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POf.error_messages in Rails 3.0
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  1. POf.error_messages in Rails 3.0
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    copied!<p>Rails 3.0 deprecated <code>f.error_messages</code> 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 <a href="http://edgeguides.rubyonrails.org/getting_started.html" rel="noreferrer">getting started guide</a>, which uses the deprecated method when implementing the comments form. For example:</p> <pre><code>&lt;h2&gt;Add a comment:&lt;/h2&gt; &lt;%= form_for([@post, @post.comments.build]) do |f| %&gt; &lt;%= f.error_messages %&gt; &lt;div class="field"&gt; &lt;% f.label :commenter %&gt;&lt;br /&gt; &lt;%= f.text_field :commenter %&gt; &lt;/div&gt; &lt;div class="field"&gt; &lt;%= f.label :body %&gt;&lt;br /&gt; &lt;%= f.text_area :body %&gt; &lt;/div&gt; &lt;div class="actions"&gt; &lt;%= f.submit %&gt; &lt;/div&gt; &lt;% end %&gt; </code></pre> <p>Here is the correct way to do it (as generated by the scaffold):</p> <pre><code>&lt;%= form_for(@post) do |f| %&gt; &lt;% if @post.errors.any? %&gt; &lt;div id="error_explanation"&gt; &lt;h2&gt;&lt;%= pluralize(@post.errors.count, "error") %&gt; prohibited this post from being saved:&lt;/h2&gt; &lt;ul&gt; &lt;% @post.errors.full_messages.each do |msg| %&gt; &lt;li&gt;&lt;%= msg %&gt;&lt;/li&gt; &lt;% end %&gt; &lt;/ul&gt; &lt;/div&gt; &lt;% end %&gt; . . . </code></pre> <p>I understand that I use the <code>@post</code> variable in the latter example, but what variable do I reference in the former to get the error messages for comment creation?</p>
 

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