intermediateEntity Lifecycle — Persist, Merge, Detach, Remove & Proxies
Why is it a common mistake to keep using the object you passed into merge()?
merge() does NOT make the object you passed in managed — it copies that object's state onto a different, managed entity (looked up or loaded by ID) and returns THAT object. The object you originally passed in remains detached. Continuing to use the original reference, expecting it to now be managed and dirty-checked, is a very common real bug.
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