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Pull multiple objects from an array in MongoDB?
To pull multiple objects from an array, you can use $pull operator. Let us first create a collection with documents −
> db.pullMultipleObjectsDemo.insertOne(
... {
... "ClientId" : "100",
... "ClientName" : "John",
... "ClientPersonalDetails" : [
... {
... "ClientCountryName" : "US",
... "ClientProjectName" : "Online Book Store",
...
... },
... {
... "ClientCountryName" : "AUS",
... "ClientProjectName" : "Online Fee Management",
...
... },
... {
... "ClientCountryName" : "UK",
... "ClientProjectName" : "Online Pig Dice Game",
...
... },
... {
... "ClientCountryName" : "ANGOLA",
... "ClientProjectName" : "Online Hospital Management",
...
... }
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5cc7d0748f9e6ff3eb0ce43d")
}Following is the query to display all documents from a collection with the help of find() method −
> db.pullMultipleObjectsDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cc7d0748f9e6ff3eb0ce43d"),
"ClientId" : "100",
"ClientName" : "John",
"ClientPersonalDetails" : [
{
"ClientCountryName" : "US",
"ClientProjectName" : "Online Book Store"
},
{
"ClientCountryName" : "AUS",
"ClientProjectName" : "Online Fee Management"
},
{
"ClientCountryName" : "UK",
"ClientProjectName" : "Online Pig Dice Game"
},
{
"ClientCountryName" : "ANGOLA",
"ClientProjectName" : "Online Hospital Management"
}
]
}Following is the query to pull multiple objects from an array −
> db.pullMultipleObjectsDemo.update(
... {"_id": ObjectId("5cc7d0748f9e6ff3eb0ce43d")},
... {"$pull":{"ClientPersonalDetails":{"ClientProjectName":{$in:["Online Book Store","Online Pig Dice Game"]}}}}
... );
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Let us display all documents from the collection in order to check the objects have been removed from an array or not. The query is as follows −
> db.pullMultipleObjectsDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cc7d0748f9e6ff3eb0ce43d"),
"ClientId" : "100",
"ClientName" : "John",
"ClientPersonalDetails" : [
{
"ClientCountryName" : "AUS",
"ClientProjectName" : "Online Fee Management"
},
{
"ClientCountryName" : "ANGOLA",
"ClientProjectName" : "Online Hospital Management"
}
]
}Look at the above sample output, the multiple objects have been removed from the array.
Updated on: 30-Jul-2019
758 Views
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