Use a jq range variable to feed into a new jq filter - variables

Question

I have some JSON that looks like this:
{
"vertices": [
{
"id": 71597,
"ns": "ca",
"alias": "polarized"
},
{
"id": 129748,
"ns": "av",
"name": "Polarized"
},
{
"id": 129898,
"ns": "av",
"name": "False"
}
],
"edgeGroups": {
"hasAttributeValue": [
[
0,
1
],
[
0,
2
]
]
}
}
The various entries in .vertices are related by their array index. So in this case, the first vertex (id: 71597 - with an array index of 0) has attribute values 129748 and 129898 (with array indices 1 and two respectively).
I can get the array index for the attribute I'm searching for with the following jq filter:
.vertices | range(0;length) as $i | select(.[$i].alias=="polarized" and .[$i].ns=="ca") | $i
That returns an $i value of 0, since the object with alias "polarized" is the first item in the array. You can try it out here on jq play:
https://jqplay.org/s/DsHYi7ixyn
Now I want to use that $i value in a different filter, so instead of outputting 0 it outputs something like the result of this:
.edgeGroups.hasAttributeValue[] | select(.[0] == 0)
I've tried using the pipe operator like this but it just gives me an error:
.vertices | range(0;length) as $i | select(.[$i].alias=="polarized" and .[$i].ns=="ca") | .edgeGroups.hasAttributeValue[] | select(.[0] == $i)
If I could understand how to use the $i in a chained filter, I think I could solve my main goal, which is to chain several filters together so that I can get all the items associated with the 71597 object - i.e.
{
"id": 129748,
"ns": "av",
"name": "Polarized"
},
{
"id": 129898,
"ns": "av",
"name": "False"
}
Thanks for any help in advance!

Answer 1

Your jq filter could be fixed with a couple of parentheses:
(.vertices
| range(0;length) as $i
| select(.[$i].alias=="polarized" and .[$i].ns=="ca")
| $i) as $i
| .edgeGroups.hasAttributeValue[]
| select(.[0] == $i)