Batch sync news resources from remote

Batch sync news resources from remote to reduce json payload size.

core/data/src/main/java/com/google/samples/apps/nowinandroid/core/data/repository/OfflineFirstNewsRepository.kt

@@ -34,6 +34,8 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
 import javax.inject.Inject
 
+private const val SYNC_BATCH_SIZE = 40
+
 /**
  * Disk storage backed implementation of the [NewsRepository].
  * Reads are exclusively from local storage to support offline access.
@@ -65,7 +67,8 @@ class OfflineFirstNewsRepository @Inject constructor(
             },
             modelDeleter = newsResourceDao::deleteNewsResources,
             modelUpdater = { changedIds ->
-                val networkNewsResources = network.getNewsResources(ids = changedIds)
+                changedIds.chunked(SYNC_BATCH_SIZE).forEach { chunkedIds
+                    val networkNewsResources = network.getNewsResources(ids = chunkedIds)
 
                     // Order of invocation matters to satisfy id and foreign key constraints!
 
@@ -76,8 +79,9 @@ class OfflineFirstNewsRepository @Inject constructor(
                             .distinctBy(TopicEntity::id),
                     )
                     newsResourceDao.upsertNewsResources(
-                    newsResourceEntities = networkNewsResources
+                        newsResourceEntities = networkNewsResources.map(
-                        .map(NetworkNewsResource::asEntity),
+                            NetworkNewsResource::asEntity
+                        ),
                     )
                     newsResourceDao.insertOrIgnoreTopicCrossRefEntities(
                         newsResourceTopicCrossReferences = networkNewsResources
@@ -85,6 +89,7 @@ class OfflineFirstNewsRepository @Inject constructor(
                             .distinct()
                             .flatten(),
                     )
+                }
             },
         )
 }