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How to find through list of ids in MongoDB?
You can use $in operator to find through the list of ids in MongoDB. To understand the concept, let us create a collection with the document. The query to create a collection with a document is as follows −
> db.findListOfIdsDemo.insertOne({"StudentName":"Carol","StudentAge":21}); { "acknowledged" : true, "insertedId" : ObjectId("5c8ecadd2f684a30fbdfd575") } > db.findListOfIdsDemo.insertOne({"StudentName":"Bob","StudentAge":25}); { "acknowledged" : true, "insertedId" : ObjectId("5c8ecae42f684a30fbdfd576") } > db.findListOfIdsDemo.insertOne({"StudentName":"David","StudentAge":22}); { "acknowledged" : true, "insertedId" : ObjectId("5c8ecaed2f684a30fbdfd577") } > db.findListOfIdsDemo.insertOne({"StudentName":"John","StudentAge":20}); { "acknowledged" : true, "insertedId" : ObjectId("5c8ecaf82f684a30fbdfd578") } > db.findListOfIdsDemo.insertOne({"StudentName":"Mike","StudentAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5c8ecb092f684a30fbdfd579") }
Display all documents from a collection with the help of find() method. The query is as follows −
> db.findListOfIdsDemo.find().pretty();
The following is the output −
{ "_id" : ObjectId("5c8ecadd2f684a30fbdfd575"), "StudentName" : "Carol", "StudentAge" : 21 } { "_id" : ObjectId("5c8ecae42f684a30fbdfd576"), "StudentName" : "Bob", "StudentAge" : 25 } { "_id" : ObjectId("5c8ecaed2f684a30fbdfd577"), "StudentName" : "David", "StudentAge" : 22 } { "_id" : ObjectId("5c8ecaf82f684a30fbdfd578"), "StudentName" : "John", "StudentAge" : 20 } { "_id" : ObjectId("5c8ecb092f684a30fbdfd579"), "StudentName" : "Mike", "StudentAge" : 23 }
Here is the query to find through the list of ids −
> var listOfIds = ['5c8ecae42f684a30fbdfd576', '5c8ecaf82f684a30fbdfd578']; > var documentIds = listOfIds.map(function(myId) { return ObjectId(myId); }); > db.findListOfIdsDemo.find({_id: {$in: documentIds }}).pretty();
The following is the output −
{ "_id" : ObjectId("5c8ecae42f684a30fbdfd576"), "StudentName" : "Bob", "StudentAge" : 25 } { "_id" : ObjectId("5c8ecaf82f684a30fbdfd578"), "StudentName" : "John", "StudentAge" : 20 }
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