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From "Paul Joseph Davis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (COUCHDB-442) Add a "view" or "format" function to process source doc on query
Date Wed, 29 Jul 2009 17:38:14 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12736723#action_12736723
] 

Paul Joseph Davis commented on COUCHDB-442:
-------------------------------------------

What reason is there for not just putting the extra data in the value? I can understand barring
include_docs=true for clients this extra functionality seems quite unnecessary.

> Add a "view" or "format" function to process source doc on query
> ----------------------------------------------------------------
>
>                 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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