#mongo insert

To insert an object into MongoDB, you create it and then invoke the insert() method on the DBCollection into which it has to be pushed into.

https://gist.github.com/nofatclips/5637783

The output shows that the driver added an ID field upon the call:

{ "site" : "nofatclips.com" , "author" : "DeK"} { "site" : "nofatclips.com" , "author" : "DeK" , "_id" : { "$oid" : "519e4cdb04089e005378ac14"}}

The ID can also be added explicitly, as a new instance of ObjectId:

Before updating a collection, one obviously needs to insert data in it. The insert() method will create a new record:

db.products.insert( { item: "card", qty: 15 } )

An _id (primary key) value will be added automatically if not specified. If the primary key is specified but a document with that value already exist, you'll get an error:

> var card = db.products.findOne({"item": "card"}) > db.products.insert(card) E11000 duplicate key error index:     dek.products.$_id_  dup key:         { : ObjectId('5194973a65642aa95f1eb40f') }

If you want to insert a document (if new) or update an existing one, Mongo provides a useful wrapper around insert() and update(), the save() method: