Store Indetifiable struct array in Firestore - arrays

Question

I have this code:
struct Restaurants: Identifiable {
let name: String
let imageUrl: URL
let id: String
let rating: Double
let url: String
let category: String
static var viewModels: [Restaurants] = [
Restaurants(name: "Silverio's Mexican Kitchen", imageUrl: URL(string: "https://mainsite-prod-cdn.azureedge.net/partner-images/432257/micrositeimage_p1.jpg")!, id: "hjkhjhjh", rating: 2, url: "https://google.com"),//, category: "Mexican"),
Restaurants(name: "Taqueria La Esquinita", imageUrl: URL(string: "https://s3-media0.fl.yelpcdn.com/bphoto/x-KCQ7osmvBWLA9WpPdO_Q/o.jpg")!, id: "hjdha", rating: 3, url: "https://google.com")//, category: "Mexican")
] {
didSet {
print("data set")
}
}
}
How do I store viewModels in Firestore? I want to maintain this object structure so that I can carry it across multiple devices.
The idea of this app is to help groups find a place to eat. Therefore, I have this structure:
I am now using sub-collections for each Restaurant thanks to #FaridShumbar. How do I get documents from a sub-collection?

Answer 1

You need the get() method in order to retrieve documents.
Following examples from the documentation, you could retrieve your documents as follows:
db.collection("parties").getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
for document in querySnapshot!.documents {
print("\(document.documentID) => \(document.data())")
}
}
}
This example retrieves all documents in a collection.

Answer 2

I did it by saving each element in the struct separately and then putting it back together when I get the document.
Save Code:
db.collection("parties").document(Utilities.code).collection("Restaurants").document(card.name).setData([
"name" : card.name,
"img" : imgUrl,
"id" : card.id,
"rating" : card.rating,
"url" : card.url,
"yes" : FieldValue.arrayUnion([Utilities.name])
], merge: true) { error in
if error != nil {
print("error adding restaurant: \(error!)")
}
}
Retrieve code:
class restaurantsFirebase: ObservableObject {
#Published var restaurants: [RestaurantListViewModel] = []
private let db = Firestore.firestore()
private var devices = Array<String>()
func fetchData() {
db.collection("parties").document(Utilities.code).addSnapshotListener { doc, error in
if error == nil {
if doc != nil && doc!.exists {
if let getDevices = doc!.get("devices") as? Array<String> {
self.devices = getDevices
}
}
}
}
db.collection("parties").document(Utilities.code).collection("Restaurants").addSnapshotListener { (querySnapshot, error) in
guard let documents = querySnapshot?.documents else {
print("no documents")
return
}
self.restaurants = documents.compactMap({ (queryDocumentSnapshot) in
print(queryDocumentSnapshot.data())
let data = queryDocumentSnapshot.data()
let name = data["name"] as? String ?? ""
let img = data["img"] as? String ?? ""
let id = data["id"] as? String ?? ""
let rating = data["rating"] as? Double ?? 0
let url = data["url"] as? String ?? ""
let yes = data["yes"] as? Array<String> ?? []
let compiled = RestaurantListViewModel(name: name, imageUrl: URL(string: img)!, id: id, rating: rating, url: url)
print("restaurant = \(compiled), restaurants = \(self.restaurants)")
print("yes = \(yes), devices = \(self.devices)")
if yes == self.devices {
// self.restaurants.append(compiled)
return compiled
}else {
return nil
}
})
}
}
}
Use:
#ObservedObject private var viewModels = restaurantsFirebase()
db.collection("parties").document(Utilities.code).addSnapshotListener { doc, error in
if error == nil {
if doc != nil && doc!.exists {
if let dev = doc!.get("devices") as? Array<String> {
print("devices = \(dev)")
devices = dev
}
if let done = doc!.get("devicesDone") as? Array<String> {
print("devicesDone = \(done), devices = \(devices)")
if done == devices {
self.viewModels.fetchData()
showFinal = true
results = false
}
}
}
}