Hi my code now looks like this:
public function sortGenres(array $genres)
{
$position = 1;
// Update all genres with new position
foreach (array_keys($genres) as $genreId)
{
$genre = $this->getRepository()->findOneById($genreId);
if ($genre->getRanking() !== $position)
{
$genre->setRanking($position);
$this->getObjectManager()->persist($genre);
}
++$position;
}
$this->getObjectManager()->flush();
}
So only two objects need to be updated because they changed position.
It updates the first with the new position, but somehow the second is not
updated even though while debugging I see the position changed,
In the database however it remains the old position.
I even tried it without the persist like Jasper mentioned. I checked the
code $genre->setRanking($position); is only called twice and correctly, but
the second time is not stored in the database.
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