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# ask-community
t

Terry Lines

04/05/2023, 10:45 PM
A question about
@observable_source_assets
and the
observe_fn
. I want the observation function to be a method of the io_manager (to return the file modified timestamp or a hash etc ). How do I access the io_manager of the source asset from within the observation_function? SourceAssets don't appear to support required_resource_keys in order to allow this.
Thanks.
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