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From Matteo Caprari <>
Subject Re: sample couchdb application
Date Thu, 07 Jan 2010 22:04:59 GMT
Hi Brian.

To make it short, I'm trying to write a sample couchapp trying to
capture some best practices. I started with using natural ids composed
by an embedded timestamp and the title of the document. I then
switched to server-generted uuids and a separate created_at field than
must be shared by 'master' and 'detail' documents.

The utc_random is good idea. Does it need to be configured at instance
level? If so, wouldn't it be a problem in distributed environment.

I'm also starting to appreciate the idea to use to use ids for
uniqueness enforcement only, if anything because there will be at
least one other sorting field (votes).


On Thu, Jan 7, 2010 at 8:55 PM, Brian Candler <> wrote:
> On Wed, Jan 06, 2010 at 01:42:56PM -0800, Chris Anderson wrote:
>> > emit([
>> >   doc.question_created_at,
>> >   doc.question_id,
>> >  (doc.question) ? 0 : 1], doc)
>> That's good. I hadn't thought of that.
>> One concern is clock drift between clients. Another is validating that
>> the client hasn't changed the question_created_at.
> But if you embed the created_at time within the doc's _id, then it can't be
> changed. So don't keep a created_at timestamp at all; just use
>  [uuids]
>  algorithm = utc_random
> Take the first 14 characters of the _id whenever you want to know the
> created_at time.
> I haven't been following the details of this thread, but if you have
> separate answer documents I think they can have a pointer to the
> question_id, which is naturally ordered by date using the utc_random uuid
> algorithm.

:Matteo Caprari

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