TinkerPop 3: Gremlin query to group count by edge direction

Question

I have a vertex id to start with and wanted to get counts of in and out edges.

g.traversal().V().has("__id", "1234").groupCount().by(Direction.BOTH)

As .by() step wont accept Direction type., is there any alternative way?

Answer 1

You can do this nicely with project step:

gremlin> graph = TinkerFactory.createModern()
==>tinkergraph[vertices:6 edges:6]
gremlin> g = graph.traversal()
==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
gremlin> g.V().has('name','marko').
               project('out','in').
                 by(outE().count()).
                 by(inE().count())
==>[out:3,in:0]

For TinkerPop 3.0.x, which didn't have project you could do:

gremlin> g.V().has('name','marko').as('out','in').
               select('out','in').
                 by(outE().count()).
                 by(inE().count())
==>[out:3,in:0]