stream-chat-android-client/src/main/java/io/getstream/chat/android/client/api2/MoshiChatApi.kt (1)

1570-1583: 🚀 Performance & Scalability | 🔵 Trivial | 💤 Low value

Map each grouped channel state once.

toChannelsCall first maps every state through flattenChannelState to validate it. It then discards that result. Each group then maps the same states again with mapNotNull(::flattenChannelState). This doubles the mapping work for messages, members, and reads, and it runs the channel and message transformers twice for each channel. Validate the states first, then build the groups from the mapped channels.

♻️ Proposed refactor

-            ).flatMapDomain { response ->
-                response.groups.values.flatMap { it.channels }.toChannelsCall {
-                    GroupedChannels(
-                        groups = response.groups.mapValues { entry ->
-                            GroupedChannelsGroup(
-                                groupKey = entry.key,
-                                channels = entry.value.channels.mapNotNull(::flattenChannelState),
+            ).flatMapDomain { response ->
+                val mapped = response.groups.mapValues { (_, bucket) -> bucket.channels.mapNotNull(::flattenChannelState) }
+                if (response.groups.any { (key, bucket) -> mapped.getValue(key).size != bucket.channels.size }) {
+                    ErrorCall(coroutineScope, Error.GenericError("A channel state in the response carried no channel"))
+                } else CoroutineCall(coroutineScope) {
+                    Result.Success(GroupedChannels(
+                        groups = response.groups.mapValues { entry ->
+                            GroupedChannelsGroup(
+                                groupKey = entry.key,
+                                channels = mapped.getValue(entry.key),

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Review comment at
@stream-chat-android-client/src/main/java/io/getstream/chat/android/client/api2/MoshiChatApi.kt
around lines 1570 - 1583:
Update the grouped-channel mapping in the flatMapDomain flow to reuse each
result of flattenChannelState instead of mapping channel states again when
building groups. Preserve toChannelsCall’s validation behavior by checking that
every state maps successfully, then populate GroupedChannelsGroup.channels from
the validated mapped results.

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