KCL Overrides

[jeet23]

We know that Helm uses values files to perform overrides until any depth.

In KCL, what is the recommend approach to perform such overrides?

Example

I have a schema:

schema Application:
    name: str
    region?: str
    availabilityDomain?: str

Level 1

I have a base file,
eg: base = Application { name = "my-app"}.

KCL output:

application:
  name: "my-app"

Level 2

I want an override it with a specific region,
eg: dev = Application { name = "my-app" , region = "dev" }.

KCL output:

application:
  name: "my-app"
  region: "dev"

Level 3

I want an override it with a specific region within a specific availability domain,
eg: dev_1a = Application { name = "my-app" , region = "dev", availabilityDomain = "1a" }.

KCL output:

application:
  name: "my-app"
  region: "dev"
  availabilityDomain: "1a"

In Helm, I'd do something like:
helm template my-chart --values base.yaml --values dev.yaml --values dev_1a.yaml

In KCL, what is the best way to approach this problem statement?

[Peefy]

Have you tried the KCL override feature? Can it help you? https://www.kcl-lang.io/docs/user_docs/guides/automation

[jeet23]

@Peefy Thanks for sharing the idea, I have given it a try already. The approach to use individual overrides can become cumbersome, as I have to provide each field separately to the --overrides parameter.

[jeet23]

Do you know if we can provide an entire object to be replaced or maybe an array of override_spec?

[jeet23]

@Peefy I'm stuck at a point where I'm unable to override individual array elements.

Schema:

schema FruitList:
    items: [str]

my_fruits: FruitList = {
    items = ["apple", "banana", "pear"]
}

Run:

kcl run test.k -O my_fruits.items[\'1\']=\'melon\'

Output:

 --> ~/test.k:2:5
  |
2 |     items: [str]
  |     ^ variable is defined here, its type is [str], but got {str(1):str(melon)}
  |


error[E2G22]: TypeError
 --> ~/test.k:4:1
  |
4 | my_fruits: FruitList = {
  | ^ expected [str], got [str] | {str:str}
  |

 --> ~/test.k:2:5
  |
2 |     items: [str]
  |     ^ variable is defined here, its type is [str], but got [str] | {str:str}
  |

Can you please guide me here? Thanks!