how to “join” two vertices on Gremlin?

Question

I meet some trouble with Gremlin console; here is my schema.

Knowing:

• ID 1 (vertex)
• ID 3 (vertex)
• Label: "created" (edge)

I would like to get ID 9 (edge)

v = gv(1)

v.outE("created").id

only works if there is only one "created" edge

Answer 1

You can do:

g.e(9)

or, filtering from v[1]:

g.v(1).outE('created')[[id:9]]

or, if you mean getting the created edges between vertex 1 and 3:

g.v(1).outE('created').as('x').inV[[id:3]].back('x').id
g.v(1).outE('created').inV[[id:3]].back(2).id

Hope that helps, Marko.

http://markorodriguez.com

Answer 2

Thanks Marko, it works fine (but I have to use id:'3' instead of id:3).

And by the way, is this code:

g.v(1).outE('created').as('x').inV[[id:'3']].back('x').id

more efficient than this one:

g.v(1).outE.as('x').inV[[id:'3']].back('x').id