SwiftUI - Simple Firestore Query - Display Results - firebase

Question

Ok, I'll preface this with the fact that I'm new to SwiftUI and programming. I'm a UX Designer. However, I'm trying to run a simple Firestore query and return the results to a list.
I've been able to write a function that writes the results to the console successfully, but I have no idea how to access the information that's within the function so that I can use it within the main view of the page.
I've started a simple view so that I can just focus on displaying Firestore data in a list. Here's my barebones code currently.
import SwiftUI
import FirebaseFirestore
struct FestivalListFB: View {
let db = Firestore.firestore()
func getVenues() {
let db = Firestore.firestore()
db.collectionGroup("Venues").getDocuments() {(querySnapshot, err) in
if let err = err {
print("Error getting documents \(err)")
} else {
for document in querySnapshot!.documents {
guard let venueEntry = document.get("venueTitle") as? String else {
continue
}
print(venueEntry)
}
}
}
}
var body: some View {
VStack {
List(0 ..<5) { item in
Text("Hello, World!")
}
}.onAppear(perform: getVenues)
}
}
Console displays:
"Refreshment Outpost
Holiday Sweets & Treats
Fife & Drum Tavern
L'Artisan des Glaces
Shi Wasu
...etc"
And of course, the body only displays "Hello World" 5 times within a list. How would I go about accessing the values in "venueEntry" so that I can display it within the list element?
I've included a image of my Firestore data structure as well. Ideally, I'd like to display the venues grouped by the "venueArea" they are located in.

Answer 1

For easier use, i created a model for you venue. See the below snippet how you can show your data in your View.
Your model:
class VenueObject: ObservableObject {
#Published var venueID: String
#Published var venueTitle: String
#Published var venueArea: String
init(id: String, title: String, area: String) {
venueID = id
venueTitle = title
venueArea = area
}
}
Your View:
struct FestivalListFB: View {
#State var data: [VenueObject] = []
let db = Firestore.firestore()
var body: some View {
VStack {
ForEach((self.data), id: \.self.venueID) { item in
Text("\(item.venueTitle)")
}
}.onAppear {
self.getVenues()
}
}
func getVenues() {
// Remove previously data to prevent duplicate data
self.data.removeAll()
self.db.collectionGroup("Venues").getDocuments() {(querySnapshot, err) in
if let err = err {
print("Error getting documents \(err)")
} else {
for document in querySnapshot!.documents {
let id = document.documentID
let title = document.get("venueTitle") as! String
let area = document.get("venueArea") as! String
self.data.append(VenueObject(id: id, title: title, area: area))
}
}
}
}
}