Group by out vertices in Gremlin

Question

i have this structure:

Groups -> Fields -> Values

and a command g.V().hasLabel('groups').out('fields').out('values')

how can I group these values by fields and by 'groups' vertices?

Thank you

Answer 1

This was answered on the Gremlin Users list by Daniel Kuppitz:

g.V().hasLabel("groups").
  group().
    by().
    by(out("fields").
         group().
           by().
           by(out("values").fold()))