MongoDB：查找完全匹配而没有错误的行

时间：2018-04-11 14:17:22

标签： mongodb

我有3张桌子：

accounts:[
{id:111,name:'john'},
{id:222,name:'due'}
]

workoutTypes:[
{id:1,title:'a'},
{id:2,title:'b'}
]

accountrecords:[
{_id:10,workoutTypeId:1,accountId:111},
{_id:11,workoutTypeId:1,accountId:222}
]

我使用此命令按照与当前帐户匹配的锻炼类型对所有帐户记录进行分组：

db.workoutTypes.aggregate([
            {
                $lookup: {
                    from: "accountrecords",
                    localField: "_id",
                    foreignField: "workoutTypeId",
                    as: "records"
                }

            },
            {
                $match: {
                    $and: [
                        { "records": { $ne: [] } },
                        { "records.accountId": { $eq: mongoose.Types.ObjectId(accountId) } },
                    ]
                }
            },
        ])

我获取与这两个帐户相关的记录的问题。 看到eq命令为非匹配值返回false值。

有一个选项可以只获取与当前帐户匹配的记录吗？

1 个答案:

答案 0 :(得分：1)

首先，localField个workoutTypes集合中的id必须是_id，而不是$redact。可能是你身边的一个错字。其次，如果要限制内容，则需要使用$match运算符。 db.workoutTypes.aggregate([ { $lookup: { from: "accountrecords", localField: "_id", foreignField: "workoutTypeId", as: "records" } }, {$match:{"records.accountId":{$exists:true}, "records.accountId":{$eq:ObjectId("5a604b18280420c03e8d3a23")}}}, {$redact:{ $cond:{ if:{$or:[{$eq:["$accountId",ObjectId("5a604b18280420c03e8d3a23")]},{$not:"$accountId"}]}, then:"$$DESCEND", else:"$$PRUNE" } }} ]) 实际上按预期工作，但它实际上并不检查所有子文档是否满足条件。

<强>更新：

尝试此查询：

/* 1 */
{
"_id" : ObjectId("5ac8b2b8fb45830ff77cd33b"),
"updatedAt" : ISODate("2018-04-07T11:59:52.583Z"),
"createdAt" : ISODate("2018-04-07T11:59:52.583Z"),
"title" : "Snatch",
"__v" : 0,
"records" : [ 
    {
        "_id" : ObjectId("5acb1b666b08493b30deed92"),
        "updatedAt" : ISODate("2018-04-09T07:51:02.294Z"),
        "createdAt" : ISODate("2018-04-09T07:51:02.294Z"),
        "accountId" : ObjectId("5a604b18280420c03e8d3a23"),
        "workoutTypeId" : ObjectId("5ac8b2b8fb45830ff77cd33b"),
        "repetition" : 4,
        "weight" : 120,
        "__v" : 0
    }, 
    {
        "_id" : ObjectId("5acb1b6f6b08493b30deed93"),
        "updatedAt" : ISODate("2018-04-09T07:51:11.878Z"),
        "createdAt" : ISODate("2018-04-09T07:51:11.878Z"),
        "accountId" : ObjectId("5a604b18280420c03e8d3a23"),
        "workoutTypeId" : ObjectId("5ac8b2b8fb45830ff77cd33b"),
        "repetition" : 5,
        "weight" : 130,
        "__v" : 0
    }, 
    {
        "_id" : ObjectId("5ace23aa1c4d590dc049e94e"),
        "updatedAt" : ISODate("2018-04-11T15:03:06.824Z"),
        "createdAt" : ISODate("2018-04-11T15:03:06.824Z"),
        "repetition" : 124,
        "weight" : 32,
        "accountId" : ObjectId("5a604b18280420c03e8d3a23"),
        "workoutTypeId" : ObjectId("5ac8b2b8fb45830ff77cd33b"),
        "__v" : 0
    }, 
    {
        "_id" : ObjectId("5ace23b21c4d590dc049e94f"),
        "updatedAt" : ISODate("2018-04-11T15:03:14.293Z"),
        "createdAt" : ISODate("2018-04-11T15:03:14.293Z"),
        "repetition" : 325,
        "weight" : 235,
        "accountId" : ObjectId("5a604b18280420c03e8d3a23"),
        "workoutTypeId" : ObjectId("5ac8b2b8fb45830ff77cd33b"),
        "__v" : 0
    }, 
    {
        "_id" : ObjectId("5acc8ef5345125417cca18e3"),
        "updatedAt" : ISODate("2018-04-10T10:16:21.709Z"),
        "createdAt" : ISODate("2018-04-10T10:16:21.709Z"),
        "repetition" : 123,
        "weight" : 456,
        "accountId" : ObjectId("5a604b18280420c03e8d3a23"),
        "workoutTypeId" : ObjectId("5ac8b2b8fb45830ff77cd33b"),
        "__v" : 0
    }
 ]
}

