how to give forms a class

[sasogeek]

if i have this in normal html coding...

<form class="form-1">

    ...

</form>

how do I make the same effect if i have

#controller

...

form = auth()

#view

...

{{form.custom.begin}}

...

{{form.custom.end}}

I know that to give a form descendant element, like input for example, a class, you can do

form = auth()

email = form.element('input', _name='email')

email['_class'] = 'field'

but what about the form element itself?

[Bruno Rocha]

form['_class'] = 'foo'

it should work

or even

form.elements('form')[0]['_class'] = 'foo'