The code I showed before does work, and cake already has a unique
validation so why code it your self. Try his:

var $validate = array(
        'field1' => array(
                'unique' => array(
                        'rule' => 'isUnique',
                        'required' => true,
                        'message' => 'Duplicate entry in Field1'
                )
        ),
        'field2' => array(
                'unique' => array(
                        'rule' => 'isUnique',
                        'required' => true,
                        'message' => 'Duplicate entry in Field2'
                )
        )
);

Again, you should take a look to:
http://book.cakephp.org/view/133/Multiple-Rules-per-Field
http://book.cakephp.org/view/134/Core-Validation-Rules
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