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Do not reassign Collections, use $collection->clear() (consistency issue)

Problem:

Due to bug in UnitOfWork change-set calculation that was reported almost a year ago (doctrine/orm#9301), it's dangerous to reassign collections in some special cases. Typically, the problem is triggered by calling $entityManager->flush() multiple times -> the first call clears the change-set, the second call then does not detect the need to delete old collection data.

Solutions:

  • Always use $collection->clear() instead of reassigning the collection (src/CollectionReassignment/Solution/Article.php)