Rails 3.0.3入门指南代码不会显示标记字段的field_with_errors div

我读取并复制/粘贴整个Ruby on Rails 3入门指南博客示例应用程序。我有一个正在运行的博客应用程序。我添加了一些验证代码到Post模型如下：Rails 3.0.3入门指南代码不会显示标记字段的field_with_errors div

class Post < ActiveRecord::Base 
    validates :name, :length => { :maximum => 64 } 

    validates :title, :presence => true, 
      :length => { :minimum => 5 } 

    validates :content, :presence => true, 
      :length => { :minimum => 5 } 

    validates :tags, :presence => true, 
      :length => { :minimum => 1 } 

    has_many :comments, :dependent => :destroy 
    has_many :tags 

    accepts_nested_attributes_for :tags, :allow_destroy => :true, 
      :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } } 
end

当我试图提交一个空的形式来测试验证代码我得到预期的错误，但它不显示<div class="field_with_errors"> DIV的标签领域。

生成的HTML：

<!DOCTYPE html> 
<html> 
<head> 
    <title>Rails Blog</title> 
    <link href="/stylesheets/scaffold.css?1292045851" media="screen" rel="stylesheet" type="text/css" /> 
    <script src="/javascripts/prototype.js?1292044228" type="text/javascript"></script> 
    <script src="/javascripts/effects.js?1292044228" type="text/javascript"></script> 
    <script src="/javascripts/dragdrop.js?1292044228" type="text/javascript"></script> 
    <script src="/javascripts/controls.js?1292044228" type="text/javascript"></script> 

    <script src="/javascripts/rails.js?1292044229" type="text/javascript"></script> 
    <script src="/javascripts/application.js?1292044228" type="text/javascript"></script> 
    <meta name="csrf-param" content="authenticity_token"/> 
    <meta name="csrf-token" content="FYDsbSpjAry7CQrVbdgdozsOJ66w4f4b8nVQ+towSYg="/> 
</head> 
<body> 

<h1>New post</h1> 

<form accept-charset="UTF-8" action="/posts" class="new_post" id="new_post" method="post"><div style="margin:0;padding:0;display:inline"><input name="utf8" type="hidden" value="&#x2713;" /><input name="authenticity_token" type="hidden" value="FYDsbSpjAry7CQrVbdgdozsOJ66w4f4b8nVQ+towSYg=" /></div> 
    <div id="errorExplanation"> 
    <h2>6 errors prohibited this post from being saved:</h2> 

    <ul> 
     <li>Title can't be blank</li> 
     <li>Title is too short (minimum is 5 characters)</li> 
     <li>Content can't be blank</li> 
     <li>Content is too short (minimum is 5 characters)</li> 
     <li>Tags can't be blank</li> 

     <li>Tags is too short (minimum is 1 characters)</li> 
    </ul> 
    </div> 

    <div class="field"> 
    <label for="post_name">Name</label><br /> 
    <input id="post_name" name="post[name]" size="30" type="text" value="" /> 
    </div> 
    <div class="field"> 

    <div class="field_with_errors"><label for="post_title">Title</label></div><br /> 
    <div class="field_with_errors"><input id="post_title" name="post[title]" size="30" type="text" value="" /></div> 
    </div> 
    <div class="field"> 
    <div class="field_with_errors"><label for="post_content">Content</label></div><br /> 
    <div class="field_with_errors"><textarea cols="40" id="post_content" name="post[content]" rows="20"></textarea></div> 
    </div> 

    <h2>Tags</h2> 

    <div class="field"> 
    <label for="post_tags_attributes_0_name">Tag:</label> 
    <input id="post_tags_attributes_0_name" name="post[tags_attributes][0][name]" size="30" type="text" /> 
    </div> 

    <div class="actions"> 
    <input id="post_submit" name="commit" type="submit" value="Create Post" /> 

    </div> 
</form> 

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


</body> 
</html>

什么可能导致的<div class="field_with_errors">没有？它与标签表单在部分中有什么关系？感谢您阅读我的第一篇文章。

帖/ _form.html.erb：

<% @post.tags.build %> 
<%= form_for(@post) do |post_form| %> 
    <% if @post.errors.any? %> 
    <div id="errorExplanation"> 
    <h2><%= pluralize(@post.errors.count, "error") %> prohibited this post from being saved:</h2> 
    <ul> 
    <% @post.errors.full_messages.each do |msg| %> 
     <li><%= msg %></li> 
    <% end %> 
    </ul> 
    </div> 
    <% end %> 

