fix(llc): Fix UpsertPushPreferencesResponse null values parsing

packages/stream_chat/CHANGELOG.md

@@ -1,3 +1,9 @@
+## Upcoming
+
+🐞 Fixed
+
+- Fixed failing to parse `null` values in `UpsertPushPreferencesResponse.userPreferences` JSON.
+
 ## 9.25.0
 
 - Minor bug fixes and improvements

packages/stream_chat/lib/src/core/api/responses.dart

@@ -834,8 +834,11 @@ class GetUnreadCountResponse extends _BaseResponse {
 /// Model response for [StreamChatClient.setPushPreferences] api call
 @JsonSerializable(createToJson: false)
 class UpsertPushPreferencesResponse extends _BaseResponse {
-  /// Mapping of user IDs to their push preferences
-  @JsonKey(defaultValue: {})
+  /// Mapping of user IDs to their push preferences.
+  ///
+  /// Users whose user-global preferences were not touched by the upsert call
+  /// (the server returns `null` for them) are omitted from this map.
+  @JsonKey(fromJson: _userPreferencesFromJson)
   late Map<String, PushPreference> userPreferences;
 
   /// Mapping of user IDs to their channel-specific push preferences
@@ -846,3 +849,14 @@ class UpsertPushPreferencesResponse extends _BaseResponse {
   static UpsertPushPreferencesResponse fromJson(Map<String, dynamic> json) =>
       _$UpsertPushPreferencesResponseFromJson(json);
 }
+
+Map<String, PushPreference> _userPreferencesFromJson(
+  Map<String, dynamic>? json,
+) {
+  if (json == null) return {};
+  return {
+    for (final MapEntry(:key, :value) in json.entries)
+      if (value != null)
+        key: PushPreference.fromJson(value as Map<String, dynamic>),
+  };
+}

packages/stream_chat/test/src/core/api/responses_test.dart

@@ -4457,7 +4457,8 @@ void main() {
           },
           "user2": {
             "chat_level": "none"
-          }
+          },
+          "user3": null
         },
         "user_channel_preferences": {
           "user1": {
@@ -4482,7 +4483,10 @@ void main() {
       );
 
       expect(response.userPreferences, isA<Map<String, PushPreference>>());
+      // user3 had a `null` value in the response (no user-global prefs were
+      // touched by the upsert) — should be filtered outs.
       expect(response.userPreferences, hasLength(2));
+      expect(response.userPreferences.containsKey('user3'), isFalse);
 
       // Test user1 preferences
       final user1Prefs = response.userPreferences['user1']!;