Updating MongoDB Documents by Using updateOne()

The updateOne() method accepts a filter document, an update document, and an optional options object. MongoDB provides update operators and options to help you update documents. In this section, we'll cover three of them: $set, upsert, and $push.

$set

The $set operator replaces the value of a field with the specified value, as shown in the following code:

db.podcasts.updateOne(
  {
    _id: ObjectId("5e8f8f8f8f8f8f8f8f8f8f8"),
  },

  {
    $set: {
      subscribers: 98562,
    },
  }
)

upsert

The upsert option creates a new document if no documents match the filtered criteria. Here's an example:

db.podcasts.updateOne(
  { title: "The Developer Hub" },
  { $set: { topics: ["databases", "MongoDB"] } },
  { upsert: true }
)

$push

The $push operator adds a new value to the hosts array field. Here's an example:

db.podcasts.updateOne(
  { _id: ObjectId("5e8f8f8f8f8f8f8f8f8f8f8") },
  { $push: { hosts: "Nic Raboy" } }
)