Return only a vertex's properties in Gremlin

[Johnny Weng Luu]

If I am returning a vertex in Gremlin it will return a object with "data" and all Restful links.

Eg.

" ... return product"

would give me:

{ outgoing_relationships: 'http://01c4f7335.hosted.neo4j.org:7023/db/data/node/4270/relationships/out',

    data: { name: 'Products' },

    traverse: 'http://01c4f7335.hosted.neo4j.org:7023/db/data/node/4270/traverse/{returnType}',

    all_typed_relationships: 'http://01c4f7335.hosted.neo4j.org:7023/db/data/node/4270/relationships/all/{-list|&|types}',

    property: 'http://01c4f7335.hosted.neo4j.org:7023/db/data/node/4270/properties/{key}',

    self: 'http://01c4f7335.hosted.neo4j.org:7023/db/data/node/4270',

    properties: 'http://01c4f7335.hosted.neo4j.org:7023/db/data/node/4270/properties',

    outgoing_typed_relationships: 'http://01c4f7335.hosted.neo4j.org:7023/db/data/node/4270/relationships/out/{-list|&|types}',

    incoming_relationships: 'http://01c4f7335.hosted.neo4j.org:7023/db/data/node/4270/relationships/in',

    extensions: {},

...

Is it possible to return only the "data" part, that is only a vertex's properties

[Peter Neubauer]

Well,
If you still want the node returned but with a different, more compact and less hypermedia representation, we could add a compact one. Otherwise, you could do iterate over the properties of each node, put the resulting maps into a list and return that, since then you will get value representations of the content back, not a node representation.

Send from a device with crappy keyboard and autocorrection.

/peter

[James Thornton]

+1 on that. Rexster's format is nice and compact.

- James

[Johnny Weng Luu]

Yeah I think adding a compact one that means only the properties are returned is a good alternative. Sometimes you just don't need the other links and it would speed things up not returning them.

Johnny

[Peter Neubauer]

Issue raised,

https://github.com/neo4j/community/issues/211

Cheers,

/peter neubauer

G:  neubauer.peter
S:  peter.neubauer
P:  +46 704 106975
L:   http://www.linkedin.com/in/neubauer
T:   @peterneubauer

Neo4j 1.6 released                 - dzone.com/6S4K
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[Matt Luongo]

As cool as a compact format would be, if you only need properties just

return product.map()

should do it for now, right?

On Feb 5, 10:25 am, Peter Neubauer <peter.neuba...@neotechnology.com>
wrote:

> Issue raised,
>
> https://github.com/neo4j/community/issues/211
>
> Cheers,
>
> /peter neubauer
>
> G:  neubauer.peter
> S:  peter.neubauer
> P:  +46 704 106975
> L:   http://www.linkedin.com/in/neubauer
> T:   @peterneubauer
>
> Neo4j 1.6 released                 - dzone.com/6S4K

> The Neo4j Heroku Challenge   -http://neo4j-challenge.herokuapp.com/

>
> On Sat, Feb 4, 2012 at 10:39 AM, Johnny Weng Luu
>
>
>
>
>
>
>
> <johnny.weng....@gmail.com> wrote:
> > Yeah I think adding a compact one that means only the properties are
> > returned is a good alternative. Sometimes you just don't need the other
> > links and it would speed things up not returning them.
>
> > Johnny
>

> > On Sat, Feb 4, 2012 at 7:54 AM, James Thornton <james.thorn...@gmail.com>

[Johnny Weng Luu]

Hm never thought about that. I'll try that!

Johnny

[Johnny Weng Luu]

Btw, using map() to return a vertex would give me:

'{name=IT}'

Is there a way to return it as a JSON hash instead?

'{name: IT}'

Johnny

[James Thornton]

Oh, that's a known bug with the representation code:

https://github.com/neo4j/gremlin-plugin/blob/master/src/main/java/org/neo4j/server/plugin/gremlin/GremlinToRepresentationConverter.java

The problem is that there is no Map converter so it falls through to convert the result to a String:

return ValueRepresentation.string( result.toString() );

 

And when converted to a String, a Java Map will look like this:

"{knows=2, likes=1}" 

Here's the issue on GitHub: https://github.com/neo4j/community/issues/163

- James

[Peter Neubauer]

This sux, I know.

Will try to look into it today.

Cheers,

/peter neubauer

G:  neubauer.peter
S:  peter.neubauer
P:  +46 704 106975
L:   http://www.linkedin.com/in/neubauer
T:   @peterneubauer

Neo4j 1.6 released                 - dzone.com/6S4K
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[Johnny Weng Luu]

That would be helpful. 

In the meantime I just return the whole node and access the "data" property instead.

Johnny

[Peter Neubauer]

Here you go,
https://github.com/neo4j/community/commit/6b4bc74fae9206c8a9294773aede35347a8b249e

Will soon update the Gremlin plugin so maps are returned properly, see
https://github.com/neo4j/gremlin-plugin/commit/87d7275b6edb459a51636abecbd7f662fa72cc3e#L3R145

Cheers,

/peter neubauer

G:  neubauer.peter
S:  peter.neubauer
P:  +46 704 106975
L:   http://www.linkedin.com/in/neubauer
T:   @peterneubauer

Neo4j 1.6 released                 - dzone.com/6S4K
The Neo4j Heroku Challenge   - http://neo4j-challenge.herokuapp.com/

[Johnny Weng Luu]

Finally the irritating bug will be gone. Thanks Peter!

Johnny

[Johnny Weng Luu]

This was for the Blueprint method map() right?

At the moment I have to do:

new Neo4jVertex(node, g).map

Is there a way to return the same properties but on a Neo4j node without having to convert it to a Blueprint vertex and use map() on it?

Johnny

[Peter Neubauer]

Johnny,

you just collect the property keys and values in a map with a utility
function like

n = g.v(0).getRawVertex()
props = [:]
n.getPropertyKeys().each{props[it]=n.getProperty(it)}
props

which will return the props Map :)

/peter

[Michael Hunger]

if you you need a one-liner:

n.propertyKeys.collectEntries { [it , n.getProperty(it)] }

[Johnny Weng Luu]

The one liner is kinda simpler. Groovy is indeed more concise :)

Thanks both!

Johnny