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
