Feed stream with changenotifier

lib/services/feed_provider.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/material.dart';
+import 'package:maggs_victory_voyage/services/db_helper.dart';
+
+import '../models/feed_item.dart';
+
+class Feed extends ChangeNotifier {
+  final List<FeedItem> _feed = [];
+  Stream? feedStream;
+
+  List<FeedItem> get feed {
+    if (feedStream == null) {
+      DbHelper.fetchFeed().then((value) {
+        _feed.clear();
+        _feed.addAll(value);
+      });
+      feedStream = DbHelper.feedStream;
+      feedStream!.listen(
+        (event) => _updateFeed(event),
+      );
+    }
+    return _feed;
+  }
+
+  void _updateFeed(List<Map<String, dynamic>> data) {
+    final List<FeedItem> newFeed =
+        data.map((e) => FeedItem.fromMap(e)).toList();
+
+    final newItems =
+        newFeed.where((element) => !_feed.contains(element)).toList();
+
+    if (newItems.isNotEmpty) {
+      _feed.addAll(newItems);
+      notifyListeners();
+    }
+  }
+}