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Rails error message notifications
#place immediately under 'form_for' line
<% if @item.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@item.errors.count, "error") %> prohibited this item from being saved:</h2>
<ul>
<% @item.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
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