Mvc\Collection::getMessages

$robot = new Robots();
 $robot->type = 'mechanical';
 $robot->name = 'Astro Boy';
 $robot->year = 1952;
 if ($robot->save() == false) {
echo "Umh, We can't store robots right now ";
foreach ($robot->getMessages() as message) {
    echo message;
}
} else {
echo "Great, a new robot was saved successfully!";
}