How does replaceOne() differ from updateOne()?
The difference is that updateOne() only changes the specified fields, while replaceOne() fully replaces the document with a new one.
In short:
| Method | What it does |
|---|---|
updateOne() | Updates the chosen fields using operators ($set, $inc, $unset, etc.) |
replaceOne() | Fully replaces the entire document with a new one, except for _id |
updateOne() example (a partial update):
js
db.users.updateOne(
{ name: "Alex" },
{ $set: { age: 26 } }
)- only the
agefield changes, everything else stays as it was.
replaceOne() example (a full replacement):
js
db.users.replaceOne(
{ name: "Alex" },
{ name: "Alex", age: 26, verified: true }
)- the old document is deleted and replaced by the new one (if the old one had other fields, they're gone).
The summary for a junior developer:
updateOne() updates partially.
replaceOne() overwrites the document entirely.
Short Answer
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