MongoDB — Update

Update One

db.users.updateOne(
  { name: "John" },
  { $set: { age: 31 } }
)

Update Many

db.users.updateMany(
  { active: true },
  { $set: { lastLogin: new Date() } }
)

Update Operators

Operator	Description
$set	Set field value
$unset	Remove field
$inc	Increment value
$push	Add to array
$pull	Remove from array
$rename	Rename field

Examples

// Increment
db.users.updateOne({ name: "John" }, { $inc: { age: 1 } })

// Add to array
db.users.updateOne({ name: "John" }, { $push: { hobbies: "new" } })

// Remove from array
db.users.updateOne({ name: "John" }, { $pull: { hobbies: "old" } })

// Rename field
db.users.updateOne({ name: "John" }, { $rename: { "name": "fullName" } })

Upsert

db.users.updateOne(
  { name: "New User" },
  { $set: { email: "new@example.com" } },
  { upsert: true }
)

Replace

db.users.replaceOne(
  { name: "John" },
  { name: "John Doe", email: "new@example.com" }
)

Mini Practice

1. Update single document
2. Update multiple documents
3. Use upsert
4. Use different update operators

Up Next

Continue with Delete — deleting documents.