无法使用 $pullAll

Question

我有一个集合，其中包含如下所示的文档

{ 
    "_id" : ObjectId("56d92901f9d573cc1c1fb8bb"), 
    "busEntryExitInformation" : {
        "dateTime" : ISODate("2016-03-04T06:19:45.914+0000"), 
        "busEntryExitEvent" : [
            {
                "plateNumber" : "ADFN3R2", 
                "direction" : "EXIT", 
                "routeNumber" : NumberInt(929), 
                "driverID" : "DId5", 
                "driverName" : "john", 
                "_id" : ObjectId("56d92901f9d573cc1c1fb8c0")
            }, 
            {
                "plateNumber" : "ADFN3R4", 
                "direction" : "EXIT", 
                "routeNumber" : NumberInt(652), 
                "driverID" : "DId2", 
                "driverName" : "jack", 
                "_id" : ObjectId("56d92901f9d573cc1c1fb8bf")
            }, 
            {
                "plateNumber" : "ADFN3R8", 
                "direction" : "EXIT", 
                "routeNumber" : NumberInt(500), 
                "driverID" : "DId5", 
                "driverName" : "john", 
                "_id" : ObjectId("56d92901f9d573cc1c1fb8be")
            }, 
            {
                "plateNumber" : "ADFN3R7", 
                "direction" : "ENTRY", 
                "routeNumber" : NumberInt(500), 
                "driverID" : "DId3", 
                "driverName" : "mack", 
                "_id" : ObjectId("56d92901f9d573cc1c1fb8bd")
            }, 
            {
                "plateNumber" : "ADFN3R2", 
                "direction" : "EXIT", 
                "routeNumber" : NumberInt(652), 
                "driverID" : "DId2", 
                "driverName" : "sandesh", 
                "_id" : ObjectId("56d92901f9d573cc1c1fb8bc")
            }
        ], 
        "cameraIntrinsics" : {
            "cameraFocalLength" : NumberInt(35), 
            "cameraAngle" : NumberInt(20), 
            "imageWidth" : "1920", 
            "imageHeight" : "1080", 
            "frameRate" : NumberInt(25)
        }, 
        "cameraExtrinsics" : {
            "cameraId" : NumberInt(1), 
            "cameraName" : "Under Route-090 NorthboundBridge", 
            "cameraDirection" : "Towards Northbound Lanes", 
            "cameraLatitude" : 1.350228, 
            "cameraLongitude" : 103.984889, 
            "cameraHeight" : NumberInt(30)
        }
    }, 
    "__v" : NumberInt(0)
}
}

其中 busEntryExitEvent 是一个数组，我正在尝试删除集合中所有文档的方向退出的数组元素结果应包含所有带有方向条目的文档

  { 
        "_id" : ObjectId("56d92901f9d573cc1c1fb8bb"), 
        "busEntryExitInformation" : {
            "dateTime" : ISODate("2016-03-04T06:19:45.914+0000"), 
            "busEntryExitEvent" : [

                {
                    "plateNumber" : "ADFN3R7", 
                    "direction" : "ENTRY", 
                    "routeNumber" : NumberInt(500), 
                    "driverID" : "DId3", 
                    "driverName" : "mack", 
                    "_id" : ObjectId("56d92901f9d573cc1c1fb8bd")
                }
            ], 
            "cameraIntrinsics" : {
                "cameraFocalLength" : NumberInt(35), 
                "cameraAngle" : NumberInt(20), 
                "imageWidth" : "1920", 
                "imageHeight" : "1080", 
                "frameRate" : NumberInt(25)
            }, 
            "cameraExtrinsics" : {
                "cameraId" : NumberInt(1), 
                "cameraName" : "Under Route-090 NorthboundBridge", 
                "cameraDirection" : "Towards Northbound Lanes", 
                "cameraLatitude" : 1.350228, 
                "cameraLongitude" : 103.984889, 
                "cameraHeight" : NumberInt(30)
            }
        }, 
        "__v" : NumberInt(0)
    }
    }

我正在尝试这样做

db.busEntryExitDoc.update(
      {  $pull: { busEntryExitEvent: {  "direction" : "EXIT"} } },
      { multi: false }
      )

必须对所有文档执行此操作此处没有 where 条件如何操作请帮助

Answer 1

你做错了 .update() 的第一个参数是 "query" 参数，这里应该是一个空文档。

db.busEntryExitDoc.update( 
    {},
    {  $pull: { "busEntryExitInformation.busEntryExitEvent": { "direction": "EXIT" }  } },
    {  multi: true }
)

同样的事情适用于 .updateMany() 方法

db.busEntryExitDoc.update( 
    {},
    {  $pull: { "busEntryExitInformation.busEntryExitEvent":  { "direction": "EXIT" }  } },
)

Answer 2

MongoDB update() 方法需要三个参数：db.collection.update(query, update, options)。如果要对所有文档执行 update，只需使用一个空对象作为 query:

db.busEntryExitDoc.update({},
    { $pull: { 'busEntryExitInformation.busEntryExitEvent' : {'direction' : "EXIT"} } },
    { multi: true }
);

另外，请注意 dot notation to access the array field: you have to point the $pull operator to an array otherwise the operation fails. Finally, use { multi: true } as options 的使用，因为您要更新集合中的所有文档。

无法使用 $pullAll

unable to use $pullAll

arrays

mongodb

pull