Challenge #1 of 1

Q: 

Let's get tricky! Check out the following code:

$product = new Product();
$product->setName('Shuttle Lego Set!');

$entityManager->flush();
$product->setPrice(25);
$entityManager->flush();
$entityManager->persist($product);
$entityManager->flush();
$entityManager->flush();
$product->setPrice(30);
$entityManager->flush();

How many queries did Doctrine make to the database?