/* 2 */
{
"_id" : ObjectId("5acdf56afd5ca008d01b706f"),
"updatedAt" : ISODate("2018-04-11T11:45:46.192Z"),
"createdAt" : ISODate("2018-04-11T11:45:46.192Z"),
"title" : "Jerk",
"__v" : 0,
"records" : [ 
    {
        "_id" : ObjectId("5acdf597fd5ca008d01b7070"),
        "updatedAt" : ISODate("2018-04-11T11:46:31.674Z"),
        "createdAt" : ISODate("2018-04-11T11:46:31.674Z"),
        "repetition" : 12,
        "weight" : 100,
        "accountId" : ObjectId("5a604b18280420c03e8d3a23"),
        "workoutTypeId" : ObjectId("5acdf56afd5ca008d01b706f"),
        "__v" : 0
    }
  ]
 }

/* 3 */
{
"_id" : ObjectId("5ace336ed36c780e6ce76d5d"),
"updatedAt" : ISODate("2018-04-11T16:10:22.483Z"),
"createdAt" : ISODate("2018-04-11T16:10:22.483Z"),
"title" : "Weight lifting",
"__v" : 0,
"records" : [ 
    {
        "_id" : ObjectId("5ace337ed36c780e6ce76d5e"),
        "updatedAt" : ISODate("2018-04-11T16:10:38.708Z"),
        "createdAt" : ISODate("2018-04-11T16:10:38.708Z"),
        "repetition" : 21,
        "weight" : 100,
        "accountId" : ObjectId("5a604b18280420c03e8d3a23"),
        "workoutTypeId" : ObjectId("5ace336ed36c780e6ce76d5d"),
        "__v" : 0
    }
   ]
 }

/* 4 */
{
"_id" : ObjectId("5ac8cf5ef14469169d8627e8"),
"updatedAt" : ISODate("2018-04-07T14:02:06.155Z"),
"createdAt" : ISODate("2018-04-07T14:02:06.155Z"),
"title" : "Double under",
"__v" : 0,
"records" : [ 
    {
        "_id" : ObjectId("5acc8f11345125417cca18e4"),
        "updatedAt" : ISODate("2018-04-10T10:16:49.069Z"),
        "createdAt" : ISODate("2018-04-10T10:16:49.069Z"),
        "repetition" : 111111,
        "weight" : 222222,
        "accountId" : ObjectId("5a604b18280420c03e8d3a23"),
        "workoutTypeId" : ObjectId("5ac8cf5ef14469169d8627e8"),
        "__v" : 0
    }, 
    {
        "_id" : ObjectId("5ace2d7b1c4d590dc049e950"),
        "updatedAt" : ISODate("2018-04-11T15:44:59.722Z"),
        "createdAt" : ISODate("2018-04-11T15:44:59.722Z"),
        "weight" : 23,
        "repetition" : 123555555,
        "accountId" : ObjectId("5a604b18280420c03e8d3a23"),
        "workoutTypeId" : ObjectId("5ac8cf5ef14469169d8627e8"),
        "__v" : 0
    }
  ]
 }

/* 5 */
{
"_id" : ObjectId("5ac8cfdd79a48216b3e048b0"),
"updatedAt" : ISODate("2018-04-07T14:04:13.670Z"),
"createdAt" : ISODate("2018-04-07T14:04:13.670Z"),
"title" : "Push-ups",
"__v" : 0,
"records" : [ 
    {
        "_id" : ObjectId("5accc1f1cd58a407c6562f79"),
        "updatedAt" : ISODate("2018-04-10T13:53:53.933Z"),
        "createdAt" : ISODate("2018-04-10T13:53:53.933Z"),
        "repetition" : 123,
        "weight" : 456000,
        "accountId" : ObjectId("5a604b18280420c03e8d3a23"),
        "workoutTypeId" : ObjectId("5ac8cfdd79a48216b3e048b0"),
        "__v" : 0
    }
  ]
 }

输出是：

ObjectId("5a604b18280420c03e8d3a23")

现在，您只需使用您的猫鼬代码mongoose.Types.ObjectId(accountId) 替换 11-Apr-2018 17:46:00.353 SEVERE [http-nio-8080-exec-5] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [ProfileServlet] in context with path [] threw exception [Servlet execution threw an exception] with root causejava.lang.ClassNotFoundException: freemarker.template.TemplateException at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1275) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1104) at servlets.ProfileServlet.doGet(ProfileServlet.java:26) at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:407) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:844) ，您就应该感觉良好。

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