Entries based on key present

[cueckoo]

Originally opened by @anjidevarasetty in cuelang/cue#506

below is my sample CUE file

import management

amend_users: {
  target_enable: "1"
  Users: [
    "John",
    "George"
  ]
}

if target_enable key is present, exported json should be like below

{
  "amend_users": {
    "update_configs": {
      "configurations": [
        {
          "configuration_key": "abc",
          "configuration_value": "1"
        },
        {
          "configuration_key": "xyz",
          "configuration_value": "1"
        }
      ]
    },
    "Users": [
      "John",
      "George"
    ]
  }
}

if target_enable not present json should be

{
  "amend_users": {
    "Users": [
      "John",
      "George"
    ]
  }
}

How can i implement it in cuelang

[cueckoo]

Original reply by @mpvl in cuelang/cue#506 (comment)

amend_users: {
  target_enable: "1"
  Users: [
    "John",
    "George"
  ]

  if target_enable != _|_ {
    update_configs: {
      configurations: [
        {
          configuration_key: "abc"
          configuration_value: "1"
        },
        {
          configuration_key: "xyz"
          configuration_value: "1"
        }
      ]
    }
  }
}

We're considering adding a defined builtin to make this more explicit.