Add a "view" or "format" function to process source doc on query
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Key: COUCHDB-442
URL: https://issues.apache.org/jira/browse/COUCHDB-442
Project: CouchDB
Issue Type: Improvement
Components: JavaScript View Server
Reporter: Curt Arnold
It is common practice to emit pairs like {key, null} and then query with
?include_docs=true to retrieve the documents that were responsible for the
entries. However, the full document may include information that is privileged
or the full document may be substantially larger than the information needed to
be transferred to the client.
The proposed enhancement is to allow defining a "view" function in addition to
the existing "map" and "reduce" on a view. If specified, the view function
would take the id, key, value and doc and return a JSON value that would be
added as the "view" member to the row in the result set.
One of the use cases on
http://wiki.apache.org/couchdb/Authentication_and_Authorization is to be able
to specify that a user can retrieve the values from a view, but not add
include_docs since that may expose information that they are not authorized to
view. Without the "view" function, there would be pressure to start pushing
things into the emitted value.
Production of views would be likely controlled using a include_views=true in
the query string.
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