经过一天的苦苦挣扎，我终于解决了。尽管它不会从上方产生相同的查询，并且效率不高（因为它在查询事件中选择了所有喜欢的事物），但似乎这是在ORM中执行此操作的唯一好方法：
from django.db.models import Case, When, F
Event.objects.filter( \
Q(business__manager=person) | \
Q(likes__person=person)) \
.order_by( \
Case( \
When(likes__person=person, then=F('likes__date')), \
default=F('when')) \
.desc())
这是它产生的sql：
SELECT event.*
FROM event
INNER JOIN
business
ON (event.business_id = business.id)
LEFT OUTER JOIN
'like'
ON (event.id = object_id AND content_type_id = 17)
WHERE (business.manager_id = 2 OR 'like'.person_id = 2)
ORDER BY CASE
WHEN 'like'.person_id = 2 THEN 'like'.date
ELSE event.'when'
END DESC;
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