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Pull an element in sub of sub-array in MongoDB?
To pull an element, use $pull along with $(positional) operator. Let us create a collection with documents −
> db.demo679.insertOne(
... {
... id:1,
... "details": [
... {
... CountryName:"US",
... "information": [
...
... { "Name": "Chris", "FirstName": "Name=Chris" },
...
... {"Name": "Bob", "FirstName": "Name=Bob" }
... ]
... },
... {
... CountryName:"UK",
... "information": [
...
... { "Name": "Robert", "FirstName": "Name=Robert" },
...
... {"Name": "Sam", "FirstName": "Name=Sam" }
... ]
... }
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5ea442cf04263e90dac943fd")
}Display all documents from a collection with the help of find() method −
> db.demo679.find();
This will produce the following output −
{ "_id" : ObjectId("5ea442cf04263e90dac943fd"), "id" : 1, "details" : [
{ "CountryName" : "US", "information" : [
{ "Name" : "Chris", "FirstName" : "Name=Chris" },
{ "Name" : "Bob", "FirstName" : "Name=Bob" }
] },
{ "CountryName" : "UK", "information" : [
{ "Name" : "Robert", "FirstName" : "Name=Robert" },
{ "Name" : "Sam", "FirstName" : "Name=Sam" }
] }
] }Following is the query to pull an element in sub of sub-array in MongoDB −
> db.demo679.update(
... { "details.CountryName":"US" },
... { $pull: { 'details.$.information': { "Name" : "Bob", "FirstName" : "Name=Bob" } } }
... );
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo679.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5ea442cf04263e90dac943fd"),
"id" : 1,
"details" : [
{
"CountryName" : "US",
"information" : [
{
"Name" : "Chris",
"FirstName" : "Name=Chris"
}
]
},
{
"CountryName" : "UK",
"information" : [
{
"Name" : "Robert",
"FirstName" : "Name=Robert"
},
{
"Name" : "Sam",
"FirstName" : "Name=Sam"
}
]
}
]
}
Updated on: 14-May-2020
309 Views
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