ObjectBox

lib/model/chat_message.dart

@@ -1,5 +1,5 @@
-import 'package:objectbox/objectbox.dart';
 import 'package:stadtbote/main.dart';
+import 'package:stadtbote/objectbox.g.dart';
 import 'package:stadtbote/tools/util.dart';
 
 @Entity()
@@ -7,6 +7,10 @@ class ChatMessage {
   @Id()
   int id = 0;
 
+  // External ID from server
+  @Unique()
+  late int externalId;
+
   late int time;
 
   late String from;
@@ -21,7 +25,8 @@ class ChatMessage {
 
   factory ChatMessage.fromJson(Map<String, dynamic> json) {
     final message = ChatMessage();
-    message.id = json['id'] as int? ?? 0;
+    message.id = 0; // Let ObjectBox assign the ID
+    message.externalId = json['id'] as int; // Store external ID separately
     message.time = json['time'] as int;
     message.from = json['from'] as String;
     message.subj = json['subj'] as String;
@@ -32,7 +37,7 @@ class ChatMessage {
 
   Map<String, dynamic> toJson() {
     return {
-      'id': id,
+      'id': externalId, // Use external ID for JSON
       'time': time,
       'from': from,
       'subj': subj,
@@ -42,10 +47,16 @@ class ChatMessage {
   }
 
   static Future<ChatMessage> mergeFromJson(Map<String, dynamic> json) async {
-    var availableMessage = MyApp.objectBoxStore.box<ChatMessage>().get(json["id"] as int);
+    final box = MyApp.objectBoxStore.box<ChatMessage>();
+    final externalId = json["id"] as int;
+
+    // Find message by external ID
+    final query = box.query(ChatMessage_.externalId.equals(externalId)).build();
+    var availableMessage = query.findFirst();
+    query.close();
 
     if (availableMessage != null) {
-      availableMessage.id = json["id"];
+      availableMessage.externalId = json["id"];
       availableMessage.time = json["time"];
       availableMessage.from = json["from"];
       availableMessage.subj = json["subj"];