How to access data parameter value of ln.Artifact() constructor

[keller-mark]

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Hi,
Is there a way to access the value of the data parameter of the ln.Artifact constructor (Assuming the artifact was created using this constructor as opposed to from_df) if I only have a variable containing the resulting artifact instance?

I realize this is likely an anti-pattern which explains why there is not such a field listed in the public API docs at https://docs.lamin.ai/lamindb.artifact. However it would allow running VitessceConfig.widget() in a notebook such as https://github.com/laminlabs/lamin-spatial/blob/main/docs/vitessce.ipynb (for example, serving a local AnnData-Zarr directory on localhost to allow rendering the widget) prior to running save_vitessce_config or artifact.save(). If the data value is not available (for example, due to the artifact being fully remote or constructed via a different method such as from_df, or referencing a local directory that does not exist), Vitessce could throw an error that lets the user know this was the case.

[Koncopd]

Hi, i am not really sure what do you mean by accessing data parameter. What exactly should be in data?

[keller-mark]

h5ad_artifact = ln.Artifact(
    "./some_local_file.h5ad",
    key="some_key/some_local_file.h5ad",
    description="Some description",
    type="dataset",
)
h5ad_artifact.data == "./some_local_file.h5ad" # Would be True

Currently, as far as I understand, it is not possible to recover what the data value passed to the constructor was

[keller-mark]

Maybe .path is what I am looking for, but is this available pre-.save() ? Would it still reference the local data after that data had been uploaded to S3?

[Koncopd]

Before saving it is ._local_filepath. But after saving it doesn't have any reference to the original object. However the original object is copied to the cache anyways and can be accessed via ._cache_path. The remote object can be accessed via .path.

[keller-mark]

Great, that is what I was looking for, thank you!