Let us first create a collection with documents −
> db.findByObjectIdDemo.insertOne({"ClientName":"Larry","ClientAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5cd68cd657806ebf1256f11a") } > db.findByObjectIdDemo.insertOne({"ClientName":"Chris","ClientAge":26}); { "acknowledged" : true, "insertedId" : ObjectId("5cd68cdc57806ebf1256f11b") } > db.findByObjectIdDemo.insertOne({"ClientName":"David","ClientAge":38,"isMarried":true}); { "acknowledged" : true, "insertedId" : ObjectId("5cd68cf657806ebf1256f11c") }
Following is the query to display all documents from a collection with the help of find() method −
> db.findByObjectIdDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cd68cd657806ebf1256f11a"), "ClientName" : "Larry", "ClientAge" : 23 } { "_id" : ObjectId("5cd68cdc57806ebf1256f11b"), "ClientName" : "Chris", "ClientAge" : 26 } { "_id" : ObjectId("5cd68cf657806ebf1256f11c"), "ClientName" : "David", "ClientAge" : 38, "isMarried" : true }
Following is the query to find by ObjectId −
> db.findByObjectIdDemo.find({_id: new ObjectId("5cd68cf657806ebf1256f11c")}).toArray(function(err, myDocument) { console.log(myDocument); });
This will produce the following output −
[ { "_id" : ObjectId("5cd68cf657806ebf1256f11c"), "ClientName" : "David", "ClientAge" : 38, "isMarried" : true } ]