hello team, Working on a kedro project (18.4) with omega conf, and when the pipeline is executed hitting the below error,

/home/hadoop/miniconda3/envs/mldev/lib/python3.8/site-packages/kedro/framework/cli/project.py:4 │
│ 53 in run                                                                                        │
│                                                                                                  │
│   450 │   with KedroSession.create(                                                              │
│   451 │   │   env=env, conf_source=conf_source, extra_params=params                              │
│   452 │   ) as session:                                                                          │
│ ❱ 453 │   │   session.run(                                                                       │
│   454 │   │   │   tags=tag,                                                                      │
│   455 │   │   │   runner=runner(is_async=is_async),                                              │
│   456 │   │   │   node_names=node_names,                                                         │
│                                                                                                  │
│ /home/hadoop/miniconda3/envs/mldev/lib/python3.8/site-packages/kedro/framework/session/session. │
│ py:418 in run                                                                                    │
│                                                                                                  │
│   415 │   │   │   "runner": getattr(runner, "__name__", str(runner)),                            │
│   416 │   │   }                                                                                  │
│   417 │   │                                                                                      │
│ ❱ 418 │   │   catalog = context._get_catalog(  # noqa: protected-access                          │
│   419 │   │   │   save_version=save_version,                                                     │
│   420 │   │   │   load_versions=load_versions,                                                   │
│   421 │   │   )                                                                                  │
│                                                                                                  │
│ /home/hadoop/miniconda3/envs/mldev/lib/python3.8/site-packages/kedro/framework/context/context. │
│ py:277 in _get_catalog                                                                           │
│                                                                                                  │
│   274 │   │   )                                                                                  │
│   275 │   │   conf_creds = self._get_config_credentials()                                        │
│   276 │   │                                                                                      │
│ ❱ 277 │   │   catalog = settings.DATA_CATALOG_CLASS.from_config(                                 │
│   278 │   │   │   catalog=conf_catalog,                                                          │
│   279 │   │   │   credentials=conf_creds,                                                        │
│   280 │   │   │   load_versions=load_versions,                                                   │
│                                                                                                  │
│ /home/hadoop/miniconda3/envs/mldev/lib/python3.8/site-packages/kedro/io/data_catalog.py:289 in  │
│ from_config                                                                                      │
│                                                                                                  │
│   286 │   │   layers: dict[str, set[str]] = defaultdict(set)                                     │
│   287 │   │                                                                                      │
│   288 │   │   for ds_name, ds_config in catalog.items():                                         │
│ ❱ 289 │   │   │   ds_config = _resolve_credentials(  # noqa: redefined-loop-name                 │
│   290 │   │   │   │   ds_config, credentials                                                     │
│   291 │   │   │   )                                                                              │
│   292 │   │   │   if cls._is_pattern(ds_name):                                                   │
│                                                                                                  │
│ /home/hadoop/miniconda3/envs/mldev/lib/python3.8/site-packages/kedro/io/data_catalog.py:87 in   │
│ _resolve_credentials                                                                             │
│                                                                                                  │
│    84 │   │   │   return {k: _map_value(k, v) for k, v in value.items()}                         │
│    85 │   │   return value                                                                       │
│    86 │                                                                                          │
│ ❱  87 │   return {k: _map_value(k, v) for k, v in config.items()}                                │
│    88                                                                                            │
│    89                                                                                            │
│    90 def _sub_nonword_chars(data_set_name: str) -> str:                                         │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
AttributeError: 'str' object has no attribute 'items'

Any help on why its hitting

What is the catalog looking like?

an example,

_data_source.int_pq: &int_pq
  type: spark.SparkDataSet
  layer: int
  file_format: parquet
  save_args:
    mode: overwrite


data_source.int_detail:
  <<: *int_pq
  filepath: ${base_path_spark}/detail

data_source.int_summary:
  <<: *int_pq
  filepath: ${base_path_spark}/summary

you probably forget to use

_

somewhere in the catalog

but there are a lot of them

Yep, the interpolation keys should begin with

_

in the catalog

aah ok ok got it

Actually - I am not sure if it works with YAML anchor (

<<

)if you are using OmegaConf, worth double checking because the preferred way to do so with OmegaConf is using interpolation.

Thanks for the help, the solution worked really well. and anchoring is working as well 🙂

Thanks for reporting! I didn't know that it works too!