Using and() / or() in Gremlin 3

[Erik Wittern]

Hi,

we have been using Titan with TinkerPop 2.x for a while now and are switching to TinkerPop3 at the moment. I have some trouble translating existing queries, tough. The queries make frequent use of and() and or() statements, for example to find all users that are authors of a book or whose position and description match certain criteria. In Gremlin 2.x, I used the following query:

g.V('type','User').and(_().out('author').has('type','Book'),_().or(_().has('position',CONTAINS,'staff'),_().has('description',CONTAINS,'researcher'))).as('user').select

Now, in Gremlin 3, I try something similar:

g.V().has('type','User').and(out('author').has('type','Book'),or(has('position',CONTAINS,'staff'),has('description',CONTAINS,'researcher'))).as('user').select()

However, I get the following errors (even though I clearly pass a String to out()):

java.lang.RuntimeException: javax.script.ScriptException: javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: com.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.out() is applicable for argument types: (java.lang.String) values: [feature]\nPossible solutions: get(java.lang.String), put(java.lang.String, java.lang.Object), wait(), any(), dump(), wait(long)\"}"

What am I doing wrong? I am also unclear about the documentation at http://tinkerpop.incubator.apache.org/docs/3.0.0.M8-incubating. For and(), examples show usage similar to my attempts: and(out(...),has(...)). However, for or(), the examples look like this: or(__.out(...),__.has(...)). What is the difference between these approaches?

Best regards,

Erik

[Daniel Kuppitz]

Hi Erik,

in order to use .and(out()...) you have to

static import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__.*

Without the static import you need to use the verbose format: .and(__.out()...).

Cheers,

Daniel

--
You received this message because you are subscribed to the Google Groups "Gremlin-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to gremlin-user...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/gremlin-users/f04e3c57-63e9-48ef-b7a4-1f8079163080%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[Erik Wittern]

Hi Daniel,

thanks for the reply! I tried your suggestion, using now (as a simple example):

g.V().or(__.has('type','User'),__.out('author'))

Still, I am getting errors:

"{\"message\": \"java.lang.RuntimeException: javax.script.ScriptException: javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: com.tinkerpop.gremlin.process.graph.util.DefaultGraphTraversal.or() is applicable for argument types: (com.tinkerpop.gremlin.process.graph.util.DefaultGraphTraversal, com.tinkerpop.gremlin.process.graph.util.DefaultGraphTraversal) values: [[HasStep([type,eq,API])], [VertexStep(OUT,[invocation],vertex)]]\nPossible solutions: sort(), any(), min(), grep(), max(), sum()\"}"

Any other idea what I might be doing wrong?

[Daniel Kuppitz]

I'm not able to reproduce this behavior. What's the context in which you're executing your queries? Does it work in the REPL? Does it work using curl? Both worked for me:

REPL:

gremlin> Gremlin.version()
==>3.0.0.M8
gremlin> g.V().or(__.has("name", "marko"), __.out("created")).values("name")
==>marko
==>josh
==>peter

curl:

daniel@cube /projects/apache/incubator-tinkerpop ((detached from 3.0.0.M8)) $ curl --silent --get 'http://localhost:8182' --data-urlencode 'gremlin=g.traversal().V().or(__.has("name", "marko"), __.out("created")).values("name")' | python -mjson.tool
{
    "requestId": "91e0576a-0911-47a4-af1d-ab0bb2d0393a",
    "result": {
        "data": [
            "marko",
            "josh",
            "peter"
        ],
        "meta": {}
    },
    "status": {
        "attributes": {},
        "code": 200,
        "message": ""
    }
}

Note that .traversal() has to be called explicitly in Gremlin Server 3.0.0.M8. However, it doesn't seem to be the problem in your case, since you're getting a totally different error.

Cheers,

Daniel

To view this discussion on the web visit https://groups.google.com/d/msgid/gremlin-users/54b3117b-b1c8-48e4-a0ad-c4414f844dc0%40googlegroups.com.

[Erik Wittern]

Hi Daniel, 

I appreciate you taking the time to look into this - thank you very much!

I am using a slightly older version 3.0.0M7. I tried the REPL, here is the output:

gremlin> Gremlin.version()
==>3.0.0.M7

gremlin> g.V().or(__.has("name", "marko"), __.out("created")).values("name")

No signature of method: com.tinkerpop.gremlin.process.graph.util.DefaultGraphTraversal.or() is applicable for argument types: (com.tinkerpop.gremlin.process.graph.util.DefaultGraphTraversal, com.tinkerpop.gremlin.process.graph.util.DefaultGraphTraversal) values: [[HasStep([name,eq,marko])], [VertexStep(OUT,[created],vertex)]]
Possible solutions: sort(), max(), sum(), any(), grep(), min()

Can it be the older version?

Cheers,

Erik

[Erik Wittern]

Oh, I also tried with traversal:

gremlin> g.traversal().V().or(__.has("name", "marko"), __.out("created")).values("name")
No signature of method: com.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph.traversal() is applicable for argument types: () values: []

...but I assume that is not needed in M7?!

[Erik Wittern]

I think I found the solution: in M8, the query works:

gremlin> Gremlin.version()
==>3.0.0.M8-incubating
gremlin> g.traversal().V().or(__.has('name','marko'),__.out('created')).values()
==>marko

Time to upgrade...

Daniel, thanks again for the support.