If the object is changed during the pre-update callback, this causes the previous changes to be discarded.
Steps to reproduce:
- Create entity with pre-update lifecycle callback
- Change property A,
- Call flush.
- Change property B in pre-update callback
Result is that changes to property A are discarded.
The reason for that is that at the end of Doctrine\ORM\UnitOfWork::_computeEntityChanges() these two statements appear:
However at the end of Doctrine\ORM\UnitOfWork::computeSingleEntityChangeSet(), which is called after the pre-update callbacks are called, the same thing happens:
Because the original data is recorded as equal to the state of the object after the first call to _computeEntityChanges(), the call to computeSingleEntityChangeSet() does not detect the original set of changes, it only detects the changes made in the pre-update hooks. But at the same time, both methods completely overwrite the changeset buffer for the entity rather than merge it. The result is that the first changeset is completely discarded.