Mongodb : How should I get original Json structure after filter the records based on requirement? - mongodb

Question

I am new to mongodb.
I have a Json document in collection like :
{
"_id" : ObjectId("55abf32f358e3aca807f0e6a"),
"usercbid" : 1995492.0000000000000000,
"defaultnotifytype" : {
"status" : true,
"alert" : true,
"action" : true
},
"calendar" : {
"alert" : 2468.0000000000000000,
"action" : 13579.0000000000000000,
"status" : 123456.0000000000000000
},
"assignment" : [
{
"orgid" : {
"service" : "AVPN",
"adminemail" : "pl9129#att.com",
"notifytype" : {
"status" : true,
"alert" : true
},
"keytype" : "MCN",
"KeyValue" : "SK1383"
}
},
{
"orgid" : {
"KeyValue" : "DD3342",
"service" : "<all>",
"keytype" : "MCN"
}
},
{
"orgid" : {
"notifytype" : {
"optout" : true
},
"keytype" : "MCN",
"keyvalue" : "<all>",
"service" : "MVPN"
}
},
{
"order" : {
"date" : "2015-03-15",
"adminemail" : "abc.com",
"notifytype" : {
"alert" : true
},
"id" : 123456.0000000000000000
}
},
{
"order" : {
"id" : 135246.0000000000000000,
"date" : "2015-03-17",
"adminemail" : "abc.com"
}
}
]
}
I would like to filter above json document with following condition:
var result = db.subscription.aggregate(
[ { $unwind: "$assignment" }
, {$match : {$or:
[
{
"assignment.order.id" : 123456
},
{
"assignment.orgid.keytype" : { $in: ["MCN"]}
,"assignment.orgid.KeyValue" : { $in: ["<all>","SK1383"]}
,"assignment.orgid.service" : { $in: ["<all>","AVPN"]}
}
]
}
}
,{$group: {_id: "$_id", assignment: {$push: "$assignment"}}}
// ,{$project : { usercbid : $usercbid, defaultnotifytype : 1, calendar : 1, assignment: 1} }
]
)
printjson(result);
Result of above query is :
{
"result" : [
{
"_id" : ObjectId("55abf32f358e3aca807f0e6a"),
"assignment" : [
{
"orgid" : {
"service" : "AVPN",
"adminemail" : "pl9129#att.com",
"notifytype" : {
"status" : true,
"alert" : true
},
"keytype" : "MCN",
"KeyValue" : "SK1383"
}
},
{
"order" : {
"date" : "2015-03-15",
"adminemail" : "pl9129#att.com",
"notifytype" : {
"alert" : true
},
"id" : 123456
}
}
]
}
],
"ok" : 1
}
But my final result lost the following original content:
"usercbid" : 1995492.0000000000000000,
"defaultnotifytype" : {
"status" : true,
"alert" : true,
"action" : true
},
"calendar" : {
"alert" : 2468.0000000000000000,
"action" : 13579.0000000000000000,
"status" : 123456.0000000000000000
},
How should I append above original content with filtered records?
Thanks,

Answer 1

$Fisrt is the operator which helps you getting the required output.
When you do a $Group, the result of the $Group pipeline operator contains only those fields which are specified inside the $Group pipeline operator.
So, from your query we can notice that you are grouping based on "_Id" and you are selecting only "assignment" key field, so the OUTPUT of this group pipeline operator will contain only those 2 fileds ( "_ID" and "assignment" ).
To make sure that the other left out feilds ( usercbid, defaultnotifytype , calendar ) to be part of the $Group pipeline output, we need to mention that explicitly in the Group pipeline using $First as below :
{ $group: { _id: "$_id", assignment: {$push: "$assignment"},
usercbid : { $first : "usercbid"} ,
defaultnotifytype : { $first : "defaultnotifytype" } ,
calendar : { $first : "calendar"}
}
}
$First Returns the value that results from applying an expression to the first document in a group of documents that share the same group by key.
Please check the below query, it will help you in fetching the required output :
var result = db.subscription.aggregate(
[ { $unwind: "$assignment" }
, { $match : {$or:
[
{
"assignment.order.id" : 123456
},
{
"assignment.orgid.keytype" : { $in: ["MCN"]}
,"assignment.orgid.KeyValue" : { $in: ["<all>","SK1383"]}
,"assignment.orgid.service" : { $in: ["<all>","AVPN"]}
}
]
}
}
,{ $group: { _id: "$_id", assignment: {$push: "$assignment"},
usercbid : { $first : "usercbid"} ,
defaultnotifytype : { $first : "defaultnotifytype" } ,
calendar : { $first : "calendar"}
}
}
]
).pretty();