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Date: Sun, 11 Dec 2011 14:08:33 +1100
From: Daniel Bryan <danbryan@gmail.com>
To: user@couchdb.apache.org
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Subject: Re: advice on how to get equal number of items of different
 types from db
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A show function is probably the immediate solution, but I'd also suggest =
thinking about why you're experiencing this problem in the first place:
is the data transmission with the whole document really that much=3F Is t=
his a security problem=3F
are you sure you aren't overestimating the overhead of doing several sepa=
rate AJAX requests=3F If you're requesting conceptually discrete things t=
hen this seems architecturally correct
if you really are going to have high volumes of GET requests for this dat=
a, maybe you should consider restructuring your data=3F Is it really corr=
ect for your application logic for it to be organised in this way=3F


On Saturday, 10 December 2011 at 3:48 AM, Zachary Zolton wrote:

> Bryan,
> =20
> The CouchDB way to get back three different types of data would be to
> make three view queries. If your problem is that it feels inelegant to
> deal with those asynchronous calls, then you should look into an
> asynchronous flow control library.
> =20
> Here are a couple options:
> =20
> jQuery Deferreds (in 1.5+)
> http://www.erichynds.com/jquery/using-deferreds-in-jquery/
> =20
> =46low-JS
> https://github.com/willconant/flow-js
> =20
> =20
> Cheers,
> =20
> Zach
> =20
> On =46ri, Dec 9, 2011 at 5:42 AM, Rogut=C3=ABs Sparnuotos
> <rogutes=40googlemail.com (mailto:rogutes=40googlemail.com)> wrote:
> > bryan rasmussen (2011-12-09 10:01):
> > > Hi,
> > > =20
> > > I have a db where items in the db are of different types, lets say
> > > type A, B, and C.
> > > There are a lot of items in the db, and I am returning 60 at a time=
 in
> > > my view. I could theoretically end up in a situation where my first=

> > > 1000+ results are of type A when what I want  is an even mix of typ=
e
> > > A,B and C.
> > > =20
> > > I could of course do a view for each type but this is problematic i=
n
> > > that my view is called at the application's load via Ajax, and I do=
n't
> > > want to send off 3 requests at that time.
> > > =20
> > > So what I want is a view or mapreduce or other Couchdb functionalit=
y
> > > that allows me to return a mix of my types=3F
> > > =20
> > > Any pointers, suggestions=3F
> > > =20
> > > Thanks,
> > > Bryan Rasmussen
> > > =20
> > =20
> > =20
> > I would be more worried about 3 separate views than about 3 requests
> > (especially when they are async).
> > =20
> > 1. Create one view like
> >     emit(=5Bdoc.type, doc.sort=5Fcriteria=5D, null)
> >   and query it like
> >     GET =3Fstartkey=3D=5B=22A=22=5D&endkey=3D=5B=22A=22, =7B=7D=5D&li=
mit=3D10
> >     GET =3Fstartkey=3D=5B=22B=22=5D&endkey=3D=5B=22B=22, =7B=7D=5D&li=
mit=3D10
> >     GET =3Fstartkey=3D=5B=22C=22=5D&endkey=3D=5B=22C=22, =7B=7D=5D&li=
mit=3D10
> > 2. Get everything client side and filter through.
> > 3. Make your documents help you. =46or example, if I needed to return=
 a
> >   matching triplet of A, B, C, I would keep an index or something:
> >     =7B=22type=22: =22A=22, =22typeindex=22: 1=7D
> >     =7B=22type=22: =22B=22, =22typeindex=22: 1=7D
> >     =7B=22type=22: =22C=22, =22typeindex=22: 1=7D
> >     =7B=22type=22: =22A=22, =22typeindex=22: 2=7D
> >   and in a view:
> >     emit(doc.typeindex + doc.type, null)
> > =20
> > --
> > --  Rogut=C3=ABs Sparnuotos
> > =20
> =20
> =20
> =20


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