split string

[Dennis D]

Hi,

I'm new to Gremlin, using the console so far.

The nodes of my graph have names that represent file system paths, like "a/b/c".

I would like to add an additional property to each node that represents just the last part, "c" in case of the above example.

Can I use string manipulation like split('/')?

Thanks,

Dennis.

[Robert Dale]

You would have to use a lambda to do it in a traversal. 

# add a test node

g.addV().property('name','a/b/c')

# create new property from name

g.V().property('leaf', __.values('name').map({it.get().split('/').last()}))

# show result

g.V().has('name','a/b/c').valueMap(true)

==>[id:1,label:vertex,name:[a/b/c],leaf:[c]]

Robert Dale

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[Dennis D]

Thanks a lot. This works for me.

A related question: I would like to get a list of all nodes whose 'name' property contains a certain character (say "~").

(I tried a lot of queries, but none works.)

[Daniel Kuppitz]

The same thing, you'll need a lambda.

If it's guaranteed that all vertices have a name property:

g.V().filter {it.get().value("name").contains("~")}

Otherwise:

g.V().has("name").filter {it.get().value("name").contains("~")}  // or

g.V().filter {p = it.get().property("name") ; p.isPresent() && p.value().contains("~")}

Cheers,

Daniel

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