Rails Tutorial Chap 7 memo.

app_views_shared_error_messages.html.erb.diff

# Listing 7.24. A partial for displaying form submission error messages.
- <% if @user.errors.any? %>
  <div id="error_explanation">
    <div class="alert alert-error">
      The form contains <%= pluralize(@user.errors.count, "error") %>.
    </div>
    <ul>
    <% @user.errors.full_messages.each do |msg| %>
      <li>* <%= msg %></li>
    <% end %>
    </ul>
  </div>
- <% end %>

app_views_users_new.html.erb.diff

# Listing 7.23. Code to display error messages on the signup form. 
<% provide(:title, 'Sign up') %>
<h1>Sign up</h1>

<div class="row">
  <div class="span6 offset3">
    <%= form_for(@user) do |f| %>
-      <%= render 'shared/error_messages' %>
+      <%= render 'shared/error_messages' if @user.errors.any? %>
      .
      .
      .
    <% end %>
  </div>
</div>