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myinstance.rating contains method get_ratings()
– which returns queryset to calculate all votes related to object. You can easily extend it for retrive necessary information. For example:
# it's lazy object
rating = myinstance.rating.get_ratings()
# do additional query for db
if not rating.filter(user=user, ip_address=request.META['REMOTE_ADDR']).exists():
...
Source:stackexchange.com