Default values are ignored

[andiskrauklis]

I'm having a problem with a default value.

version: sbt-guardrail:0.69.0.1

Definition

properties:
  fieldOne:
    type: String
  fieldTwo:
    type: Boolean
    default: false

Generated code

case class Something(fieldOne: String, fieldTwo: Boolean = false)

So far, so good.

However, once I POST JSON without a value

{
  "fieldOne": "test"
}

I get the error
Attempt to decode value on failed cursor: DownField(fieldTwo)

[blast-hardcheese]

Hello @andiskrauklis, I've been punting on this issue for a while (since #197, actually).

The challenge is that the default parameters are not known by the Decoder[Something] instance.

Additionally, should we apply the default value on the server (on decode but not encode)? What about the client (on decode but not encode)?

What might be a reasonable middleground would be to have a def defaults: JsonObject in the companion, then use deepMerge before attempting to decode, but I've never had a use for this feature, so I don't have any intuition around what is correct.