Avoiding updating a doc's _rev if nothing changed
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Key: COUCHDB-529
URL: https://issues.apache.org/jira/browse/COUCHDB-529
Project: CouchDB
Issue Type: New Feature
Components: Database Core
Reporter: Matt Goodall
Would it be possible for CouchDB to use its deterministic rev algorithm to
avoid writing changes to the database if nothing has actually changed in the
doc that is sent for update.
The most obvious use case is the user who clicks an HTML form's submit button,
instead of using the back button, when they haven't changed anything. I suspect
most applications do not check if the user made any changes and therefore end
up sending exactly the same data back as an update ... unnecessarily creating a
new document rev, growing the database, invalidating views, triggering _changes
updates, etc.
If CouchDB could determine that the new document is the same as the old
document then it could avoid writing to disc and return the current _rev in the
response.
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