Trabalhando com o padrão de coleção única do MongoDB em Swift

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{ _id: 'basket1', docType: 'basket', customer: 'cust101' }
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{ _id: 'basket1-item1', docType: 'item', name: 'Fish', quantity: 5 }
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{ _id: 'basket1-item2', docType: 'item', name: 'Chips', quantity: 3 }

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@State private var docs = [BSONDocument]()

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List(docs, id: \.hashValue) { doc in
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    if path.dbName == "Single" && path.collectionName == "Collection" {      
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        if let docType = doc["docType"] {
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            switch docType {
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            case "basket":
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                if let basket = basket(doc: doc) {
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                    BasketView(basket: basket)
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                }
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            case "item":
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                if let item = item(doc: doc) {
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                    ItemView(item: item)
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                }
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            default:
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                Text("Unknown doc type")
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            }
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        }
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    } else {
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        JSONView(doc: doc)
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    }
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}

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struct Basket: Codable {
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    let _id: String
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    let docType: String
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    let customer: String
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    init(doc: BSONDocument) {
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        do {
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            self = try BSONDecoder().decode(Basket.self, from: doc)
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        } catch {
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            _id = "n/a"
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            docType = "basket"
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            customer = "n/a"
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            print("Failed to convert BSON to a Basket: \(error.localizedDescription)")
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        }
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    }
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}

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struct Item: Codable {
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    let _id: String
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    let docType: String
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    let name: String
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    let quantity: Int
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    init(doc: BSONDocument) {
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        do {
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            self = try BSONDecoder().decode(Item.self, from: doc)
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        } catch {
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            _id = "n/a"
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            docType = "item"
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            name = "n/a"
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            quantity = 0
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            print("Failed to convert BSON to a Item: \(error.localizedDescription)")
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        }
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    }
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}

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struct BasketView: View {
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    let basket: Basket
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    var body: some View {
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        VStack {
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            Text("Basket")
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                .font(.title)
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            Text("Order number: \(basket._id)")
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            Text("Customer: \(basket.customer)")
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        }
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        .padding()
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        .background(.secondary)
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        .clipShape(RoundedRectangle(cornerRadius: 15.0))
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    }
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}

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struct ItemView: View {
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    let item: Item
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    var body: some View {
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        VStack {
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            Text("Item")
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                .font(.title)
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            Text("Item name: \(item.name)")
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            Text("Quantity: \(item.quantity)")
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        }
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        .padding()
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        .background(.secondary)
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        .clipShape(RoundedRectangle(cornerRadius: 15.0))
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    }
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}