Why does flush($some) flush all changes?

Question

symfony

Hello, today I encountered the following behavior in symfony:

$remove = $this->getEm()->getRepository('MainBundle:Something')->findOneBy([],['id'=>'ASC']);
$this->getEm()->remove($remove);

$city = new City();
$city->setName(date('U'));
$this->getEm()->persist($city);
$this->getEm()->flush($city);

As a result, remove is removed, although only the change to the city entity is expected to be saved. Why is this happening?

Answer 1

Vitaly Sorokin , Answers here:
https://github.com/doctrine/doctrine2/blob/master/...
https://github.com/doctrine/doctrine2/blob/master/...

/**
 * Only flushes the given entity according to a ruleset that keeps the UoW consistent.
 *
 * 1. All entities scheduled for insertion, (orphan) removals and changes in collections are processed as well!
 * 2. Read Only entities are skipped.
 * 3. Proxies are skipped.
 * 4. Only if entity is properly managed.
 *
 * @param object $entity
 *
 * @return void
 *
 * @throws \InvalidArgumentException
 */
private function computeSingleEntityChangeSet($entity)