Gremlin get elementMap() for vertices and valueMap() for edges when used with .bothE().otherV().path()

Question

Assume we want to retrieve all in-coming and out-going edges for some specific vertex and have the result include from_vertex, edge and to_vertex.

The following should give us the result.

g.V(1).bothE().otherV().path()
==>path[v[...], e[...][...-...->...], v[...]]

The following adds .elementMap() for vertices and edge.

g.V(1).bothE().otherV().path().by(__.elementMap())
==>path[{...} {...} {...}]

Now, we want to retrieve the properties, where we want to use .elementMap() for the vertices and .valueMap() for the edges. My first guess is the following

g.V(1).
  bothE().as("edges").
  otherV().as("nodes").
  path().
  by(__.select("nodes").elementMap().select("edges").valueMap())

which just returns

==>path[null, null, null]

Any ideas? Further, how to get the path output for an entire subtree starting from some specific vertex.

Answer 1

Your path will be an alternating list of node-edge-node etc. To get the desired results you just need to use two by modulators.

g.V(1).
  bothE().
  otherV().
  path().
    by(elementMap()).
    by(valueMap())