Django使用注释设置连接条件

Question

我有以下表达式：

Product.objects.annotate(views_total=models.Sum('stats__views'))

正确连接Product和Stats表并聚合每个product.id的stats.views字段：

SELECT 
    "product"."id", "product"."name", SUM("stats"."views") AS "views_total" 
FROM 
    "product" LEFT OUTER JOIN "stats" ON ("product"."id" = "stats"."product_id") 
GROUP BY "product"."id";

我正在尝试弄清楚如何在已加入的统计信息表中添加条件，该条件对应于此类查询：

SELECT 
    "product"."id", "product"."name", SUM("stats"."views") AS "views_total" 
FROM 
    "product" LEFT OUTER JOIN "stats" ON ("product"."id" = "stats"."product_id") AND ("stats"."condition" > 100)
GROUP BY "product"."id";

我试过了：

Product.objects.annotate(views_total=models.Sum('stats__views')).filter(stats__condition__gt = 100)

但是这导致内部连接不能产生所需的结果：

SELECT 
    "product"."id", "product"."name", SUM("stats"."views") AS "views_total" 
FROM 
    "product" LEFT OUTER JOIN "stats" ON ("product"."id" = "stats"."product_id") 
INNER JOIN 
    "stats" T3 ON ("product"."id" = T3."product_id") 
WHERE (T3."condition" > 100) 
GROUP BY "product"."id";