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Here's a tricky question. Check out this code where we persist and flush twice!

$mix = new VinylMix();
// setting data

$entityManager->persist($mix);
$entityManager->flush();

// do it again!
$entityManager->persist($mix);
$entityManager->flush();

What do you think the second persist/flush will do?

This will create a second row in the database.

This will cause an error, as it will try to insert another row, but using the id assigned by the first insert.

This will create a second row in the database, though the second persist() isn't necessary (only the 2nd flush() is necessary).

Nothing! Doctrine will realize the $mix has already been saved.

Rewatch the video