mongoose express node JS link two collection without using _id

Question

hello I have two collection one called room and second called booking I have RoomID as a attribute and I want to link room id as a primary key from collection room with RoomID in collection booking in mongoose with express and node JS one room has many booking...?

Answer 1

There is nothing such concept of Primary Key in mongodb (mongoose) but in Relational Databases like: MySQL, PGSQL and so on.

Even if you want to do so, you can use that in find operation simply like:

const bookings = await BookingModel.find({RoomID: inputRoomID});

This way you can get bookings for a simple room with inputRoomID and If you want to go further ie bookings for all rooms, go for aggregation in mongoose.