```dart
import 'package:amplify_flutter/amplify_flutter.dart';

import 'models/ModelProvider.dart';

Future<void> deletePostWithID123AndItsComments(String id) async {
  try {
    final post = (await Amplify.DataStore.query(
      Post.classType,
      where: Post.ID.eq(id),
    ))
        .first;

    // DataStore also deletes all associated comments with this operation
    await Amplify.DataStore.delete(post);
  } on DataStoreException catch (e) {
    safePrint('Something went wrong deleting models: ${e.message}');
  }
}
```