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DDC-763 - Add note about handling merges of multiple entities which share subgraphs of objects

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Benjamin Eberlei 2010-11-10 23:49:07 +01:00
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6
manual/en/working-with-objects.txt
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@ -308,6 +308,12 @@ and `remove`. The most common scenario for the `merge` operation is to reattach
entities to an EntityManager that come from some cache (and are therefore detached)
and you want to modify and persist such an entity.
> **CAUTION**
> If you need to perform multiple merges of entities that share certain subparts
> of their object-graphs and cascade merge, then you have to call `EntityManager#clear()` between the
> successive calls to `EntityManager#merge()`. Otherwise you might end up with
> multiple copies of the "same" object in the database, however with different ids.
> **NOTE**
> If you load some detached entities from a cache and you do not need to persist or
> delete them or otherwise make use of them without the need for persistence services