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def prefetched_related(instance, name, default=None):
Attempts to find and return prefetched data on a model.
values, prefetched = prefetched_related(instance, 'name')
values : A list of prefetched values for the field.
prefetched : True if the requested field was prefetched on the instance.
if hasattr(instance, '_prefetched_objects_cache'):
# Use the prefetched values only if the requested field was prefetched.
if name in instance._prefetched_objects_cache:
return instance._prefetched_objects_cache[name], True
return default, False
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