How would I go about retrieving all nodes for a certain relationship Type (ie. assuming I don't know any of them nodes) ? (in java code, the other variants rest/cypher I will probably not need to use) ie. rel.getAllNodes(Direction.INCOMING) or rel.getAllNodes(Direction.OUTGOING) or Direction.BOTH even But this is basically equivalent with retrieving all relationships that are of the specified relationship-type. So this would be more accurate: rel.getAllRelationships(); where rel is the Relationship of the type that we want and the getAllRelationships() would return something that would be a list of all relationship of that type (in the entire database I guess)
but possibly _*without*_ having to iterate (or traverse?) all nodes(i guess starting from the reference node?), in order to find if each has the relationship type I'm looking for. (I haven't yet fully looked at traverse but I know it needs a starting node, even though this could probably be the reference node[?]; this makes me wonder if there's a traverser for relationships instead of just nodes - I am unsure where to look [maybe just pointing me there would be enough of a reply to this; thanks]) The way I see it, the fact that relationships have a type is an extra layer on top of the relationships (just as indexing is extra(independent) layer on top of nodes or relationships). So I see the relationships each being unique (especially since I can add the same-type relationship to the same two nodes, more than 1 time) and they are somehow coalesced together via the relationship-type. It's like the relationship-type is a set which contains a bunch of relationships (which are obviously unique ie. unique ID) and this set constitutes a relationship-type. So since it's a set (probably stored as key-value pairs on the low level) one could potentially just get the elements via an iterator or something (but I also want to know how many aka size or count, relationships are there, of this type). (what I find a bit odd though, is that you can have more than one relationship for the same two nodes (1: A->B ; 2: A->B ), although dwins(on irc) implied that this is allowed because each relationship can have key-value pairs(properties) associated with it, and thus one could use same key for each relationship but with different values, but the practicality for this escapes me) _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user