Below, you query for an instance with an `id` of `123`, and then delete it, if found:

```dart
Future<void> deletePostsWithId() async {
  final oldPosts = await Amplify.DataStore.query(
    Post.classType,
    where: Post.ID.eq('123'),
  );
  // Query can return more than one posts with a different predicate
  // For this example, it is ensured that it will return one post
  final oldPost = oldPosts.first;
  try {
    await Amplify.DataStore.delete(oldPost);
    print('Deleted a post');
  } on DataStoreException catch (e) {
    print('Delete failed: $e');
  }
}
```