How to make nested queries in MongoDb that works like nested Sql select queries

Question

I want to make an efficient query in MongoDb to find all users who have their userids listed in a usergroup. Ideally I want to make this as a single request to Mongodb. What I w

Answer 1

If it can trigger to get you ans--

db.users.find({
    _id: {
        $in: db.logs.find({
            loggedbyuser: {
                $ne: ObjectId("569f9d093447ee781ca80b52")
            },
            logtype: "marketfetched",
            "logcreated": {
                $gt: new ISODate("2016-02-06T00:00:00.871Z")
            }
        }, {
            loggedbyuser: 1,
            _id: 0
        }).sort({
            'logcreated': -1
        }).map(function(like) {
            return like.loggedbyuser;
        })
    }
}).map(function(like) {
    return like.fullname;
});