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Symfony 6 >

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Doctrine, Symfony 6 & the Database >

CHAPTER

Persisting to the Database

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Challenge #1 of 1

Q: 

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?

a)

This will create a second row in the database.

b)

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

c)

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

d)

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

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