jq select() and sort_by() - json

Question

I am parsing a curl output from gitlab api, and I need to add a sort_by to my query, then select only certain values.
sample input:
[
{
"id": 10,
"name": "another-test",
"path": "another-test",
"description": "",
"visibility": "private",
"lfs_enabled": true,
"avatar_url": null,
"web_url": "https://mygitlab/groups/another-test",
"request_access_enabled": false,
"full_name": "another-test",
"full_path": "another-test",
"parent_id": 9
},
{
"id": 11,
"name": "asdfg",
"path": "asdfg",
"description": "",
"visibility": "private",
"lfs_enabled": true,
"avatar_url": null,
"web_url": "https://mygitlab/groups/asdfg",
"request_access_enabled": false,
"full_name": "asdfg",
"full_path": "asdfg",
"parent_id": 7
}
I parse the JSON with jq as follows:
curl http://..... | jq -r '.[] | select(.parent_id!=null) | .name, .parent_id'
This works exactly as expected, but when I try to sort the results by parent_id, I get an error:
curl http://..... | jq -r '.[] | select(.parent_id!=null) | .name, .parent_id | sort_by(.parent_id)'
jq: error (at <stdin>:0): Cannot index number with string "parent_id"
I can use sort_by(), by putting a single dot instead than .[]:
curl http://..... | jq '. | sort_by(.parent_id) '
But I cannot combine the 2 functions.
Clarification: I need to extract name and parent_id, sorted by parent_id, when it is not null.
Thanks in advance

Answer 1

jq's sort_by() function accepts an array as input.
curl 'http://...' |
jq -r '
map(select(.parent_id != null))
| sort_by(.parent_id)[]
| [.name, .parent_id]
| #tsv
'
Sample output:
asdfg 7
another-test 9