Because the edges are unique on the subject->object there isn't currently a
way to capture the relationship. Aggregations can be rolled up on numeric
fields and as Yonik mentioned you can track the ancestor.
It would be fairly easy to track the relationship by adding a relationship
array that would correspond with the ancestors array for example:
{"result-set":{"docs":[
{"node":"Haruka","collection":"reviews","field":"user_s","ancestors":["book1"],
"relationships":["author"], "level":1},
{"node":"Maria","collection":"reviews","field":"user_s","
ancestors":["book2"], "relationships":["author"], "level":1},
{"EOF":true,"RESPONSE_TIME":22}]}}
Joel Bernstein
http://joelsolr.blogspot.com/
On Tue, Oct 25, 2016 at 6:26 PM, Yonik Seeley <ysee...@gmail.com> wrote:
> You can get the nodes that to came from by adding trackTraversal=true
>
> A cut'n'paste example from my Lucene/Solr Revolution slides:
>
> curl $URL -d 'expr=gatherNodes(reviews,
> search(reviews, q="user_s:Yonik AND rating_i:5",
> fl="book_s,user_s,rating_i",sort="user_s asc"),
> walk="book_s->book_s",
> gather="user_s",
> fq="rating_i:[4 TO *] -user_s:Yonik",
> trackTraversal=true )'
>
> {"result-set":{"docs":[
> {"node":"Haruka","collection":"reviews","field":"user_s","
> ancestors":["book1"],"level":1},
> {"node":"Maria","collection":"reviews","field":"user_s","
> ancestors":["book2"],"level":1},
> {"EOF":true,"RESPONSE_TIME":22}]}}
>
> -Yonik
>
>
> On Tue, Oct 25, 2016 at 5:57 PM, Grant Ingersoll <gsing...@apache.org>
> wrote:
> > Hi,
> >
> > I'm playing around with the new Graph Traversal/GatherNodes capabilities
> in
> > Solr 6. I've been indexing Yago facts (
> > http://www.mpi-inf.mpg.de/departments/databases-and-
> information-systems/research/yago-naga/yago/downloads/)
> > which give me triples of something like subject-relationship-object
> (United
> > States -> hasCapital -> Washington DC)
> >
> > My documents look like:
> > subject: string
> > relationship: string
> > object: string
> >
> > I can do a simple gatherNodes like
> > http://localhost:8983/solr/default/graph?expr=gatherNodes(default,
> > walk="United_States->subject", gather="object") and get back the objects
> > that relate to the subject. However, I don't see any way to capture what
> > the relationship is in the response. IOW, the request above would just
> > return a node of "Washington DC", but it doesn't tell me the relationship
> > (i.e. I'd like to get Wash DC and hasCapital back somehow). Is there
> > anyway to expand the "gather" or otherwise mark up the nodes returned
> with
> > additional field attributes or maybe get additional graph info back?
> >
> > Thanks,
> > Grant
>
