Well, I had already started writing this before I saw your response- so, if
you do decide down the road that you care more about immediate performance
than keeping DRY... ;)
g.setMaxBufferSize(0) //turn on tx handlings
g.startTransaction()
found = g.idx('node_auto_index')[[name:'uni...@example.com']].count()
if (found == 0) {
//other custom create code could go here, and/or have vars passed
through json
results = g.addVertex([:])
} else {
results = g.idx('node_auto_index')[[name:'uni...@example.com
']].count().next()
}
g.stopTransaction(TransactionalGraph.Conclusion.SUCCESS)
g.setMaxBufferSize(1)
results
would be something like the Groovy you'd use.
I don't blame you for wanting to avoid the many choices available right now
- I'm already generating Javascript for traversal pruning and templating
Gremlin, all in the name of performance...
--
Matt Luongo
Co-Founder, Scholr.ly
On Sun, Dec 4, 2011 at 2:38 AM, dnagir <dna...@gmail.com> wrote:
> Thanks Matt.
>
> Yeah. I think the transaction API is in making. Would be great addition.
>
> The server-side plugin will definitely work, but I personally prefer to
> use one way of doing things. At least until I will start speaking neo4j
> natively :)
>
> Cheers,
> Dmytrii
> http://www.ApproachE.com
>
>
> On 04/12/2011, at 6:35 PM, mhluongo [via Neo4j Community Discussions]
> wrote:
>
> > I've run into this problem, and resorted to using the Gremlin/Groovy over
> > REST (via the server-included plugin).
> >
> > There really isn't a way to transactionally express a conditional (or
> > get-or-create) like that over the vanilla REST API, though I'm sure it's
> in
> > the works.
> >
> > --
> > Matt Luongo
> > Co-Founder, Scholr.ly
> >
> >
> >
> > On Thu, Dec 1, 2011 at 5:45 PM, dnagir <[hidden email]> wrote:
> >
> > > Hi,
> > >
> > > I wonder what's the best way to do something similar to unique
> constraints
> > > in RDBMS.
> > >
> > > For example, user registration requires that the user's email to be
> unique.
> > >
> > > Working over in Ruby over REST API, how do you achieve this?
> > >
> > > I assume I need an auto-index on email property of User nodes. Then
> query
> > > it
> > > to check the property.
> > >
> > > But how can I make it transactional? So that I am sure that between
> > > querying
> > > and inserting the node, no similar has been inserted.
> > >
> > > The transactional part better applies to reservation instead of user
> > > creation. But you get the point.
> > >
> > > Cheers.
> > >
> > > --
> > > View this message in context:
> > >
> http://neo4j-community-discussions.438527.n3.nabble.com/Unique-constraint-and-transaction-over-REST-tp3553148p3553148.html
> > > Sent from the Neo4j Community Discussions mailing list archive at
> > > Nabble.com.
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