[fw-general] Zend_Validate_NotEmpty and setRequired()

[Jan Brucek]

Hi,

I am currently having a problem with validating Zend_Form. Everything 
works great except when I try to add a NotEmpty validator to a field 
which is required.

$username = new Zend_Form_Element_Text('username');
$username->setLabel('Username')
         ->setRequired(true);

behaves as expected. Now I needed to change the message returned by the 
validator:

$valNotEmpty = new Zend_Validate_NotEmpty();
$valNotEmpty->setMessage("Message or whatever");

$username = new Zend_Form_Element_Text('username');
$username->setLabel('Username')
         ->setRequired(true)
         ->addValidator($valNotEmpty);

This returns exception 'Validator instance already exists for validator 
"NotEmpty"' no matter whether I set it before or after the setRequired() 
call.

Tried on 1.7.0 and 1.7.4. Any ideas on what is wrong?

Thanks

Jan Brucek