Mongodb java查找文档并过滤数组字段(删除不符合条件的数组数据)
我试图请求一个集合,但无法过滤嵌入的数组。我想获取集合中匹配{“players.nick”:nick}的所有文档,并过滤“players”数组,只获取搜索到的玩家
以下是初步文件:
{"_id":2000,"type":3,"prizepool":6520.5,"name":"XXX","start":1515701700,"end":1515719580,"buyin":2.25,"rake":0.5,"prize":0,"bounty":2.25,"players":[{"nick":"player1","rank":1,"cash":660.85,"kill":468.64,"ticket":0,"reentry":0},{"nick":"player2","rank":2,"cash":430.35,"kill":101.31,"ticket":0,"reentry":0},{"nick":"player3","rank":3,"cash":312.98,"kill":72.26,"ticket":0,"reentry":0},{"nick":"player4","rank":4,"cash":237.99,"kill":27.15,"ticket":0,"reentry":1}]}
请求之后,我想检索:
{"_id":2000,"type":3,"prizepool":6520.5,"name":"XXX","start":1515701700,"end":1515719580,"buyin":2.25,"rake":0.5,"prize":0,"bounty":2.25,"players":[{"nick":"player1","rank":1,"cash":660.85,"kill":468.64,"ticket":0,"reentry":0}}
有人知道如何用java的方式做到这一点吗
谢谢
# 1 楼答案
您可以在java中使用下面的聚合管道
对于单个匹配,可以使用
$elemMatch
投影适用于单人房和单人房;多重匹配