How to use mongodb change streams

Question

How do I use the change stream approach to reference a collection or number of collections for a user.

Scenario similar to Facebook where friends news shows on your feed.

Answer 1

You can use mongo.watch(). It's available in mongo 4.0.

Read these docs:

https://docs.mongodb.com/manual/changeStreams/

https://docs.mongodb.com/manual/reference/method/Mongo.watch/#Mongo.watch

Answer 2

conn = new Mongo("mongodb://localhost:27017/demo?replicaSet=rs");
db = conn.getDB("demo");
collection = db.example;
const changeStreamCursor = collection.watch();

By using the parameterless watch() method, this change stream will signal every write to the example collection.

• https://www.mongodb.com/blog/post/an-introduction-to-change-streams
• https://docs.mongodb.com/manual/changeStreams/index.html#open-a-change-stream