pymongo 如何查询一个字典数组中的某个KEY对应某个值?

Question

如下的mongo文档,要查询MemberList里面的列表是否有"Uin" : 1589615073的列表项,"NickName" : "暖暖的",如果有返回这个列表项,而不是整个文档?
请教大神这应该怎么查询

{
    "_id" : ObjectId("5831b10d3a5ef837e46ccdb2"),
    "UserName" : "@@5e053d26153e603bbb2a9c615a37482c740673b166e54eb9bceab3fa30502626",
    "City" : "",
    "DisplayName" : "",
    "UniFriend" : 0,
    "MemberList" : [ 
        {
            "UserName" : "@fd6b0f325e4daa1eb7e5c1fae0c13991950e6e32a4a58e3e8aa51f2a2fc6a663",
            "RemarkPYQuanPin" : "",
            "DisplayName" : "",
            "KeyWord" : "",
            "PYInitial" : "",
            "Uin" : NumberLong(2720082935),
            "RemarkPYInitial" : "",
            "PYQuanPin" : "",
            "MemberStatus" : 0,
            "NickName" : "天",
            "AttrStatus" : NumberLong(2147586117)
        }, 
        {
            "UserName" : "@8956e035c85ab0aa722d2b12c7c6cae9332de68e9aade6433e41ad805387ae0a",
            "RemarkPYQuanPin" : "",
            "DisplayName" : "",
            "KeyWord" : "",
            "PYInitial" : "",
            "Uin" : 40283062,
            "RemarkPYInitial" : "",
            "PYQuanPin" : "",
            "MemberStatus" : 0,
            "NickName" : "员",
            "AttrStatus" : NumberLong(2147487781)
        }, 
        {
            "UserName" : "@73416f68eac03cfd77833f90fb023f664d7380740deef5d8043dc2400c0ef8a7",
            "RemarkPYQuanPin" : "",
            "DisplayName" : "",
            "KeyWord" : "",
            "PYInitial" : "",
            "Uin" : 1589615073,
            "RemarkPYInitial" : "",
            "PYQuanPin" : "",
            "MemberStatus" : 0,
            "NickName" : "暖暖的",
            "AttrStatus" : 16781349
        }, 
        {
            "UserName" : "@a1bf7a55ad8478017b95124774687769",
            "RemarkPYQuanPin" : "",
            "DisplayName" : "",
            "KeyWord" : "iss",
            "PYInitial" : "",
            "Uin" : 12266535,
            "RemarkPYInitial" : "",
            "PYQuanPin" : "",
            "MemberStatus" : 0,
            "NickName" : "一二三",
            "AttrStatus" : NumberLong(2181050407)
        }, 
        {
            "UserName" : "@5571e120b5d8f54f93338c76f62b9c419b818c29373dca9f331c2911a203bfbe",
            "RemarkPYQuanPin" : "",
            "DisplayName" : "",
            "KeyWord" : "",
            "PYInitial" : "",
            "Uin" : NumberLong(3379331828),
            "RemarkPYInitial" : "",
            "PYQuanPin" : "",
            "MemberStatus" : 0,
            "NickName" : "灵灵八",
            "AttrStatus" : 4133
        }
    ],
    "PYQuanPin" : "qunhaoquerenqun2",
    "RemarkPYInitial" : "",
    "Uin" : "7555117026@chatroom",
    "AppAccountFlag" : 0,
    "VerifyFlag" : 0,
    "Province" : "",
    "KeyWord" : "",
    "RemarkName" : "",
    "self" : {
        "UserName" : "@4babcdd9789c909048a51a069eb37b635f4f79bc5dfc2b5ae6e7325e16848e2b",
        "RemarkPYQuanPin" : "",
        "DisplayName" : "",
        "KeyWord" : "",
        "PYInitial" : "",
        "Uin" : 1589615073,
        "RemarkPYInitial" : "",
        "PYQuanPin" : "",
        "MemberStatus" : 0,
        "NickName" : "暖暖的",
        "AttrStatus" : 4133
    },
    "ChatRoomId" : 0,
    "isAdmin" : false,
    "ContactType" : 0,
    "HideInputBarFlag" : 0,
    "EncryChatRoomId" : "@96c72d96a6c3f9936768b28ffbfaadff",
    "AttrStatus" : 0,
    "Statues" : 1,
    "SnsFlag" : 0,
    "MemberCount" : 5,
    "OwnerUin" : NumberLong(2720082935),
    "Alias" : "",
    "Signature" : "",
    "ContactFlag" : 2,
    "NickName" : "群号确认群2",
    "ChatRoomOwner" : "@1f6ddf50c372ba088a9b8f61670a8cfa5873ede35810a60b4076486eac6c20e2",
    "RemarkPYQuanPin" : "",
    "HeadImgUrl" : "/cgi-bin/mmwebwx-bin/webwxgetheadimg?seq=0&username=@@5e053d26153e603bbb2a9c615a37482c740673b166e54eb9bceab3fa30502626&skey=",
    "Sex" : 0,
    "StarFriend" : 0,
    "PYInitial" : "QHQRQ2",
    "HeadImgUpdateFlag" : 1,
    "effectCate" : "测试"
}

Answer 1

用$elemMatch实现

 db.test1.find({}, {"MemberList":{"$elemMatch":{"Uin":1589615073,"NickName":"暖暖的"}}})