Mongodb aggregatin查询 [英] Mongodb aggregatin query
本文介绍了Mongodb aggregatin查询的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
大家好，我对mongodb很新，遇到问题。
i有一个如下所示的收藏品
hi all, I am very new to mongodb and got stuck to a problem.
i have a collection as shown below
{
"_id" : ObjectId("5881b26f2694efd0ef17eb8b"),
"firstName" : "sumit",
"lastName" : "vishwakarma",
"likes" : [
{
"id" : 1,
"value" : "java"
},
{
"id" : 2,
"value" : "c++"
}
]
}
{
"_id" : ObjectId("5881baf82694efd0ef17eb8c"),
"firstName" : "test",
"lastName" : "test",
"likes" : [
{
"id" : 3,
"value" : "java"
},
{
"id" : 2,
"value" : "c++"
}
]
}
i希望编写一个查询，为成员提供并搜索喜欢的特定ID，如果该ID存在则应该其他是假的。
以下是输出应该如何看待
搜索id：3 in likes
i want to write a query which give members and search for a particular id in likes and if that id is present then it should be true else false.
below is how the output should look
search for id:3 in likes
{
"_id" : ObjectId("5881b26f2694efd0ef17eb8b"),
"firstName" : "sumit",
"lastName" : "vishwakarma",
"likes" : [
{
"id" : 1,
"value" : "java"
},
{
"id" : 2,
"value" : "c++"
}
] ,
"isLiked":false
}
{
"_id" : ObjectId("5881baf82694efd0ef17eb8c"),
"firstName" : "test",
"lastName" : "test",
"likes" : [
{
"id" : 3,
"value" : "java"
},
{
"id" : 2,
"value" : "c++"
}
],
"isLiked":true
}
任何提示都将不胜感激
我的尝试：
i尝试使用聚合编写查询，$ elemMatch但无法获得所需的输出
any hint will be appreciated
What I have tried:
i have tried writing query using aggregation, $elemMatch but couldn't get the desired output
推荐答案
elemMatch但是无法获得所需的输出
elemMatch but couldn't get the desired output
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