validation in model

Hi all,

Is it possible to have model validation only be called when there is an add
action and not edit for example ?

I have added unique name validation but now with the edit of a record it
still gives a validation error as that name of that record already exists.

My code as follows:

var $validate = array(
'question' => array(
'Question already exists, please enter a unique
question' => array(
'rule' => array(
'isUnique',
'question'
)
),
'This field cannot be left blank' =>
VALID_NOT_EMPTY
),

function isUnique($field, $value) {

$fields[$this->name.'.'.$value] = $field[$value];
$this->recursive = -1;

if ($this->hasAny($fields)) {
$this->invalidate('unique_'.$field);
return false;
} else {

return true;
}
}

thanks in advance.

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