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// ONE-TO-FEW — embed comments inside the blog post db.posts.insertOne({ _id: ObjectId("post1"), title: "MongoDB Schema Design", // Comments are small in number and always accessed with the post comments: [ { author: "Alice", text: "Great post!", date: new Date() }, { author: "Bob", text: "Very helpful.", date: new Date() } ] }) // ONE-TO-MANY — reference the parent from the child db.orders.insertOne({ _id: ObjectId("order1"), userId: ObjectId("user1"), // reference back to users collection total: 129.99, status: "pending" }) // Fetch all orders for a user db.orders.find({ userId: ObjectId("user1") }) // ONE-TO-SQUILLIONS — reference parent from the many side db.logs.insertOne({ _id: ObjectId(), serverId: ObjectId("server1"), // reference, not embedded level: "error", message: "Disk usage at 95%", timestamp: new Date() })
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