Check if a key exists and return another key - json

Question

I need help with jq syntax on how to return the Gitlab job ID if it contains an artifact. The JSON output looks like this (removed a lot of unrelated info from it and added [...]):
[{
"id": 3219589880,
"status": "success",
"stage": "test",
"name": "job_with_no_artifact",
"ref": "main",
"tag": false,
"coverage": null,
"allow_failure": false,
"created_at": "2022-10-24T18:21:25.119Z",
"started_at": "2022-10-24T18:21:25.986Z",
"finished_at": "2022-10-24T18:21:38.464Z",
"duration": 12.478682,
"queued_duration": 0.499786,
"user": {
"id": 123456789,
[...]
},
"commit": {
"id": "5e0e1f287d20daf2036a3ca71c656dce55999265",
[...]
"pipeline": {
"id": 123456789,
[...]
"project": {
"ci_job_token_scope_enabled": false
},
"artifacts": [],
"runner": {
"id": 12270859,
[...]
},
"artifacts_expire_at": null,
"tag_list": []
}, {
"id": 3219589878,
"status": "success",
"stage": "test",
"name": "create_artifact_job_2",
"ref": "main",
"tag": false,
"coverage": null,
"allow_failure": false,
"created_at": "2022-10-24T18:21:25.111Z",
"started_at": "2022-10-24T18:21:25.922Z",
"finished_at": "2022-10-24T18:21:39.090Z",
"duration": 13.168405,
"queued_duration": 0.464364,
"user": {
"id": 123456789,
[...]
},
"commit": {
"id": "5e0e1f287d20daf2036a3ca71c656dce55999265",
[...]
},
"pipeline": {
"id": 675641982,
[...],
"project": {
"ci_job_token_scope_enabled": false
},
"artifacts_file": {
"filename": "artifacts.zip",
"size": 223
},
"artifacts": [{
"file_type": "archive",
"size": 223,
"filename": "artifacts.zip",
"file_format": "zip"
}, {
"file_type": "metadata",
"size": 153,
"filename": "metadata.gz",
"file_format": "gzip"
}],
"runner": {
"id": 12270845,
[...]
},
"artifacts_expire_at": "2022-10-25T18:21:35.859Z",
"tag_list": []
}, {
"id": 3219589876,
"status": "success",
"stage": "test",
"name": "create_artifact_job_1",
"ref": "main",
"tag": false,
"coverage": null,
"allow_failure": false,
"created_at": "2022-10-24T18:21:25.103Z",
"started_at": "2022-10-24T18:21:25.503Z",
"finished_at": "2022-10-24T18:21:41.407Z",
"duration": 15.904028,
"queued_duration": 0.098837,
"user": {
"id": 123456789,
[...]
},
"commit": {
"id": "5e0e1f287d20daf2036a3ca71c656dce55999265",
[...]
},
"pipeline": {
"id": 123456789,
[...]
},
"web_url": "WEB_URL",
"project": {
"ci_job_token_scope_enabled": false
},
"artifacts_file": {
"filename": "artifacts.zip",
"size": 217
},
"artifacts": [{
"file_type": "archive",
"size": 217,
"filename": "artifacts.zip",
"file_format": "zip"
}, {
"file_type": "metadata",
"size": 152,
"filename": "metadata.gz",
"file_format": "gzip"
}],
"runner": {
"id": 12270857,
},
"artifacts_expire_at": "2022-10-25T18:21:37.808Z",
"tag_list": []
}]
I've been trying to do either of the following using jQ:
Either:
Check if artifacts_file key exists in each iteration and if it does return the (job) id (so .[].id)
Check if artifacts array is empty in each iteration and if it is empty return the (job) id.
In both cases I'm able to do the first part but I am not sure how to return the .id key.
Related stackoverflow questions that I've been trying to utilize and adapt to my case:
jq - return array value if its length is not null
How to check for presence of 'key' in jq before iterating over the values
What I have so far: jq '[.[].artifacts[]|select(length > 0)] | .[]' which returns all the artifacts found (but it doesn't contain the .id of the job).

Answer 1

Checking the existence of a field using has:
.[] | select(has("artifacts_file")).id
3219589878
3219589876
Demo
Checking if a field is an empty array by comparing it to []:
.[] | select(.artifacts == []).id
3219589880
Demo