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https://issues.apache.org/jira/browse/COUCHDB-1303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13843214#comment-13843214
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Robert Newson commented on COUCHDB-1303:
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validate_doc_update runs on all updates. An update handler is just a function
that runs *before* a database update, the return value of the update handler
includes the update to be attempted. This is also why an update handler (for a
single document) can fail with a 409.
"all or nothing" cannot happen, we are not building a distributed transaction
engine. :)
> Add a _bulk_update handler similar to _update but for bulk document changes
> ---------------------------------------------------------------------------
>
> Key: COUCHDB-1303
> URL: https://issues.apache.org/jira/browse/COUCHDB-1303
> Project: CouchDB
> Issue Type: New Feature
> Reporter: Benjamin Young
> Labels: api, update_request_handler
>
> _update handlers are great (and getting better!) for building RESTful API's
> inside CouchDB. One limitation I found tonight is that _update can only do a
> single document at a time. If the API I'm building needs to update multiple
> docs (in a similar fashion to _bulk_docs), then an outside "proxy" script is
> required. It would be ideal to have a _bulk_update handler to allow for the
> same functionality as _update, but with the ability to insert multiple
> documents at once.
> Perhaps the current _update handler API could be extended to support multiple
> IDs/documents, but a separate API endpoint would be seem reasonable if needed.
> Thanks for considering this idea.
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