unable to create nested array

[horijon]

Want to convert/unflatten from

const jsonData = {
    "description": "SARS-CoV-2 (COVID-19) IgM Ab [Units/volume] in Serum or Plasma by Immunoassay"
};

to result

{
   "category":[
      {
         "coding":[
            {
               "display":"SARS-CoV-2 (COVID-19) IgM Ab [Units/volume] in Serum or Plasma by Immunoassay"
            }
         ]
      }
   ]
}

How do i write mapping logic for such case?
@ahmadassaf I am eagerly seeking for your kind help! And thank you for the library!

[ahmadassaf]

Hi @horijon,

to achieve the above you can define your mappings as:

{
  category: {
    "output": [],
    "innerDocument": "!",
    "mappings": {
      coding: {
        "output": [],
        "innerDocument": "!",
        "mappings": {
            "value": "description"
        }
      }
    }
  }
}

I created a sample repl.it example for you here and you can see that the output will be:

{
  "category": [
    {
      "coding": [
        {
          "value": "SARS-CoV-2 (COVID-19) IgM Ab [Units/volume] in Serum or Plasma by Immunoassay"
        }
      ]
    }
  ]
}

[horijon]

Thanks a lot! @ahmadassaf
I also want to revert it back (flatten). Please guide me for this as well.

[ahmadassaf]

if you will always have the same exact structure, so only one item in the array it is as simple as a JSON path traversal.

{
  description: "category[0].coding[0].value"
}