how to copy subdocument into the same document - mongodb

Question

my need is copy one subdocument from a document and insert into the
same document.But i use forEach and findAndModify it can not insert
into the same document.
document example:
{
"_id" : ObjectId("59b5e84d71ab5580d643d070"),
"modifiedOn" : ISODate("2019-04-03T14:57:22.177+0000"),
"modifiedBy" : "XXX",
"createdOn" : ISODate("2017-09-09T16:33:34.464+0000"),
"createdBy" : "liuyu",
"channelSales" : [
{
"platform" : "amazon",
"channel" : "amazon_ca",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39dc1")
},
{
"platform" : "amazon",
"channel" : "amazon_uk",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39dc0")
},
{
"platform" : "amazon",
"channel" : "amazon_us",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39dbf")
},
{
"platform" : "amazon",
"channel" : "amazon_jp",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39dbe")
},
{
"platform" : "amazon",
"channel" : "amazon_de",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39dbd")
},
{
"platform" : "amazon",
"channel" : "amazon_es",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39dbc")
},
{
"platform" : "amazon",
"channel" : "amazon_fr",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39dbb")
},
{
"platform" : "amazon",
"channel" : "amazon_it",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39dba")
},
{
"platform" : "ebay",
"channel" : "ebay_au",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39db9")
},
{
"platform" : "ebay",
"channel" : "ebay_de",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39db8")
},
{
"platform" : "ebay",
"channel" : "ebay_es",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39db7")
},
{
"platform" : "ebay",
"channel" : "ebay_fr",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39db6")
},
{
"platform" : "ebay",
"channel" : "ebay_it",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39db5")
},
{
"platform" : "ebay",
"channel" : "ebay_uk",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39db4")
},
{
"platform" : "ebay",
"channel" : "ebay_us",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("59b5f86aaa0ee15555a39db3")
},
{
"platform" : "walmart",
"channel" : "walmart_us",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("5a4d9de2bb1aee844f03e1a6")
},
{
"platform" : "walmart",
"channel" : "walmart_ca",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("5a4d9de2bb1aee844f03e1a5")
},
{
"platform" : "amazon",
"channel" : "amazon_au",
"saleStatus" : "T",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("5abe095bb1d48d194f6187c0")
},
{
"platform" : "amazon",
"channel" : "amazon_in",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("5c9af2776f3dcf04491818f2")
}
],
"statusLevel" : "",
"statusType" : "",
"status" : "A",
"skuId" : "abc001",
"__v" : NumberInt(3)
}
i want to copy:
{
"platform" : "walmart",
"channel" : "walmart_us",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("5a4d9de2bb1aee844f03e1a6")
}
and change the "channel" : "walmart_dsv",the other files is the same like this :
{
"platform" : "walmart",
"channel" : "walmart_dsv",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"_id" : ObjectId("5a4d9de2bb1aee844f03e1a6")
}
and insert into the same document.
i use this command:
db.getCollection("0521").aggregate([
{$unwind: "$channelSales"},
{$project: {platform: "$channelSales.platform",
channel: "$channelSales.channel",
saleStatus: "$channelSales.saleStatus",
type: "$channelSales.type",
url: "$channelSales.url",
remark: "$channelSales.remark",
isCaught: "$channelSales.isCaught",
_id: "$channelSales._id"
}},
{ $match : { "channel" : "amazon_us"} }
]).forEach(function(award_team){
if(award_team != null)
{
db.getCollection("0521").findAndModify(
{
query: {_id: award_team._id},
update: { $push: {channelSales: [ {platform: award_team.platform, channel: "walmart_dsv", saleStatus: award_team.saleStatus, type: award_team.type, url: award_team.url, remark: award_team.remark, isCaught: award_team.isCaught, _id: award_team._id }] } },
upsert: true,
});
}
});
but it is add a new document,what can i do?

Answer 1

You are making a mistake in projection:
You are using sub-document _id to update the main document and you are using option {upsert: true} so every time it is inserting a new document in case it does not find _id.
Update your project as below:
db.collection.aggregate([
{$unwind: "$channelSales"},
{$project: {
_id: "$_id", // Main Document Id
platform: "$channelSales.platform",
channel: "$channelSales.channel",
saleStatus: "$channelSales.saleStatus",
type: "$channelSales.type",
url: "$channelSales.url",
remark: "$channelSales.remark",
isCaught: "$channelSales.isCaught",
channelSalesId: "$channelSales._id" // Sub-Document Id (Caannel Sales Id)
}},
{ $match : { "channel" : "amazon_us"} }
])
Now you will get a response like below:
{
"_id" : ObjectId("59b5e84d71ab5580d643d070"),
"platform" : "amazon",
"channel" : "amazon_us",
"saleStatus" : "A",
"type" : "",
"url" : "",
"remark" : "",
"isCaught" : "0",
"channelSalesId" : ObjectId("59b5f86aaa0ee15555a39dbf")
}
Now you can use "award_team._id" to update Document:
db.getCollection("0521").findAndModify(
{
query: {_id: award_team._id},
update: { $push: {channelSales: [ {platform: award_team.platform, channel: "walmart_dsv", saleStatus: award_team.saleStatus, type: award_team.type, url: award_team.url, remark: award_team.remark, isCaught: award_team.isCaught, _id: award_team._id }] } },
upsert: true,
});
}
});