Tree pattern issues

[Alexei Tenitski]

Hi there,

The problem I'm trying to solve is getting a set of nodes with there
related nodes (so, a set of trees).

Ie i want to select a list of objects and get tags assigned to them at
the same time (rather then do a separate call for each object).

Looks like there's some tree functionality available as described in
Tree Patter doc here:

https://github.com/tinkerpop/gremlin/wiki/Tree-Pattern

However, queries from that doc dont work in my case:

gremlin> g = TinkerGraphFactory.createTinkerGraph()
==> tinkergraph[vertices:6 edges:6]

gremlin> g.v(1).out.out.path
==> null

gremlin> g.v(1).out.out.path()
==> [v[1], v[4], v[5]]
==> [v[1], v[4], v[3]]

gremlin> g.v(1).out.out.tree.cap
undefined

==> g.v(1).out.out.tree.cap()
undefined

==> g.v(1).out.out.tree().cap()
==> No signature of method:
com.tinkerpop.gremlin.groovy.GremlinGroovyPipeline.tree() is applicable
for argument types: () values: []
==> Possible solutions: grep(), take(int), grep(java.lang.Object),
reset(), size(), store()

Some problem calling tree step, not sure what it the correct way.

Does anyone know what could be the issue here?

I'm using Neo4j 1.61

Cheers,
Alexei

[Marko Rodriguez]

Hi,

The tree step is in SNAPSHOT and hasn't been released yet. Do you Maven or are you simply using Gremlin via Neo Server GUI?

Marko.

http://markorodriguez.com

[Alexei Tenitski]

Hi Marco,

Using server GUI. What is Maven? I use REST in application and GUI to
play with Neo.

Does 1.7 include trees support?

Anyway, the original problem - getting a node and tag nodes linked to it
- it is something i would be able to do using the trees functionality?
Returning trees rather then flat lists would be a major point of
difference to rational DBs.

Cheers,
Alexei

Marko Rodriguez wrote:
> Hi,
>
> The tree step is in SNAPSHOT and hasn't been released yet. Do you Maven
> or are you simply using Gremlin via Neo Server GUI?
>
> Marko.
>
> http://markorodriguez.com
>
> On May 6, 2012 9:40 PM, "Alexei Tenitski" <ale...@ten.net.nz

> <mailto:ale...@ten.net.nz>> wrote:
>
> Hi there,
>
> The problem I'm trying to solve is getting a set of nodes with there
> related nodes (so, a set of trees).
>
> Ie i want to select a list of objects and get tags assigned to them
> at the same time (rather then do a separate call for each object).
>
> Looks like there's some tree functionality available as described in
> Tree Patter doc here:
>

> https://github.com/tinkerpop/__gremlin/wiki/Tree-Pattern

> <https://github.com/tinkerpop/gremlin/wiki/Tree-Pattern>
>
> However, queries from that doc dont work in my case:
>

> gremlin> g = TinkerGraphFactory.__createTinkerGraph()

> ==> tinkergraph[vertices:6 edges:6]
>
> gremlin> g.v(1).out.out.path
> ==> null
>
> gremlin> g.v(1).out.out.path()
> ==> [v[1], v[4], v[5]]
> ==> [v[1], v[4], v[3]]
>
> gremlin> g.v(1).out.out.tree.cap
> undefined
>
> ==> g.v(1).out.out.tree.cap()
> undefined
>
> ==> g.v(1).out.out.tree().cap()
> ==> No signature of method:

> com.tinkerpop.gremlin.groovy.__GremlinGroovyPipeline.tree() is

[Marko Rodriguez]

Hi,

> Using server GUI. What is Maven? I use REST in application and GUI to play with Neo.

Tree will not be available in Neo4j until the next release of Gremlin which is planned this month .

> Does 1.7 include trees support?

No.

> Anyway, the original problem - getting a node and tag nodes linked to it - it is something i would be able to do using the trees functionality? Returning trees rather then flat lists would be a major point of difference to rational DBs.

Yes, you would get your result as a Tree data structure with the ability to use dot notation to walk it.

root.child1.child11.child112 ....

Good luck with your project,
Marko.

http://markorodriguez.com

[Alexei Tenitski]

I see, thanks Marco, I'll use subqueries for now then.