jq 在多映射结构 JSON 中查找键名

Question

I have this JSON object that maps the compatibility of patch sets to specific software versions.

{
   "compatibility":{
      "v7.11.x":[
         "7.12.1",
         "7.12.0",
         "7.11.2",
         "7.11.1",
         "7.11.0"
      ],
      "v7.13.x":[
         "7.14.2",
         "7.14.1",
         "7.14.0",
         "7.13.1",
         "7.13.0"
      ],
      "v7.15.x":[
         "8.1.0",
         "8.0.1",
         "8.0.0",
         "7.17.1",
         "7.17.0",
         "7.16.1",
         "7.16.0",
         "7.15.1",
         "7.15.0"
      ]
   }
}

Would it be possible for jq to return the patch set name (eg "v7.15.x") when given the specific version (eg "8.1.0")?

Answer 1

Yes, it's pretty straightforward actually.

.compatibility | to_entries[] | select(.value | index("8.1.0")) .key

^{Online demo}

In case it's unclear, the version string doesn't have to be hardcoded; it may come from outside the program too:

jq --arg version 8.1.0 '.compatibility | to_entries[] | select(.value | index($version)) .key'

Answer 2

If you need to query the same data set several times, it might be worth creating an index object, store it in a variable, and perform the lookup from there:

(.compatibility | with_entries({value: .key, key: .value[]})) as $lookup

# various ways to lookup multiple versions
| $lookup["8.0.1", "7.11.2"], $lookup["7.16.1"]

"v7.15.x"
"v7.11.x"
"v7.15.x"

Demo