>>> a = Tag.objects.filter(pk=1)
>>> a._result_cache
>>> a
<QuerySet [<Tag: Test>]>
>>> a._result_cache
>>> for b in a:
...     pass
...
>>> a._result_cache
[<Tag: Test>]
>>>
>>> from django.utils.functional import cached_property
>>> class X:
...     @cached_property
...     def tags(self):
...         return Tag.objects.filter(pk=1)
... 
>>> x = X()
>>> x.tags._result_cache
>>> x.tags
<QuerySet [<Tag: Test>]>
>>> x.tags._result_cache
>>> for y in x.tags:
...     pass
... 
>>> x.tags._result_cache
[<Tag: Test>]