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Matching MongoDB collection items by id?
To match collection items by id, use $in in MongoDB. Let us create a collection with documents −
> db.demo528.insertOne({"Name":"Chris",Age:21});{ "acknowledged" : true, "insertedId" : ObjectId("5e8b00d2ef4dcbee04fbbbe0") } > db.demo528.insertOne({"Name":"Bob",Age:22});{ "acknowledged" : true, "insertedId" : ObjectId("5e8b00d9ef4dcbee04fbbbe1") } > db.demo528.insertOne({"Name":"David",Age:20});{ "acknowledged" : true, "insertedId" : ObjectId("5e8b00e0ef4dcbee04fbbbe2") }
Display all documents from a collection with the help of find() method −
> db.demo528.find();
This will produce the following output −
{ "_id" : ObjectId("5e8b00d2ef4dcbee04fbbbe0"), "Name" : "Chris", "Age" : 21 } { "_id" : ObjectId("5e8b00d9ef4dcbee04fbbbe1"), "Name" : "Bob", "Age" : 22 } { "_id" : ObjectId("5e8b00e0ef4dcbee04fbbbe2"), "Name" : "David", "Age" : 20 }
Following is the query to match collection item by id −
> db.demo528.find({ _id: {$in:[ObjectId("5e8b00d2ef4dcbee04fbbbe0"),ObjectId("5e8b00e0ef4dcbee04fbbbe2")]} });
This will produce the following output −
{ "_id" : ObjectId("5e8b00d2ef4dcbee04fbbbe0"), "Name" : "Chris", "Age" : 21 } { "_id" : ObjectId("5e8b00e0ef4dcbee04fbbbe2"), "Name" : "David", "Age" : 20 }
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