[lloeki]

I benefit greatly from schema validation in Ruby, ensuring that ingress-processing code does not receive e.g a String or Hash instead of an Array which would have things blow up way after the ingress edge when a call to an Array method fails, or worse, produce silently broken behaviour that may or may not blow up even farther down the road because both String and Hash respond to e.g #[](Integer).

[nly]

Yeah but Ruby is a dynamically typed language. There's not much benefit to codegen since nothing is checked at compile time anyway.

[lloeki]

I found code generation to be useful in Ruby with protobuf. This:

https://github.com/lloeki/ruby-skyjam/blob/master/defs/skyja...

gives that:

https://github.com/lloeki/ruby-skyjam/blob/master/lib/skyjam...

I would certainly enjoy having a DSL to write descriptive code to validate using JSON schema, but it would be even better if the Ruby definitions could be generated and persisted in Ruby files using that DSL.

Also, storing things in basic hash/array types works, but having dedicated types is useful, so that one can ensure not shoving one kind of hash in place of another unrelated kind of hash.

As for types themselves in general, there's RBS and Sorbet. One could have type definition generation as well for even deeper static and runtime checks.