Django批注无法使用order_by

我想在（'-end_date'）之前获得MyModel order_的最后100条记录，并对不同的赢家类型进行总和注释

MyModel.objects.all()[:100].order_by('-end_game_time').values('winner').annotate(total=Count('winner'))

结果查询如下，我没有预期的组

<QuerySet [{'winner': 3, 'total': 1}, {'winner': 15, 'total': 1}, 'total': 1}, {'winner': 3, 'total': 1}, {'winner': 5, 'total': 1}, {'winner': 15, 'total': 1}, {'winner': 5, 'total': 1}, {'winner': 3, 'total': 1}, '...(remaining elements truncated)...']>

但是当我没有订单时，结果正如我所预料的

MyModel.objects.all()[:100].values('winner').annotate(total=Count('winner'))
Out[52]: <QuerySet [{'winner': 5, 'total': 43}, {'winner': 1, 'total': 2}, {'winner': 15, 'total': 51}, {'winner': 2, 'total': 42}, {'winner': 3, 'total': 43}]>

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据我所知，不可能在单个查询中实现您想要做的事情，您想要在SQL中实现的是：

SELECT "game_mymodel"."winner", COUNT("game_mymodel"."winner") AS "total" FROM "game_mymodel" GROUP BY "game_mymodel"."winner" ORDER BY "game_mymodel"."end_game_time" DESC LIMIT 100

这不是一个有效的sql查询，因此您需要有一个子查询来选择100个元素，然后对它们应用聚合

首先构建子查询：

top_100_games = MyModel.objects.order_by('-end_game_time')[:100].only('id').all()

然后在主查询中使用它：

MyModel.objects.filter(id__in=top_100_games).values('winner').annotate(total=Count('winner'))

top_100_games = MyModel.objects.order_by('-end_game_time')[:100].only('id').all()

MyModel.objects.filter(id__in=top_100_games).values('winner').annotate(total=Count('winner'))