Question

记录::

{
    "_id" : ObjectId("5526040fc58e95b598cf1bc6"),
    "group" : [ 
        [ 
            {
                "userId" : "551b71dbb47628dd9e2882e0",
                "socketid" : "",
                "group_name" : "A1",
                "un" : "robot20",
                "pp" : "https://graph.facebook.com/347571208785861/picture?height=90&width=90",
                "is_robot" : true
            }, 
            {
                "userId" : "551b71ddb47628dd9e2882e1",
                "socketid" : "",
                "group_name" : "A2",
                "un" : "robot21",
                "pp" : "https://graph.facebook.com/347571208785861/picture?height=90&width=90",
                "is_robot" : true
            }
        ], 
        [ 
            {
                "userId" : "551cd7656c55761724e3a0e0",
                "socketid" : "cInGsNcr9G9OMvVyAAAA",
                "group_name" : "B1",
                "un" : "Hardik Ranapariya",
                "pp" : "https://graph.facebook.com/347571208785861/picture?height=90&width=90"
            }, 
            {
                "userId" : "551b71deb47628dd9e2882e2",
                "socketid" : "",
                "group_name" : "B2",
                "un" : "robot22",
                "pp" : "https://graph.facebook.com/347571208785861/picture?height=90&width=90",
                "is_robot" : true
            }
        ], 
        [ 
            {
                "userId" : "551b71e0b47628dd9e2882e3",
                "socketid" : "",
                "group_name" : "C1",
                "un" : "robot23",
                "pp" : "https://graph.facebook.com/347571208785861/picture?height=90&width=90",
                "is_robot" : true
            }, 
            {
                "userId" : "551b71e1b47628dd9e2882e4",
                "socketid" : "",
                "group_name" : "C2",
                "un" : "robot24",
                "pp" : "https://graph.facebook.com/347571208785861/picture?height=90&width=90",
                "is_robot" : true
            }
        ], 
        [ 
            {
                "userId" : "551b71e3b47628dd9e2882e5",
                "socketid" : "",
                "group_name" : "D1",
                "un" : "robot25",
                "pp" : "https://graph.facebook.com/347571208785861/picture?height=90&width=90",
                "is_robot" : true
            }, 
            {
                "userId" : "551b71e8b47628dd9e2882e8",
                "socketid" : "",
                "group_name" : "D2",
                "un" : "robot28",
                "pp" : "https://graph.facebook.com/347571208785861/picture?height=90&width=90",
                "is_robot" : true
            }
        ]
    ],
    "group2" : [ 
        [ 
            {
                "userId" : "551b71ddb47628dd9e2882e1",
                "socketid" : "",
                "group_name" : "A2",
                "un" : "robot21",
                "pp" : "https://graph.facebook.com/347571208785861/picture?height=90&width=90",
                "is_robot" : true
            }
        ], 
        [ 
            {
                "userId" : "551b71e1b47628dd9e2882e4",
                "socketid" : "",
                "group_name" : "C2",
                "un" : "robot24",
                "pp" : "https://graph.facebook.com/347571208785861/picture?height=90&width=90",
                "is_robot" : true
            }, 
            {
                "userId" : "551b71e8b47628dd9e2882e8",
                "socketid" : "",
                "group_name" : "D2",
                "un" : "robot28",
                "pp" : "https://graph.facebook.com/347571208785861/picture?height=90&width=90",
                "is_robot" : true
            }
        ]
    ],
    "group3" : [ 
        {
            "userId" : "551b71e1b47628dd9e2882e4",
            "socketid" : "",
            "group_name" : "C2",
            "un" : "robot24",
            "pp" : "https://graph.facebook.com/347571208785861/picture?height=90&width=90",
            "is_robot" : true
        }
    ],
    "status" : 1
}

我希望在组数组中使用userId找到此记录。

这里，userId是数组中的数组，然后是对象。所以请帮我解决这个问题。

我也尝试以下查询来查找

db.test.find({'group.user':'551b71dbb47628dd9e2882e0'})

但它不起作用。

提前感谢..

Answer 1

要查找嵌套的数组文档数组，请使用mongo $elemMatch。查询如下

db.collectionName.find({"group":{"$elemMatch":
                       {"$elemMatch":{"userId":"551b71dbb47628dd9e2882e0"}}}},
                       {"group.$":1}
                       ).pretty()

Answer 2

拼写错误，

db.test.find({'group.userId':'551b71dbb47628dd9e2882e0'})

user =＆gt;用户ID。

你还可以进行“$ elemMatch”操作：

db.test.find (
     {group:
         { $elemMatch: {userId:"551b71dbb47628dd9e2882e0"}}
     },
     {"group.$":1}
})

Answer 3

由于它涉及查询嵌套数组元素，如果你知道数组的索引，可以使用下面的代码。

注意：运算符不能用于遍历多个数组的查询（See for more）

db.test.find({"group": {"$elemMatch": {"0.userId": "551b71dbb47628dd9e2882e0"}}})

MongoDB在对象中的Array中查找

3 个答案: