How can I duplicate multiple times an existing object within a JSON array using jq?

Question

I have the following json file:

{
  "actions": [
    {
      "values": "test",
      "features": [
        {
          "v1": 100,
          "v2": {
            "dates": [
              "2020-04-08 06:58:26",
              "2020-04-08 06:58:26"
            ]
          }
        }
      ]
    }
  ]
}

I would like to append n-times the object within the "actions" array to the end of it, creating n+1 total objects.

Expected output if n=2:

{
  "actions": [
    {
      "values": "test",
      "features": [
        {
          "v1": 100,
          "v2": {
            "dates": [
              "2020-04-08 06:58:26",
              "2020-04-08 06:58:26"
            ]
          }
        }
      ]
    },
    {
      "values": "test",
      "features": [
        {
          "v1": 100,
          "v2": {
            "dates": [
              "2020-04-08 06:58:26",
              "2020-04-08 06:58:26"
            ]
          }
        }
      ]
    },
    {
      "values": "test",
      "features": [
        {
          "v1": 100,
          "v2": {
            "dates": [
              "2020-04-08 06:58:26",
              "2020-04-08 06:58:26"
            ]
          }
        }
      ]
    }
  ]
}

I found this answer [How can I duplicate an existing object within a JSON array using jq? however it only works with one element at the end.

Inian · Accepted Answer · 2020-04-30 11:01:23Z

0

You can just use a reduce() function with range() together to create the index to include the object at.

jq --arg n 2 'reduce range(0, ($n|tonumber)) as $d (.; .actions[$d+1] += .actions[0] )' json

answered Apr 30, 2020 at 11:01

Inian

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2 Comments

ana Over a year ago

Thank you! It is exactly what I was looking for.

Inian Over a year ago

@ana: if this worked, please click on the tick-mark next to answer to mark the post "resolved". See What does it mean when an answer is "accepted"? and What should I do when someone answers my question?

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