" media="all" rel="stylesheet" />
  <script data-turbolinks-track="true" src="/assets/jquery.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/jquery_ujs.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/turbolinks.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/projects.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/cocoon.js?body=1"></script>
<script data-turbolinks-track="true" src="/assets/application.js?body=1"></script>
  <meta content="authenticity_token" name="csrf-param" />
<meta content="uIpLnix47UNaBONCR+0SV/uz1uiulU6BHqKe5qENzHQ=" name="csrf-token" />
</head>
<body>

<h1>New project</h1>

<form accept-charset="UTF-8" action="/projects" class="new_project" id="new_project" method="post"><div style="display:none"><input name="utf8" type="hidden" value="&#x2713;" /><input name="authenticity_token" type="hidden" value="uIpLnix47UNaBONCR+0SV/uz1uiulU6BHqKe5qENzHQ=" /></div>

  <div class="field">
    <label for="project_name">Name</label><br>
    <input id="project_name" name="project[name]" type="text" />
  </div>
  <div class="field">
    <label for="project_description">Description</label><br>
    <input id="project_description" name="project[description]" type="text" />
  </div>
    <div class="actions">
    <input name="commit" type="submit" value="Create Project" />
  </div>
</form>

<a href="/projects">Back</a>


</body>
</html>

有人可以帮助我吗？看起来我正在做指南中提到的所有事情，而且我没有从中获得任何东西。

Answer 1

link_to_add_association应该位于fields_for标记之外，其中的任何内容都将为每个添加的任务进行复制，您通常只需要在最后添加一个链接，也没有任何显示，因为没有任务被实例化，为了实例化一个，你可以单击link_to_add_association或者在项目表单创建时实例化它们，这可以通过项目控制器new动作来完成

#projects_controller.rb
def new
    @project = Project.new 
    @projet.tasks.build
end

您还可以通过执行某些循环（例如

）在表单创建上实例化多个任务

3.times do
  @project.tasks.build
end

无法在Ruby on Rails 4上使用茧

1 个答案: