MongoDB Foundations·Documents with discipline

CRUD that stays predictable

Insert, read, update and delete with explicit filters and deliberate write concerns.

Beginner 14 min read Lesson 7 of 300 Challenge included

What you will be able to do

Use updateOne with a precise filter to avoid accidental mass updates.
Use $set and $unset rather than a full replacement.
Choose write concern based on durability requirements.

In plain English

Filters select documents; update operators change only named fields. Use $set instead of replacing a whole document when you mean to change one field. Write concern decides how durable a write must be before it is acknowledged.

crud.jsJavaScript

db.lessons.insertOne({ slug: "queries", minutes: 14 });

db.lessons.updateOne(
  { slug: "queries" },
  { $set: { published: true }, $inc: { version: 1 } }
);

db.lessons.deleteOne({ slug: "queries", published: false });

Your turn

Publish a lesson

Easy

Update the lesson with slug "queries" to published: true and increment its version by one.

JAVASCRIPT · starter

db.lessons.updateOne({ slug: "queries" }, {})

Check your understanding before moving on.

Knowledge checkQuestion 1

Which operator changes a single field without replacing the document?

Select an answer to continue

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Lesson 7 of 300 · 0% of course