[SOLVED] Gremlin querying through groovy script using bulbs

Gremlin querying through groovy script using bulbs

I'm trying to figure out a better way of querying titan with gremlin through the python library bulbs.

I have a simple tree

       n0
     /   \
   /       \
  n1       n2
 /  \       \
n3  n4      n5

and I want to get n4 and the edges: e[n0 -> n1] => e1, e[n1 -> n4] => e2 leading up to n4. So in this example I want [e1, e2, n4]

I know all the indexes of the nodes before I do a query. In this example node_ids = ['ddbe4d52e7034ffeb17c9426fc1484af, '754d5e84daad4140ba93cb10ce00cde0', '7b2848543b444fcc94e69d7930ffa996']

With this information I can build this query which I feel is rather long and repetitive

g.V('nid', 'ddbe4d52e7034ffeb17c9426fc1484af').out
    .has('nid', '754d5e84daad4140ba93cb10ce00cde0').out
    .has('nid', '7b2848543b444fcc94e69d7930ffa996')

This only gives me the last node. I'm still trying to figure out this sideAffect thing that gremlin has to return the edges that I need.

I know I can create custom scripts and use those thorough gremlin, but I'm very new to all this stuff so help would be appreciated.

pseudo code of something I'm looking for

def get_node(nodes) {
    edges = []
    for node in nodes:
        get first node
        find edge that goes to second node
        edges.append(edge)
    return edges + last node
}

Also if anyone has a good tutorial on gremlin/groovy that would be helpful

Thanks

Solution

You can get the path. Try:

g.V('nid', 'ddbe4d52e7034ffeb17c9426fc1484af').outE.inV
.has('nid', '754d5e84daad4140ba93cb10ce00cde0').outE.inV
.has('nid', '7b2848543b444fcc94e69d7930ffa996').path

This gives you a list with:

[startVertex, startIntermediateEdge, intermediateVertex, intermediateTargetEdge, targetVertex]