How do i update a collection on mongodb?

[petulia3478]

Related:
How do i insert a document into a collection in mongodb?
How do i read a collection in mongodb?
How do i delete a document in a collection on mongodb?

Perform update, note the use of the $set operator. Here we added the Comments key.

> db.softwarelist.update({"Company" : "MongoDB"},
... {$set : { Comments: []}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })

Check update.

> db.softwarelist.find()
{ "_id" : ObjectId("5c24e11ba7354c80abcfb1f2"), "Company" : "MongoDB", "Type" : "Document Oriented Database", "Year" : 2009, "Comments" : [ ] }