How can I create Subcollection in document?

Question

I want to create under every Restaurant document empty Subcollection where I will be adding new reservations. All Restaurant documents are in Restaurants collection.

let \_ = Firestore.firestore().collection("Restaurants").document(userUID).setData(\[
"userName": userName,
"userEmail": email,
"maxSittingPlaces": sittingplaces,
"description": description,
"openingHours": openingHours,
"adress": adress,
"phoneNumber": phone,
"actualSittingPlaces": sittingplaces,
"imageURL:,": imgURL.self\])

                    let _ = 

-->  Firestore.firestore().collection("Restaurants").document(userUID).collection("Reservations")

I don' know how to write command to create Subcollection Reservations in every document Reservation.

Answer 1

In firebase, The collection wont be created unless you write something to it. So remember to write something in the collection you just created.Here's the code for it.

let reservationRef = Firestore.firestore().collection("Restaurants").document(userUID).collection("Reservations")

let reservationData = [  "userName": userName,  "userEmail": email]

reservationRef.addDocument(data: reservationData)

Happy Coding:)