If I understand you correctly, then your start nodes (aka "UserGroup 2") would be dangling as there is no relationship IS_MEMBER_OF starting from this group.
so your start nodes are connected by an optional relationship, so everything also hanging on this optional relationship is also optional. What would you expect when starting with "UserGroup 2" ? Probably it is mixing two use-cases ? First one starting from the leaf-nodes like users > MATCH (principals)-[:IS_MEMBER_OF]->()<-[:IS_MEMBER_OF*0..]-(n) and a second one starting from higher level nodes like groups. > MATCH (principals)<-[:IS_MEMBER_OF*0..]-(n) So that is a different place for the starting points in the match. Perhaps something like this could work: > MATCH (principals)-[:IS_MEMBER_OF*0..1]->()<-[:IS_MEMBER_OF*0..]-(n) But perhaps better when Peter chimes in later today as he spent a lot of time applying Cypher to ACL scenarios. Michael Am 02.11.2011 um 11:18 schrieb D. Frej: > I though that this is what I used with > MATCH (principals)-[?:IS_MEMBER_OF]-> > > When I turn it into > MATCH (principals)-[?]->()<-[:IS_MEMBER_OF*0..]-(n) > RETURN n > > Nothing at all is returned > > > > > Am 02.11.2011 11:05, schrieb Jacob Hansson: >> On Wed, Nov 2, 2011 at 11:01 AM, D. Frej<[email protected]> wrote: >> >>> Hi, >>> >>> I have a very simply graph: >>> >>> UserGroup 2<-[:IS_MEMBER_OF]- UserGroup 1, User 3 >>> UserGroup 1<-[:IS_MEMBER_OF]- User 1, User 2 >>> >>> I want to find all nodes that are on the same level or on a level below >>> the starting point. Using >>> >>> START principals=node:nodes(NAME='User 3') >>> MATCH (principals)-[?:IS_MEMBER_OF]->()<-[:IS_MEMBER_OF*0..]-(n)" >>> RETURN n >>> >>> I first go one level up and then determine all nodes below this level. >>> However, it is not working if I change the start to >>> >>> START principals=node:nodes(NAME='UserGroup 2') >>> (because there is no IS_MEMBER_OF relationship to go up). >>> >>> Is there a way to ommit this condition if it is not available? To make >>> it somehow optional? >>> >> You could use an optional relationship here. See: >> >> http://docs.neo4j.org/chunked/snapshot/query-match.html#match-optional-relationship >> >> Note that this is the snapshot version of the documentation, you will want >> to look at the documentation for the version of neo4j you are using to make >> sure that this syntax is supported. >> >> >>> Thanks, >>> >>> - Didi >>> _______________________________________________ >>> Neo4j mailing list >>> [email protected] >>> https://lists.neo4j.org/mailman/listinfo/user >>> >> >> > > _______________________________________________ > Neo4j mailing list > [email protected] > https://lists.neo4j.org/mailman/listinfo/user _______________________________________________ Neo4j mailing list [email protected] https://lists.neo4j.org/mailman/listinfo/user
