[fw-general] Zend_Validate_Db_NoRecordExists

[flow]

Hi,

I want to use Zend_Validate_Db_NoRecordExists to check if a username already
exists.
Actually I set the validator in the edit and in the new Action of the
userController.

Validator in newAction()

        // Set validator
        $db_lookup_validator = new Zend_Validate_Db_NoRecordExists('user',
'username'); 
        $form->username->addValidator($db_lookup_validator);


Validator in editAction()

        // Set validator
        $db_lookup_validator = new Zend_Validate_Db_NoRecordExists('user',
'username', array('field' => 'id', 'value' => $id));
        $form->username->addValidator($db_lookup_validator);



I want to know if this is the correct way to do this?
Or is there a way to get the hole validation thing in the user form?

Thank you very much,
greets B.
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