There's lots of good info about how to customize the error message 
output here:

http://apidock.com/rails/ActionView/Helpers/ActiveRecordHelper/error_messages_for

Difei Zhao wrote:
> Hi all,
> 
>   I have a web form:
> 
> <% form_for @comment do |f| %>
>         <%= f.error_messages %>
>   <p>
>         <%= f.label :author %>
>   <%= f.text_field :author, :size => 20 %>  %>
>   </p>
>   <p>
>         <%= f.label :email %>
>   <%= f.text_field :email, :size => 20 %>
>   </p>
> <% end %>
> 
> When the validation fails, the labels will be wrapped into <div>, so
> labels and fields are in different lines, that is not what I want. If
> you have the agile web development book, please turn to p.151 (the
> source code is in p.146 and [1]), how did the author archived that?
> Thanks.
> 
> Difei
> 
> 1.
> http://media.pragprog.com/titles/rails2/code/depot_p/app/views/store/checkout.rhtml

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