For updating collections and documents we can use any of these methods:

Methods

• update()
• updateOne()
• updateMany()
• replaceOne()

Update()

The update() method modifies one or many documents (update parameters)

db.lights.update(
   { room: "Bedroom" },
   { status: "On" }
)

This operation searches the ‘lights’ collection for a document where room is Bedroom (1st parameter). It then updates the matching documents status property to On (2nd parameter) and returns a WriteResult object that looks like this:

{ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 }

UpdateOne

The UpdateOne() method modifies ONE document (update parameters)

db.countries.update(
   { country: "Sweden" },
   { capital: "Stockholm" }
)

This operation searches the ‘countries’ collection for a document where country is Sweden (1st parameter). It then updates the matching documents property capital to Stockholm (2nd parameter) and returns a WriteResult object that looks like this:

{ "acknowledged" : true, "matchedCount" : 1, "modifiedCount" : 1 }

UpdateMany