How to project values from a Gremlin traversal with nested and()/or() steps - gremlin

Question

I have the graph model below which represents the sub-pattern I'd like to traverse or fetch. The nodes and their properties are shown below as well.
The expected response to my query would look something like this:
where 's', 'c', 'aid', 'qid', 'p', 'r1', 'r2' are the nodes that make up the subpattern or subgraph.
[
{
"s": {
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4",
"label": "severity",
"type": "vertex",
"properties": {
"severity": [
{
"id": "a6a9e38f-0802-48b6-ac37-490f45e824e9",
"value": "High"
}
],
"pk": [
{
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4|pk",
"value": "pk"
}
]
}
},
"c": {
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4",
"label": "cve",
"type": "vertex",
"properties": {
"cve_id": [
{
"id": "a6a9e38f-0802-48b6-ac37-490f45e824e9",
"value": "CVE-xxxx-xxxx"
}
],
"publishedOn": [
{
"id": "fc5dde4d-c027-4c19-9b16-b3314b2b10c6",
"value": "xxx"
}
],
"pk": [
{
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4|pk",
"value": "pk"
}
]
}
},
"aid": {
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4",
"label": "aid",
"type": "vertex",
"properties": {
"aid": [
{
"id": "a6a9e38f-0802-48b6-ac37-490f45e824e9",
"value": "xxxx-xxxx"
}
"pk": [
{
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4|pk",
"value": "pk"
}
]
}
},
"qid": {
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4",
"label": "qid",
"type": "vertex",
"properties": {
"qid": [
{
"id": "a6a9e38f-0802-48b6-ac37-490f45e824e9",
"value": "xxxx-xxxx"
}
"pk": [
{
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4|pk",
"value": "pk"
}
]
}
},
"p": {
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4",
"label": "package",
"type": "vertex",
"properties": {
"name": [
{
"id": "a6a9e38f-0802-48b6-ac37-490f45e824e9",
"value": "xxxxx"
}
],
"version": [
{
"id": "fc5dde4d-c027-4c19-9b16-b3314b2b10c6",
"value": "xxx"
}
],
"pk": [
{
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4|pk",
"value": "pk"
}
]
}
},
"r1": {
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4",
"label": "release",
"type": "vertex",
"properties": {
"source": [
{
"id": "a6a9e38f-0802-48b6-ac37-490f45e824e9",
"value": "xxxx-xxxx"
}
],
"status": [
{
"id": "fc5dde4d-c027-4c19-9b16-b3314b2b10c6",
"value": "xxx"
}
],
"pk": [
{
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4|pk",
"value": "pk"
}
]
}
},
"r2": {
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4",
"label": "release",
"type": "vertex",
"properties": {
"source": [
{
"id": "a6a9e38f-0802-48b6-ac37-490f45e824e9",
"value": "xxxx-xxxx"
}
],
"status": [
{
"id": "fc5dde4d-c027-4c19-9b16-b3314b2b10c6",
"value": "xxx"
}
],
"pk": [
{
"id": "345fbdad-9c67-47bb-9f3b-cf50c8cdbee4|pk",
"value": "pk"
}
]
}
},
{
....
....
},
{
....
..
}
]
My question is how do I build my traversal query to achieve this end result?
What I have so far is this, but the project() step is not working as expected
g.V().hasLabel('cve').as('c').and(
__.in('severity').as('s'),
__.out('cve_to_aid').as('aid').and(
__.out('has_qid').as('qid'),
__.in('package_to_aid').as('p'),
or(
__.in('r1_to_aid').has('status', 'Patched').as('r1'),
__.in('r2_to_aid').has('status', 'Patched').as('r2')
)
)
).project('c', 's', 'aid', 'qid', 'p', 'r1', 'r2').
by(('c').values('cve_id')).
by(('s').values('severity')).
by(('aid').values('aid')).
by(('qid').values('qid')).
by(('p').values()).
by(('r1').values()).
by(('r2').values()).
I am doing this on CosmosDB, so please only provide answers using supported steps found here: https://learn.microsoft.com/en-us/azure/cosmos-db/gremlin/support

Answer 1

It is possible to nest project() steps, e.g. on the TinkerGraph:
gremlin> g = TinkerFactory.createModern().traversal()
==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
gremlin> g.V(1).as('x').project('x').by(
select('x').project('id', 'label','properties').by(id).by(label).by(
project('name').by(properties())
)
)
==>[x:[id:1,label:person,properties:[name:vp[name->marko]]]]
gremlin>
but then you end up coding your entire data model into your query.
In full TinkerPop you could turn your result into a subGraph() and write it to graphSon with the io() step. In Cosmos you can add the returned vertices to a TinkerGraph instance clientside and again use the io() step to serialize the TinkerGraph to graphSon.