collections - MongoDB - 如何从集合中查询嵌入文档

Question

大师 - 我陷入了一种情况，无法弄清楚如何从以下集合“users”中查询，它有 2 个嵌入文档“signup”和“事件”:

{
    "appid": 2,
    "userid": 404915,
    "signup": {
        "dt": "2010-12-28",
        "platform": 2 
    },
    "activity": {
        {
            "dt": "2010-12-28",
            "platform": 3,
            "login_count": 8,
            "game_completed": 13 
        },
        {
            "dt": "2010-12-30",
            "platform": 3,
            "login_count": 8,
            "game_completed": 13 
        } ,
        {
            "dt": "2010-12-31",
            "platform": 3,
            "login_count": 8,
            "game_completed": 13 
        } 
    }
},{"appid":2,"userid":404915...}

我需要查询:

unique logins of users who signed up between Date and Date+7 and logged in within Date

然后:

Unique logins of users who signed up between Date and Date+7, and logged in between Date+7 and Date+14

请指导我如何实现此任何示例/示例？基于此将非常有帮助:-)

非常感谢!

Answer 1

以下是获取第一个查询结果的方法:

var start = new Date(2010, 11, 25);
var end = new Date(2010, 12, 1);

db.users.distinct("userid", {"signup.dt" : {$gte: start, $lte: end},
      "activity" : {"$elemMatch" : { dt: {$gte: start, $lte: end}}}});

第二个类似，将开始日期和结束日期添加到事件后的日期中 7 天。