is there any gradle plugins to generate POKOs from...

# gradle

[czuckie]

is there any gradle plugins to generate POKOs from a JSON Schema file? I found one, but the documentation is lacking a usable example to learn from and following the README has resulted in 0 classes being generated with no meaningful log messages

[Adam S]

Have you been able to find any tool that can generate Kotlin from a JsonSchema? I ask because if it exists, then you could define a custom Gradle Exec task to run it on demand.

[czuckie]

the gradle plugin wraps a library written by the same guy that does that

[czuckie]

I think he might have a little bit of a monopoly on the situation as it stands

[Adam S]

I think monopoly is an unfair word blob sweat smile

[czuckie]

the reason I'm going down this route is because I'm using OpenAPI spec code generation currently but can't seem to configure it in a way i want (I only want the POKOs)

[czuckie]

they're definitely a nomad in this space at least

[czuckie]

first PR I'll be raising is a functional example project if I get it working 😂

[Adam S]

yeah, I remember looking into some sort of language-independent schema-based code generation a while ago, and coming up short. Which I found really surprising - it's such a common problem, and (in principle) an easy one to 'solve'

[czuckie]

I'm hesitant to roll my sleeves up, but I'm getting there

[Adam S]

related thread about OpenAPI generation from a few months ago: https://kotlinlang.slack.com/archives/C0B8RC352/p1681213282825509

[Adam S]

are you in control of the OpenAPI schema? As in, could you use something (e.g. http4k) to generate the schema, in a Kotlin-first approach?

[czuckie]

the service we're going to be integrating against has an OpenAPI schema I believe, I've been able to generate some model classes (woo!) but they come with an infrastructure package I don't want or need (boo!)

Unfortunately I don't think I can weave any http4k into this, I'm making a client to the services, not the services themselves. Though I'm looking for a reason to use http4k in production!

[Adam S]

an infrastructure package

as in the generator creates a HTTP server/client cruft, while you just want the data classes?

[czuckie]

bingo

[Adam S]

ahh okay, and which generator are you using?

[czuckie]

id("org.openapi.generator") _version_ "5.1.1"

[Adam S]

iirc that has an option to only generate the data classes

[czuckie]

I feel like an idiot, but I can't find anything that seems to do that

[Adam S]

I'm pretty sure this is it

https://openapi-generator.tech/docs/customization/#selective-generation

# generate only models
--global-property models

[Adam S]

I only tried using OpenAPI Generator once as a demo, but never had a chance to use it in anger

[czuckie]

well I'm very angry so let's go! 😄 I'll see if I can figure out how to use those global properties in the gradle plugin

[czuckie]

gnarly:

openApiGenerate {
   ...
   globalProperties.put("models", "") // Generate only models
   ...
}

[Casey Brooks]

This intellij plugin is pretty nice. I’ve used it for converting raw JSON responses into models, but it looks like it should support JSONSchema as well