backport: delegate IIIF Manifest cache key version to presenter #4419
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it turns out `etag` isn't a very good cache key because the default `SolrDocument` doesn't contain this data. using the system/Fedora `#modified_date` is equivalent (has the same weaknesses) but is available on both an actual work instance, and on its index proxy. since this is changing (and should likely change again!), delegate it to the presenter so there's a clear source going forward.
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changed the title
jeremyf
reviewed
Jul 10, 2020
| # @return [String] | ||
| def version_for(presenter) | ||
| presenter.etag | ||
| presenter.version |
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I like this explicit method name usage; Instead of relying on an implicit understanding of etag (which is reasonable but just a bit less clear).
jeremyf
approved these changes
Jul 10, 2020
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it turns out
etagisn't a very good cache key because the defaultSolrDocumentdoesn't contain this data. using the system/Fedora#modified_dateis equivalent (has the same weaknesses) but is available onboth an actual work instance, and on its index proxy.
since this is changing (and should likely change again!), delegate it to the
presenter so there's a clear source going forward.
backports #4418
@samvera/hyrax-code-reviewers