Update Nested Field in Embedded Document

MongoDB

Technical Specification

Update a user's address.city field without replacing the entire address object.

Input/Output Samples

Input:user email = a@b.com

Output:address.city updated

Optimal Logic Path

db.users.updateOne(
  { email: "happy@example.com" },
  { $set: { "address.city": "Delhi" } }
);

Architectural Deep-Dive

Dot notation lets you update deeply nested fields without overwriting other keys in the object.