You could just add the hidden field to the form class like:

$this->widgetSchema['secret_hidden_field'] = new
sfWidgetFormInputHidden();

don't forget to add the validator.  If I remember correctly there is a
call to renderHiddenFields() already in _form.php.  You should only
have
to change the form, there isn't a need to change the generator.yml
file or the _form.php file AFAIK.

HTH,
Casey

On May 3, 12:48 pm, Augusto Flavio <[email protected]> wrote:
> Hi,
>
> What is the best way to add a hidden field in a form in the backend ? Is
> there some way to do it using the generator.yml or need i change the
> _form.php template?
>
> Thanks
>
> Augusto Morais
>
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