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  • shoyer · 1 ✖

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  • Stateful user-defined accessors · 1 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
525377722 https://github.com/pydata/xarray/issues/3268#issuecomment-525377722 https://api.github.com/repos/pydata/xarray/issues/3268 MDEyOklzc3VlQ29tbWVudDUyNTM3NzcyMg== shoyer 1217238 2019-08-27T16:22:44Z 2019-08-27T16:22:44Z MEMBER

It isn't just methods that use _to_temp_dataset() that result in losing the accessor state -- any operation that creates a new DataArray will (by design) lose the accessor, which don't get propagated in any operations.

Accessors are also not preserved when indexing a DataArray out of a Dataset (https://github.com/pydata/xarray/issues/3205), cc @djhoese.

I had not contemplated the issue of circular references, which I agree is not ideal. If we had realized that when creating accessors in the first place we might have chosen a different design, but there are a number of users who rely upon it.

The circular reference issue could also be worked around in a user-friendly way by having the decorator automatically add methods to the decorated class

I like the look of this solution. It will still require users to update their code to avoid circular references (e.g., by removing their own __init__ method), but it will make the default behavior more sane.

 
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   Stateful user-defined accessors 485708282

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