Rails 3.0 中的 f.error_messages [英] f.error_messages in Rails 3.0

问题描述

Rails 3.0 已弃用 f.error_messages，现在需要插件才能正常工作 - 但是我想学习如何以(新的)原生方式显示错误消息.我正在关注 入门指南，它在实现评论表单时使用了已弃用的方法.例如:

添加评论:
<%= form_for([@post, @post.comments.build]) 做 |f|％＞<%= f.error_messages %><div class="field"><% f.label :commenter %><br/><%= f.text_field :commenter %>

<div class="field"><%= f.label :body %><br/><%= f.text_area :body %>

<div class="actions"><%= f.submit %>

<%结束%>

这是正确的方法(由脚手架生成):

<%= form_for(@post) do |f|％＞<% 如果@post.errors.any?％＞<div id="error_explanation"><h2><%=pluralize(@post.errors.count, "error") %>禁止保存此帖子:</h2><ul><% @post.errors.full_messages.each 做 |msg|％＞<li><%=msg%></li><%结束%>

<%结束%>...

我知道我在后一个例子中使用了 @post 变量，但是我在前一个例子中引用了什么变量来获取创建评论的错误消息?

解决方案

我刚刚查看了 docrails github 问题，他们决定删除 f.error_messages 而不是解释如何对评论进行验证.

Rails 3.0 deprecated f.error_messages and now requires a plugin to work correctly - I however want to learn how to display error messages the (new) native way. I am following the getting started guide, which uses the deprecated method when implementing the comments form. For example:

<h2>Add a comment:</h2>
<%= form_for([@post, @post.comments.build]) do |f| %>
  <%= f.error_messages %>
<div class="field">
  <% f.label :commenter  %><br />
  <%= f.text_field :commenter  %>
</div>
<div class="field">
  <%= f.label :body %><br />
  <%= f.text_area :body %>
</div>
<div class="actions">
  <%= f.submit %>
</div>
<% end %>

Here is the correct way to do it (as generated by the scaffold):

<%= form_for(@post) do |f| %>
  <% if @post.errors.any? %>
    <div id="error_explanation">
      <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 %>
 . . . 

I understand that I use the @post variable in the latter example, but what variable do I reference in the former to get the error messages for comment creation?

解决方案

I just looked into the docrails github issues, and they've decided to remove f.error_messages instead of explaining how to do validation for comments.

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