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https://issues.apache.org/jira/browse/COUCHDB-1721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13612132#comment-13612132
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Robert Newson commented on COUCHDB-1721:
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Unfortunately validate_doc_update functions are called before the attachments
are processed, we don't know how big they will be. Not sure this is fixable but
will leave it open for others to comment.
> attachment length is "undefined" in validate_doc_update but updates before
> first get
> ------------------------------------------------------------------------------------
>
> Key: COUCHDB-1721
> URL: https://issues.apache.org/jira/browse/COUCHDB-1721
> Project: CouchDB
> Issue Type: Bug
> Reporter: Quentin Raynaud
>
> I wanted to create a specific validate_doc_update preventing to add
> attachments bigger than a certain size to a document (to defeat possible
> abuses from users).
> The problem is: when I upload a document, if I log the value of
> newDoc._attachments.<filename>.length it reports "undefined".
> I believe this is a "bug" since if I use GET on the document just after it is
> updated with the attachment the length & digest are there. The
> validate_doc_update should always process the same data that will be served
> by CouchDB if it does not deny the update.
> NB: I uploaded the attachments using the Futon interface during my tests on
> the subject
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