_form.html.erb

<%= form_for @account do |f| %>
  <%= render "shared/form_errors", :object => @account %>
 
  # ... Other form view code here ...</span>

_form_errors.html.erb

<% if object.errors.any? %>
<div id="error_explanation">
  <h2>Please fix the following <%= pluralize(object.errors.count, "error") %>:</h2>
 
  <ul>
    <% object.errors.full_messages.each do |msg| %>
    <li><%= msg %></li>
    <% end %>
  </ul>
</div>
<% end %>

_form_old.html.erb

<% if @model.errors.any? %>
<div id="error_explanation">
  <h2><%= pluralize(@session.errors.count, "error") %> with form:</h2>
 
  <ul>
   <% @session.errors.full_messages.each do |msg| %>
     <li><%= msg %></li>
   <% end %>
  </ul>
</div>
<% end %>