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Type: Task
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Resolution: Done
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Affects Version/s: None
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Component/s: None
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It really fixes https://github.com/mongoid/mongoid/issues/2701
The problem is that there seems to be no way for a has_one setter to know, whether assigned object is the same without actually getting the object from DB; so I reversed your path and solved the problem in belongs_to setter. I'm not sure that I did it the best way, but at least I didn't break any existing specs and added one spec to cover the bug.