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How to insert an item to an array that is inside an object in MongoDB?
To insert an item to an already created array inside an object, use MongoDB $push. Let us create a collection with documents −
> db.demo449.insertOne( ... { ... details1: { ... details2: [{ ... _id:new ObjectId(), ... Name:"Chris" ... }], ... details3: [{ ... _id:new ObjectId(), ... Name:"David" ... }] ... } ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5e7a40e971f552a0ebb0a6e3") }
Display all documents from a collection with the help of find() method −
> db.demo449.find();
This will produce the following output −
{ "_id" : ObjectId("5e7a40e971f552a0ebb0a6e3"), "details1" : { "details2" : [ { "_id" : ObjectId("5e7a40e971f552a0ebb0a6e1"), "Name" : "Chris" } ], "details3" : [ { "_id" : ObjectId("5e7a40e971f552a0ebb0a6e2"), "Name" : "David" } ] } }
Following is the query to insert an item to an array that is inside an object −
> db.demo449.update({_id:ObjectId("5e7a40e971f552a0ebb0a6e3")}, {$push: { 'details1.details2':{_id:ObjectId(),"Name":"Carol"}}}) WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 }
Display all documents from a collection with the help of find() method −
> db.demo449.find();
This will produce the following output −
{ "_id" : ObjectId("5e7a40e971f552a0ebb0a6e3"), "details1" : { "details2" : [ { "_id" : ObjectId("5e7a40e971f552a0ebb0a6e1"), "Name" : "Chris" }, { "_id" : ObjectId("5e7a41a671f552a0ebb0a6e5"), "Name" : "Carol" } ], "details3" : [ { "_id" : ObjectId("5e7a40e971f552a0ebb0a6e2"), "Name" : "David" } ] } }
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