Gremlin shell won't work after I run remote operations

[Johnny Weng Luu]

For some weird reason I can't run anything on Gremlin shell after I have done some remote Gremlin operations using HTTP gremlin plugin.

Eg.

In Gremlin shell:

• gremlin> g.clear()
• ==> 
• gremlin> g.addVertex([name:'foo']); g.V.name
• ==> foo

That one shows everything works.

Now in HTTP shell:

• http> POST /db/data/ext/GremlinPlugin/graphdb/execute_script {"script": "g.clear()"}
• ==> 200 OK
• ==> "null"

And switch back to Gremlin shell:

• gremlin> g.addVertex([name:'foo']); g.V.name
• undefined

Something is clearly wrong here.

Seems like a bug.

Could someone help me out.

Johnny

[Marko Rodriguez]

Huh. Looks like the variable g got lost? ... Perhaps just do 'g' and see what it returns.

?,

Marko.

http://markorodriguez.com

[Johnny Weng Luu]

g returns the graph:

• ==> g
• ==> neo4jgraph[EmbeddedGraphDatabase [/mnt/ad2a30dd7/data/graph.db]]
• undefined

[Johnny Weng Luu]

I'm using the Neo4j heroku addon. Maybe someone could try the same thing to confirm this bug?

Johnny

[Peter Neubauer]

Johnny,
this happens in a local server installation, too. I file a bug for
now, https://github.com/neo4j/community/issues/205

Cheers,

/peter neubauer

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[Peter Neubauer]

Just to let everyone know, this has been actually three bugs, see

https://github.com/neo4j/community/issues/208
https://github.com/tinkerpop/blueprints/issues/205
https://github.com/tinkerpop/blueprints/issues/200

That all where resulting in the behaviour seen at g.clear(). All these
are fixed now, but the blueprints issues will make it first in Neo4j
after a stable release there.

Meanwhile, try to avoid g.clear() with the current Neo4j version, and do

g.V.sideEffect{g.removeVertex(it)}

as a way to delete all content in the graph.

Cheers,

/peter neubauer

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

Wow, cool that they all are fixed!

"g.V.sideEffect{g.removeVertex(it)}" didn't work.

Don't you mean: "g.V.sideEffect{g.removeVertex(it)}.iterate()"?

See https://groups.google.com/forum/#!topic/neo4j/EBLg_YMQBDU

Johnny

[Peter Neubauer]

yeah,
depends on what shell you are in, REST for instance will automatically iterate.

Cheers,

/peter neubauer

G:  neubauer.peter
S:  peter.neubauer
P:  +46 704 106975
L:   http://www.linkedin.com/in/neubauer
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Neo4j 1.6 released                 - dzone.com/6S4K
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[Johnny Weng Luu]

You mean the opposite?

Sending Gremlin queries using the REST Gremlin plugin didn't iterate, but using the Gremlin shell did iterate automatically.

Why are queries sent by REST not iterated automatically?

Johnny

[Peter Neubauer]

yes,
true. REST should be iterated, and the Gremlin shell, too. What was
the one were it didn't work?

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]

It didn't work when I'm sending a gremlin script through HTTP.

Johnny

[Peter Neubauer]

Ahh ok. I think that is extected.

Cheers,

/peter neubauer

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S:  peter.neubauer
P:  +46 704 106975
L:   http://www.linkedin.com/in/neubauer
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Neo4j 1.6 released                 - dzone.com/6S4K
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[Johnny Weng Luu]

But why?

Johnny

[DasIstAberSeltsam]

I also find that a little confusing, that most things that one tests in the shell don't work in a script and vice versa, since the shell automatically iterates.

This confused me a lot when starting with Gremlin.

On Monday, 30 January 2012 03:24:26 UTC-5, Johnny Luu wrote:

But why?

Johnny

[Michael Hunger]

If it wouldn't iterate it wouldn't be able to show anything.

And for the plugin automatic iteration could be an option but if you 

#1 want to do other stuff

#2 want to stream

This might not be what you want?

Cheers

Michael

(neo4j.org) <-[:WORKS_ON]- (@mesirii) -[:TAKES_CARE_OF]-> (you) -[:WORKS_WITH]->(@Neo4j)

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[Martin Boissier]

Well, I personally don't expect a REPL to iterate over each object
that I enter into the REPL. I definitely would not do it automatically
in the plugin, but rather make it explicit in the REPL.

But I am quite new to Gremlin, there might be a lot of other things to consider.

2013/2/12 Michael Hunger <michael...@neotechnology.com>:

[Marko Rodriguez]

Hi,

If you don't want it to iterate for you in the REPL, you can do this:

gremlin> g.v(1).my.traversal; null
==>null
gremlin>

HTH,
Marko.

http://markorodriguez.com