    <div class="field"> 
    <%= post_form.label :name %><br /> 
    <%= post_form.text_field :name %> 
    </div> 
    <div class="field"> 
    <%= post_form.label :title %><br /> 
    <%= post_form.text_field :title %> 
    </div> 
    <div class="field"> 
    <%= post_form.label :content %><br /> 
    <%= post_form.text_area :content %> 
    </div> 
    <h2>Tags</h2> 
    <%= render :partial => 'tags/form', 
      :locals => {:form => post_form} %> 
    <div class="actions"> 
    <%= post_form.submit %> 
    </div> 
<% end %>

标签/ _form.html.erb：

<%= form.fields_for :tags do |tag_form| %> 
    <div class="field"> 
    <%= tag_form.label :name, 'Tag:' %> 
    <%= tag_form.text_field :name %> 
    </div> 
    <% unless tag_form.object.nil? || tag_form.object.new_record? %> 
    <div class="field"> 
     <%= tag_form.label :_destroy, 'Remove:' %> 
     <%= tag_form.check_box :_destroy %> 
    </div> 
    <% end %> 
<% end %>

当空白表单提交的命令端子输出：

Started POST "/posts" for 192.168.11.28 at 2010-12-11 23:23:03 +0000 
    Processing by PostsController#create as HTML 
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"T2o6Tn8cfeJyVVcFMU91Zuk42BBs06uqyMIgfmy41SM=", "post"=>{"name"=>"", "title"=>"", "content"=>"", "tags_attributes"=>{"0"=>{"name"=>""}}}, "commit"=>"Create Post"} 
Rendered tags/_form.html.erb (45.5ms) 
Rendered posts/_form.html.erb (320.0ms) 
Rendered posts/new.html.erb within layouts/application (351.2ms) 
Completed 200 OK in 748ms (Views: 379.2ms | ActiveRecord: 0.0ms)

来源

2010-12-11 BasicObject

请问您可以发表您的表格部分红宝石代码。 – 2010-12-11 22:58:43

你是否真的得到了空白标签的验证错误，或者他们只是没有得到保存？ – 2010-12-11 23:17:52

当我尝试提交一个空白表单时，它表示“标签不能为空”和 “标签太短（最少为1个字符）”，并将命令行输出添加到上面的帖子中。 – BasicObject 2010-12-11 23:24:11

您在Post班级中加入了attr_accessible：

class Post < ActiveRecord::Base 
    .... 
    attr_accessible :tag_attributes 
    # or it could be the plural version :tags_attributes 
    .... 
end

来源

2010-12-12 09:46:45 Zabba

感谢您的回复。我试过'attr_accessible：name，：title，：content，：tags_attributes'和'attr_accessible：tags_attributes'。第一个允许我创建帖子，而另一个不创建帖子。如果我使用'tag_attributes'或'post_tags_attributes'，我会得到一个批量分配警告。令人遗憾的是attr_accessible：name：title：content：tags_attributes仍然无法解决field_with_errors div类的问题。 – BasicObject 2010-12-12 23:06:19

我不是很确定field_with_errors魔法是如何工作的，但它似乎需要一个标签或输入字段失败验证。所以如果你添加一个触发它的post_form.label :tags。但它不会出现在标签上的名称text_field（或标签），因为标签名称字段不是失败的验证。如果您想要，您可以在检查@post.errors[:tags].empty?后自行添加field_with_errors div。

来源

2010-12-16 17:40:28 eremite

我想我看到了一些事情，但我对他们中的任何一个都不积极。首先，如果#tags是关联而不是属性，我认为你不能直接使用validates：tags。这应该是validates_associated：tags（然后在标记模型中validates_presence_of：name）。

其次，不是：accept_nested_attributes_for的reject_if选项会在您提交空白表单时触发吗？如果发生这种情况，您的Tag对象将在呈现表单之前被删除。

来源

2010-12-17 06:19:19 bgates

Rails 3.0.3入门指南代码不会显示标记字段的field_with_errors div

回答

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