CODEWITHSUNDEEP
mongodb
Tyra
Tyra

Reputation: 531

How to replace an object in a MongoDB record?

How to replace third_id in this record (only one document needs to be updated)? 

> db.collection.find( {"_id" : ObjectId("4f90cf0cd4bea011930001a3"), "first_id": ObjectId("4edf056800126757c000000f")}) { "second_id" : ObjectId("4f355e430012671d77000ec0"), "third_id" : ObjectId("4edf056800126757c000000f"), "note" : "blah-blah"}

Like this?

db.collection.update( { {"_id" : ObjectId("4f90cf0cd4bea011930001a3"), "third_id" : ObjectId("5edf056800126757c000000f")}, , true )

Tutorial says: db.collection.update( criteria, objNew, upsert, multi )

Arguments:

criteria - query which selects the record to update;

objNew - updated object or $ operators (e.g., $inc) which manipulate the object

upsert - if this should be an "upsert" operation; that is, if the record(s) do not exist, insert one. Upsert only inserts a single document.

multi - indicates if all documents matching criteria should be updated rather than just one. Can be useful with the $ operators below.

Upvotes: 0

Views: 2382

Answers (1)

Ian Mercer
Ian Mercer

Reputation: 39277

Since you only want to update a single document and you aren't trying to do an upsert and you don't want to replace the whole document but just one field, you can do:

db.collection.update( { {"_id" : ObjectId("4f90cf0cd4bea011930001a3"), 
                      { $set : {"third_id" : ObjectId("5edf056800126757c000000f") } } )

Upvotes: 2

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