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From Mike Fedyk <mfe...@mikefedyk.com>
Subject Re: Allowing specific field value updates only
Date Wed, 17 Nov 2010 21:12:46 GMT
On Wed, Nov 17, 2010 at 4:02 AM, Wordit Ltd <wordituk@googlemail.com> wrote:
> On Tue, Nov 16, 2010 at 10:01 PM, Jan Lehnardt <jan@apache.org> wrote:
>>
>>  function(newDoc, oldDoc, userCtX) {
>>    if(userCtx.roles.indexOf("_admin") == -1) { // not an admin
>>      if(newDoc.field > oldDoc.field) { // your condition is this
>>        throw({forbidden : message});
>> ...
>
> Many Thanks. Aha! So this is what oldDoc is good for :-)
> I'm new to CouchDB and could not find a reason to specify oldDoc.
>
> I couldn't figure out how to pass the new value, being in a variable,
> to the validation function. From this example I see that CouchDB has
> both old and new fields internally which can be accessed via oldDoc
> and newDoc. It seems obvious now, but although I've read the docs and
> book chapters on the subject it was not clear what was happening.
>
> Some examples in the CouchDB book and docs, like this using oldDoc and
> newDoc fields would be helpful to newbies.
>

Kinda late now, but maybe it should be called "currentDoc".
Especially since you're possibly rejecting the newDoc, it just may not
be old anymore. ;)

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