Add element to arrays, that are values to a given key name (json transformation with jq)

Question

I'm a jq newbie, and I try to transform a json (a Swagger spec). I want to add an element to the array value of the "parameter" keys:

{
  ...
  "paths": {
    "/great/endpoint1": {
      "get": {
        "parameters": [] <<--- add a value here
       }
    }
    "/great/endpoint2": {
      "post": {
        "parameters": [] <<-- and here too here too etc.
  ....

The following jqplay almost works. It adds values to the right arrays, but it has the nasty side effect of also removing the "x-id" value from the root of the input json. It's probably because of a faulty if-condition. As the paths contain a varying string (the endpoint names), I don't know how to write a wildcard path expression to address those, which is why I have tried using walk instead: https://jqplay.org/s/az56quLZa3

peak · Accepted Answer · 2020-04-30 21:28:42Z

1

Since the sample data is incomplete, it's difficult to say exactly what you're looking for but it looks like you should be using parameters in the call to walk:

walk(if type=="object" and has("parameters")
     then .parameters += [{"extra": "value"}]
     else . end)

If you want to restrict the walk to the top-level paths, you would preface the above with: .paths |=

answered Apr 30, 2020 at 21:28

peak

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1 Comment

grewil Over a year ago

Thanks! This works! Gosh, before posting here I spent hours trying to get the syntax for this right. When I couldn't, I tried the above variant with existence of key "schema" in the first element. Now it looks right and works right! Thanks!

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