首先，没有一种方法（atm Django 1.9.7）可以 _ *_
>>> Topic.objects.annotate(
f=Case(
When(
record__user=johnny,
then=F('record__value')
),
output_field=IntegerField()
)
).order_by(
'id', 'name', 'f'
).distinct(
'id', 'name'
).values_list(
'name', 'f'
)
>>> [(u'A', 1), (u'B', None), (u'C', 3)]
>>> Topic.objects.annotate(f=Case(When(record__user=may, then=F('record__value')), output_field=IntegerField())).order_by('id', 'name', 'f').distinct('id', 'name').values_list('name', 'f')
>>> [(u'A', 4), (u'B', 5), (u'C', 6)]
>>> print Topic.objects.annotate(f=Case(When(record__user=johnny, then=F('record__value')), output_field=IntegerField())).order_by('id', 'name', 'f').distinct('id', 'name').values_list('name', 'f').query
>>> SELECT DISTINCT ON ("payments_topic"."id", "payments_topic"."name") "payments_topic"."name", CASE WHEN "payments_record"."user_id" = 1 THEN "payments_record"."value" ELSE NULL END AS "f" FROM "payments_topic" LEFT OUTER JOIN "payments_record" ON ("payments_topic"."id" = "payments_record"."topic_id") ORDER BY "payments_topic"."id" ASC, "payments_topic"."name" ASC, "f" ASC
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