如何为 await 和 async 覆盖 abstract class？

Question

如何覆盖 await 或 async？

存储库

abstract class Repository {
    Observable<dynamic> addUpdateWorkImage(WorkImage workImage);
}

RepositoryImpl

@override
  Future<Observable> addUpdateWorkImage(WorkImage workImage) async {
    if (workImage.id.isEmpty) {
      final StorageReference firebaseStorageRef =
          FirebaseStorage.instance.ref().child('image.jpg'.toString());
      final StorageUploadTask task =
          firebaseStorageRef.putFile(workImage.imagePath);
          StorageTaskSnapshot storageTaskSnapshot = await task.onComplete;
      workImage.url = await storageTaskSnapshot.ref.getDownloadURL();
      return Observable.fromFuture(
          endpoints.workImageCollectionEndpoint.add(workImage.toJson()));
    }
  }

错误

'RepositoryImpl.addUpdateWorkImage' ('(WorkImage) → Future<Observable<dynamic>>') isn't a valid override of 'Repository.addUpdateWorkImage' ('(WorkImage) → Observable<dynamic>').

Answer 1

将抽象接口更新为 return Future。

abstract class Repository {
    Future<Observable<dynamic>> addUpdateWorkImage(WorkImage workImage);
}