Why do you need to set your own ID's? You can use the relationship's built-in as your index key (it is guaranteed to be unique) and getRelationshipByID to retrieve the relationship. You'd need to very slightly extend the LuceneIndex stuff to deal with relationships, but it shouldn't be difficult.
-----Original Message----- From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On Behalf Of Anton Popov Sent: Friday, January 29, 2010 9:31 AM To: Neo user discussions Subject: Re: [Neo] Relation properties And as far as I can see there is no way to set my own id'es for Relations? Only Nodes has such functionality - am I right? ---------- Forwarded message ---------- From: Anton Popov <popov.ua.w...@gmail.com> Date: 2010/1/29 Subject: Re: [Neo] Relation properties To: Neo user discussions <user@lists.neo4j.org> Hello Mattias, Got it. Thanks. Is there any RoadMap available? 2010/1/29 Mattias Persson <matt...@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.w...@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 <matt...@neotechnology.com> > > > >> Not at all, you're not the first one to overlook that inheritance! > >> > >> 2010/1/28, Anton Popov <popov.ua.w...@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 <matt...@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.w...@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@lists.neo4j.org > >> >> > https://lists.neo4j.org/mailman/listinfo/user > >> >> > > >> >> > >> >> > >> >> > >> >> -- > >> >> Mattias Persson, [matt...@neotechnology.com] > >> >> Neo Technology, www.neotechnology.com > >> >> _______________________________________________ > >> >> Neo mailing list > >> >> User@lists.neo4j.org > >> >> https://lists.neo4j.org/mailman/listinfo/user > >> >> > >> > > >> > > >> > > >> > -- > >> > Best regards, > >> > Popov Anton > >> > _______________________________________________ > >> > Neo mailing list > >> > User@lists.neo4j.org > >> > https://lists.neo4j.org/mailman/listinfo/user > >> > > >> > >> > >> -- > >> Mattias Persson, [matt...@neotechnology.com] > >> Neo Technology, www.neotechnology.com > >> _______________________________________________ > >> Neo mailing list > >> User@lists.neo4j.org > >> https://lists.neo4j.org/mailman/listinfo/user > >> > > > > > > > > -- > > Best regards, > > Popov Anton > > _______________________________________________ > > Neo mailing list > > User@lists.neo4j.org > > https://lists.neo4j.org/mailman/listinfo/user > > > > > > -- > Mattias Persson, [matt...@neotechnology.com] > Neo Technology, www.neotechnology.com > _______________________________________________ > Neo mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > -- Best regards, Popov Anton -- Best regards, Popov Anton _______________________________________________ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user _______________________________________________ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
