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Saves in mongoengine are atomic, however, when saving a list it does it as a $set for the whole list. So you could have a race condition.
This is why the preferred way to append to a list is to do a $push eg:
modelObj.update(push__dataList=data)
👤Ross
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table_name.objects.filter(__id=1).update(push__fieldname={‘key’ : ‘value’,’key’ : ‘value’,}) if you want delete than pull
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