I'll strongly +1 that having a concept of "unique" index values should be built into Neo4j. It's just too common of a requirement.
Aseem On Thu, Jul 7, 2011 at 11:48 AM, etc3 <e...@nextideapartners.com> wrote: > I'm new to this framework, is there an example that demonstrates removing a > non-existent property and how it would be used in this context? > > Thanks > > -----Original Message----- > From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] > On > Behalf Of Chris Gioran > Sent: Thursday, July 07, 2011 11:04 AM > To: Neo4j user discussions > Subject: Re: [Neo4j] Unique Constaint on Index > > Hi, > > the ability to acquire locks cluster-wide exists, albeit in an ad hoc > fashion. Grabbing a write lock on the node you want to ensure is uniquely > indexed will ensure that the operations are serialized across all cluster > members. > The most simple way to get that lock currently is the (somewhat hackish but > entirely correct) removal of a non-existing property. > > cheers, > CG > > On Thu, Jul 7, 2011 at 5:53 PM, etc3 <e...@nextideapartners.com> wrote: > > How do I ensure another request is not performing the same operation > > on another node in the cluster? > > > > > > -----Original Message----- > > From: user-boun...@lists.neo4j.org > > [mailto:user-boun...@lists.neo4j.org] On Behalf Of Marko Rodriguez > > Sent: Thursday, July 07, 2011 10:35 AM > > To: Neo4j user discussions > > Subject: Re: [Neo4j] Unique Constaint on Index > > > > Hi, > > > >> We are testing Neo4J and need to support unique emails across all > >> users. Is this possible with the current API? > > > > You can add such a constraint when updating the indices: > > > > if(index.get('email', address).hasNext()) { > > throw new RuntimeException("There are two nodes that share the same > > email address."); } else { > > index.put('email', address, node); > > } > > > > Marko. > > > > http://markorodriguez.com > > _______________________________________________ > > Neo4j mailing list > > User@lists.neo4j.org > > https://lists.neo4j.org/mailman/listinfo/user > > > > _______________________________________________ > > Neo4j mailing list > > User@lists.neo4j.org > > https://lists.neo4j.org/mailman/listinfo/user > > > _______________________________________________ > Neo4j mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > > _______________________________________________ > Neo4j mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
