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分享关于mongodb 分组的问题 Invalid reference 'userId'!
Criteria criteria = Criteria.where("businessCode").is(businessCode).and("optime").regex(month);
Aggregation aggregation = Aggregation.newAggregation(Aggregation.project("deviceType", "num"),
Aggregation.match(criteria), Aggregation.group("userId").count().
as("num"));
根据userid进行分组，然后报错
Aggregation aggregation = Aggregation.newAggregation(Aggregation.project("deviceType", "num"),
Aggregation.match(criteria), Aggregation.group("userId").count().
as("num"));
根据userid进行分组，然后报错
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wuhuan0418 2018-07-03
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已解决，Aggregation.project("deviceType", "num")需要增加userId字段，被自己蠢哭
