couchdb-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Mike Bannister <mikebannis...@gmail.com>
Subject Re: First doc in a group?
Date Thu, 11 Nov 2010 23:29:29 GMT
Cool, I understand now reduce isn't right, initially posted to the list
because I couldn't decide that on my own.

So what's the most efficient way to get the latest document for each user?
Seems like I shouldn't have to do one query per user but I'm open minded (:

-Mike



On Thu, Nov 11, 2010 at 5:52 PM, Chad George <chad@mgproducts.com> wrote:

> Selecting one row in a view out of many possible isn't what reduce is for.
>
> I try not to think of it as reducing a set of view results to a smaller set
> but rather reducing each and every entry in the view to something smaller.
>
> The fact that reduce gets multiple view rows to work on at once is just an
> optimization. I think its better to think of reduce as working on exactly
> one view row at a time then rereduce the result to get final answer.
> On Nov 11, 2010 5:22 PM, "Mike Bannister" <mikebannister@gmail.com> wrote:
> > Cory, cool thanks. Wasn't able to decide on my own if reducing was OK for
> > this kind of thing.
> >
> > Robert, but I need one document for each user, wouldn't that be a summary
> of
> > sorts?
> >
> > -Mike
> >
> >
> > On Nov 11, 2010 4:46 PM, "Cory Zue" <czue@dimagi.com> wrote:
> >
> > You could emit the users as keys, and in your reduce function just
> > return the latest by date.
> >
> >
> > On Thu, Nov 11, 2010 at 4:35 PM, Mike Bannister <mikebannister@gmail.com
> >
> > wrote:
> >> Yeah, I'm trying...
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message