From 28509d16926894a9164d73bfd6afe0800b4f81da Mon Sep 17 00:00:00 2001
From: Drew McCormack <drewmccormack@mac.com>
Date: Wed, 25 Dec 2024 22:55:33 +0700
Subject: [PATCH] Added alert if a sync detected an unknown model version.

---
 Samples/Forkers/Forkers/Models/Store.swift      | 11 +++++++++--
 Samples/Forkers/Forkers/Views/ContentView.swift |  6 ++++++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/Samples/Forkers/Forkers/Models/Store.swift b/Samples/Forkers/Forkers/Models/Store.swift
index 97cd713d..54f23f1b 100644
--- a/Samples/Forkers/Forkers/Models/Store.swift
+++ b/Samples/Forkers/Forkers/Models/Store.swift
@@ -26,7 +26,7 @@ class Store {
     private typealias RepoType = AtomicRepository<Forkers>
     private let repo: RepoType
     private let forkedModel: ForkedResource<RepoType>
-    private let cloudKitExchange: CloudKitExchange<RepoType>
+    private var cloudKitExchange: CloudKitExchange<RepoType>!
     
     private static let repoDirURL: URL = FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first!
     private static let repoFileURL: URL = repoDirURL.appendingPathComponent("Forkers.json")
@@ -52,6 +52,8 @@ class Store {
         }
     }
     
+    var showUpgradeAlert = false
+    
     init() throws {
         // Reads repo from disk if it exists, otherwise creates it anew
         repo = try AtomicRepository(managedFileURL: Self.repoFileURL)
@@ -72,7 +74,12 @@ class Store {
         try forkedModel.syncMain(with: [.ui, .editingForker])
         
         // Setup CloudKitExchange
-        cloudKitExchange = try .init(id: "Forkers", forkedResource: forkedModel)
+        cloudKitExchange = try .init(id: "Forkers",
+            forkedResource: forkedModel,
+            unknownModelVersionHandler: { [weak self] error in
+                self?.showUpgradeAlert = true
+            }
+        )
         
         // Set displayed forkers to what is in the repo
         displayedForkers = uiForkers
diff --git a/Samples/Forkers/Forkers/Views/ContentView.swift b/Samples/Forkers/Forkers/Views/ContentView.swift
index 51084f91..4a940953 100644
--- a/Samples/Forkers/Forkers/Views/ContentView.swift
+++ b/Samples/Forkers/Forkers/Views/ContentView.swift
@@ -5,6 +5,7 @@ struct ContentView: View {
     @State var editorConfig = EditorConfig()
     
     var body: some View {
+        @Bindable var store = store
         NavigationStack {
             List {
                 ForEach(store.displayedForkers) { forker in
@@ -63,6 +64,11 @@ struct ContentView: View {
                         }
                 }
             }
+            .alert("Update Required", isPresented: $store.showUpgradeAlert) {
+                Button("OK", role: .cancel) { }
+            } message: {
+                Text("Please upgrade to the latest version of the app to continue syncing.")
+            }
         }
     }
 }