How can I add key and values from one object into each object in an array via jolt

I’m using jolt and I have an input object where I would like to take the keys out of one property and insert them into each object of an array in another property:

My input:

{
  "jolt_marketplaceMetadata": {
    "NAN_KEY": 1,
    "TEMP": 3
  },
  "jolt_attributes": [
    {
      "name": "HELLO",
      "yyup": 3
    },
    {
      "huh": "please",
      "work": 2
    }
  ]
}

The result I’m aiming for:

 "jolt_attributes": [
    {
      "name": "HELLO",
      "yyup": 3,
      "NAN_KEY": 1,
      "TEMP": 3
    },
    {
      "huh": "please",
      "work": 2,
      "NAN_KEY": 1,
      "TEMP": 3
    }
  ]

I’ve tried a couple of different spec arrays and I’ve gotten pretty close, but I can’t seem to figure out how to get the values in without merging all of the data from each of the objects in the array:

[
  {
    "operation": "shift",
    "spec": {
      "jolt_attributes": {
        "*": {
          "*": "jolt_attributes[&1].&",
          "@(2,jolt_marketplaceMetadata)": "jolt_attributes[&1]"
        }
      }
    }
  }
]

which gives me:

{
  "jolt_attributes": [
    {
      "NAN_KEY": 1,
      "TEMP": 3,
      "name": "HELLO",
      "yyup": 3,
      "huh": "please",
      "work": 2
    },
    {
      "NAN_KEY": 1,
      "TEMP": 3,
      "name": "HELLO",
      "yyup": 3,
      "huh": "please",
      "work": 2
    }
  ]
}

It adds the keys from jolt_marketplaceMetadata, but it also merges all of the key/values from each of the array objects together each time.

Any ideas??

>Solution :

You can use the following shift transformation spec

[
  {
    "operation": "shift",
    "spec": {
      "jolt_attributes": {
        "*": {
          "*": "&2[#2].&",
          "@2,jolt_marketplaceMetadata.NAN_KEY": "&2[#2].NAN_KEY",
          "@2,jolt_marketplaceMetadata.TEMP": "&2[#2].TEMP"
        }
      }
    }
  }
]

where

• &2 replicates the key of the array ("jolt_attributes")
• [#2] loops through the indexes of that array after traversing the
  tree 2 levels(once for colon, once for opening curly brace) and generates arraywise(array of objects here) result