This tutorial explains the crucial difference between updating a document and replacing one in MongoDB, and shows you how to use the correct operations.

What you will learn:

The Key Difference: An Update (using updateOne, updateMany) changes specific fields in a document using operators like $set. A Replace (using replaceOne) deletes the entire document and inserts a new one in its place (keeping the original _id).

db.collection.updateOne(): How to modify the first document that matches your query.

db.collection.updateMany(): How to modify all documents that match your query.

db.collection.replaceOne(): How to completely replace a single document.

Key Update Operators: We'll show you how to use $set (to change a field), $inc (to increment a number), and $unset (to remove a field).

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

Example (replaceOne): db.users.replaceOne({ name: "Alice" }, { name: "New Alice", status: "Active" })

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