Prevent creation of new MANAGED entity instance by reloading REMOVED entity from database #11428
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According to #11208, you should target 2.x rightaway |
…ted. If the entity gets reloaded from database before the deletions are executed UnitOfWork needs to be able to return the original instance in REMOVED state.
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@greg0ire I've overlooked that, thanks. PR is now rebased and targets 2.19.x. |
greg0ire
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Apr 26, 2024
SenseException
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Thanks @xificurk ! |
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Fixes #6123, #9463
Replaces: #6126
Current behavior:
EntityManager::remove()called with MANAGED entity schedules the entity for deletion at a later time, but immediately removes it from identity map.The immediate removal from identity map is problematic. Until the changes are flushed, the entity may get loaded again from database - either directly as part of a query result, or indirectly through a reference from another entity. This leads to the creation of a new entity (proxy) instance that is then added to identity map, i.e. the
UnitOfWorkwill have both - MANAGED entity instance in identity map, and REMOVED entity scheduled for deletion.This leads to all sorts of unexpected behaviors, e.g.:
===entity comparisonspersistbehavior depending on which of the instances is passed (including indirect throughcascade: persist)Proposed fix: Postpone the removal from identity map to the time when the scheduled deletes are executed.
This change caused failure of
UnitOfWorkTest::testRemovedAndRePersistedEntitiesAreInTheIdentityMapAndAreNotGarbageCollected(), which directly asserted the problematic immediate removal from identity map. From the original PR #1338, it seems this is rather an unintended by-product than actually desired behavior. The test was introduced to ensure that REMOVED entity can become MANAGED again (and unscheduled from deletion) by re-persisting it. This functionality does not require the immediate removal from identity map. In fact, the immediate removal from identity map may break it as demonstrated inGH6123Test::testRemovedEntityCanBePersistedAgain().Although the PR targets 3.1.x branch, it would be definitely a good candidate for backporting.(changed to target 2.19.x)