[Neo] Relation properties

Anton Popov popov.UA.work at gmail.com
Fri Jan 29 15:02:09 CET 2010


Hello Mattias,

Got it. Thanks.
Is there any RoadMap available?

2010/1/29 Mattias Persson <mattias at neotechnology.com>

> Unfortunately you cannot index Relationships, but it's a (frquently
> requested) feature we're planning to add.
>
> 2010/1/29 Anton Popov <popov.UA.work at gmail.com>:
> > Hello everybody,
> >
> > A related question is can I index both Nodes & Relations?
> > As I can see LuceneIndexBatchInserter.index( long node, String key,
> Object
> > value ) applies for Nodes only.
> >
> > 2010/1/28 Mattias Persson <mattias at neotechnology.com>
> >
> >> Not at all, you're not the first one to overlook that inheritance!
> >>
> >> 2010/1/28, Anton Popov <popov.UA.work at gmail.com>:
> >> > Thanks for a quick answer, Mattias.
> >> >
> >> > Sorry for a stupid questions, just haven't noticed the inheritance of
> >> > Relationship interface.
> >> >
> >> > On 28 January 2010 19:43, Mattias Persson <mattias at neotechnology.com>
> >> wrote:
> >> >
> >> >> Relationship has all the property methods, just like Node... they're
> >> >> actually on PropertyContainer (a common super interface to Node and
> >> >> Relationship) see
> >> >> http://api.neo4j.org/current/org/neo4j/graphdb/Relationship.html and
> >> >>
> http://api.neo4j.org/current/org/neo4j/graphdb/PropertyContainer.html
> >> >> for more information.
> >> >>
> >> >> So to manage the cost in a dijkstra algorithm you can use whatever
> >> >> property key, f.ex. "weight", like this:
> >> >>
> >> >>    Relationship rel = ... // any relationship
> >> >>    rel.setProperty( "weight", 4 );
> >> >>
> >> >> And if you're using the Dijkstra algorithms in the "neo4j-graph-algo"
> >> >> component, http://components.neo4j.org/neo4j-graph-algo/ , you can
> >> >> instantiate it with a CostEvaluator instance something like this:
> >> >>
> >> >>    new CostEvaluator<Integer>()
> >> >>    {
> >> >>        CostType getCost( Relationship relationship, boolean backwards
> )
> >> >>        {
> >> >>            / TODO Handle backwards flag?
> >> >>            return ( Integer ) relationship.getProperty( "weight", 1
> );
> >> >>        }
> >> >>    }
> >> >>
> >> >> ...and pass it to your Dijkstra algo instance.
> >> >>
> >> >> Is this what you were looking for?
> >> >>
> >> >> 2010/1/28 Anton Popov <popov.UA.work at gmail.com>:
> >> >> > Hello everyone,
> >> >> >
> >> >> > Is there any possibility to assign properties to Relations?
> >> >> > The matter is I want to try Dijkstra algorithm performance on some
> >> >> weighted
> >> >> > directed graph and don't know where to put weight actually...
> >> >> >
> >> >> > --
> >> >> > Best regards,
> >> >> > Popov Anton
> >> >> > _______________________________________________
> >> >> > Neo mailing list
> >> >> > User at lists.neo4j.org
> >> >> > https://lists.neo4j.org/mailman/listinfo/user
> >> >> >
> >> >>
> >> >>
> >> >>
> >> >> --
> >> >> Mattias Persson, [mattias at neotechnology.com]
> >> >> Neo Technology, www.neotechnology.com
> >> >> _______________________________________________
> >> >> Neo mailing list
> >> >> User at lists.neo4j.org
> >> >> https://lists.neo4j.org/mailman/listinfo/user
> >> >>
> >> >
> >> >
> >> >
> >> > --
> >> > Best regards,
> >> > Popov Anton
> >> > _______________________________________________
> >> > Neo mailing list
> >> > User at lists.neo4j.org
> >> > https://lists.neo4j.org/mailman/listinfo/user
> >> >
> >>
> >>
> >> --
> >> Mattias Persson, [mattias at neotechnology.com]
> >> Neo Technology, www.neotechnology.com
> >> _______________________________________________
> >> Neo mailing list
> >> User at lists.neo4j.org
> >> https://lists.neo4j.org/mailman/listinfo/user
> >>
> >
> >
> >
> > --
> > Best regards,
> > Popov Anton
> > _______________________________________________
> > Neo mailing list
> > User at lists.neo4j.org
> > https://lists.neo4j.org/mailman/listinfo/user
> >
>
>
>
> --
> Mattias Persson, [mattias at neotechnology.com]
> Neo Technology, www.neotechnology.com
> _______________________________________________
> Neo mailing list
> User at lists.neo4j.org
> https://lists.neo4j.org/mailman/listinfo/user
>



-- 
Best regards,
Popov Anton


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