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https://issues.apache.org/jira/browse/COUCHDB-259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12674660#action_12674660
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Robert Newson commented on COUCHDB-259:
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My intention for storing the md5 with the attachment is to detect corruption
and to enable an enhancement to keep one copy of any attachment per database
(so-called 'single-instance store').
Doing something so cpu-intensive like md5 or sha1 in javascript never even
occured to me...
> Ability to store abitrary data in attachment stubs
> --------------------------------------------------
>
> Key: COUCHDB-259
> URL: https://issues.apache.org/jira/browse/COUCHDB-259
> Project: CouchDB
> Issue Type: Wish
> Components: Database Core
> Affects Versions: 0.8.1
> Reporter: Sho Fukamachi
> Priority: Minor
> Fix For: 0.8.1
>
>
> I suggest the ability to store arbitrary data in line with single attachments
> to a doc. The mooted use is to store metadata about that attachment.
> For example, a current attachment:
> m['_attachments']
> => {"yamanote.jpg"=>{"content_type"=>"image/jpeg", "stub"=>true,
> "length"=>382613}}
> Desired behaviour is to be able to insert persistent metadata like so:
> m['_attachments']
> => {"yamanote.jpg"=>{"content_type"=>"image/jpeg", "stub"=>true,
> "length"=>382613, "width" => 800, "height" => 600, "md5" =>
> "95de7a118ee28824afa8d2ad8fe5819f"}}
> And many other use cases according to media type.
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