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From boazc <bcit...@gmail.com>
Subject Re: (Dynamically) excluding documents from a view query
Date Mon, 22 Oct 2012 11:22:11 GMT
I am playing with CouchDB-Lucene looking if it can fulfill my use-case.
I see that I can only index one document at a time, i.e. I cannot create an
index for each tag.
What will be the approach here? Should I concatenate tags or is an array
supported in Lucene?

Thanks!

On Tue, Oct 16, 2012 at 8:45 PM, Robert Newson-2 [via CouchDB Development] <
ml-node+s1959287n7581303h58@n2.nabble.com> wrote:

> I think that would require you to read the entire view every time, though.
>
> On 16 October 2012 10:53, boazc <[hidden email]<http://user/SendEmail.jtp?type=node&node=7581303&i=0>>
> wrote:
>
> > Thanks Robert.
> >
> > It crossed my mind that I can use List function and expect say
> include-keys
> > and exclude-keys query parameters thus filter out the undesired
> documents.
> > 1. Do you think the performance of such function will be reasonable?
> > 2. Can I still support pagination through a List function?
> >
> > Cheers.
> >
> > On Tue, Oct 16, 2012 at 3:30 PM, Robert Newson-2 [via CouchDB
> Development] <
> > [hidden email] <http://user/SendEmail.jtp?type=node&node=7581303&i=1>>
> wrote:
> >
> >> I can't speak about ElasticSearch, but the CouchDB-Lucene query would
> >> certainly reflect the current state of your database (i.e, no "delay")
> >> when you query.
> >>
> >> As for the original question, I don't think you can achieve it
> >> directly with CouchDB views. If you emit each tag of a document as a
> >> key, and null for value (e.g, emit("a",null)), then you could make two
> >> concurrent queries for ?key=a and ?key=b, and read each, row by row,
> >> filtering out as appropriate. It's not trivial.
> >>
> >> B.
> >>
> >> On 16 October 2012 05:50, boazc <[hidden email]<
> http://user/SendEmail.jtp?type=node&node=7581300&i=0>>
> >> wrote:
> >>
> >> > Hello,
> >> >
> >> > My documents contain tags which have a corresponding view.
> >> > I want to retrieve all documents that contain a certain tag, but
> don't
> >> > contain another one.
> >> > (Note that I don't know about the possible tags in advance).
> >> >
> >> > Example:
> >> > id: doc1, tags: [a, b]
> >> > id: doc2, tags: [b, c]
> >> > id: doc3, tags: [a, c]
> >> > If I want all docs with tag=a but not tag=b I expect to get only
> doc3.
> >> >
> >> > Is there a way to achieve this on CouchDB side?
> >> > Needless to say I cannot do it on the client side as I cannot benefit
> >> from
> >> > pagination and anyway might receive an extreme set of documents I
> need
> >> to
> >> > work on.
> >> >
> >> > I know I can turn to some search engines e.g. ElasticSearch or
> >> > CouchDB-Lucene, but other than introducing a new component to the
> system
> >> it
> >> > also means an inherent delay between the "real" data and the indexed
> >> data
> >> > which in my domain is unacceptable.
> >> >
> >> > Thanks!!
> >> >
> >> >
> >> >
> >> > --
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> >>
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