unable to use $pullAll - arrays

Question

I have a collection which contains the documents as shown below
{
"_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)
}
}
where busEntryExitEvent is a array i am trying to remove the array elements where direction is exit across all the documents in the collection
result should contain all the documents with direction entry
{
"_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)
}
}
i am trying to do like this
db.busEntryExitDoc.update(
{ $pull: { busEntryExitEvent: { "direction" : "EXIT"} } },
{ multi: false }
)
this has to be done to all the documents there is no where condition here how to do it please help

Answer 1

The MongoDB update() methods expects three arguments: db.collection.update(query, update, options). If you want to perform the update on all documents, just use an empty object as query:
db.busEntryExitDoc.update({},
{ $pull: { 'busEntryExitInformation.busEntryExitEvent' : {'direction' : "EXIT"} } },
{ multi: true }
);
Also, note the use of the 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 since you want to update all the documents in your collection.

Answer 2

You are doing it wrong the first argument to .update() is the "query" argument which should be an empty document here.
db.busEntryExitDoc.update(
{},
{ $pull: { "busEntryExitInformation.busEntryExitEvent": { "direction": "EXIT" } } },
{ multi: true }
)
The same thing apply to the .updateMany() method
db.busEntryExitDoc.update(
{},
{ $pull: { "busEntryExitInformation.busEntryExitEvent": { "direction": "EXIT" } } },
)