Groovy Modifying Json-CodePudding

I'm trying to modify a json which I'm reading from a file:

String response = new File("response.json").text

here is what response looks like:

{
  "TerminatingInstances": [
    {
      "InstanceId": "id",
      "CurrentState": {
        "Code": 32,
        "Name": "shutting-down"
      },
      "PreviousState": {
        "Code": 16,
        "Name": "running"
      }
    }
  ]
}

To modify it I did as follows:

def slurped = new JsonSlurper().parseText(response)
def builder = new JsonBuilder(slurped)
builder.content.TerminatingInstances.InstanceId = "id-updated"

but I get argument type mismatch error, not sure why.

CodePudding user response：

That's because it's an array of instances inside TerminatingInstances

You can either set all of them to the new id with *.:

builder.content.TerminatingInstances*.InstanceId = "id-updated"

Or set just the first one with

builder.content.TerminatingInstances[0].InstanceId = "id-updated"