Zkuste to místo toho
$this->coordinates = new CDbExpression("GeomFromText(:point)",
array(':point'=>'POINT('.$coords['lat'].' '.$coords['lng'].')'));
Zkuste to místo toho
$this->coordinates = new CDbExpression("GeomFromText(:point)",
array(':point'=>'POINT('.$coords['lat'].' '.$coords['lng'].')'));