Kotlin Client Generator support for Enum Unknown Values - kotlin

Question

I'm wondering if there is a way to generate a kotlin lib from an openapi spec that will support a default value if it doesn't serialize a known enum value.
Ex: the Java Generator has the enumUnknownDefaultCase flag in its spec
Ref from the kotlin generator seems to read in the config for the moshi serializer here
But unable to get this working by specifying the following two options via the kotlin generator:
"moshiCodeGen": "true"
"enumUnknownDefaultCase": "true"
Related conversation here
Thanks for any help figuring out how to get kotlin clients to not explode on new enumeration values.

Answer 1

If you are using openapi-generator-cli to generate code, the option enumUnknownDefaultCase should working by adding --additional-properties=enumUnknownDefaultCase=true
Example:
java -jar openapi-generator-cli-6.0.0.jar -i "example.com/swagger?format=openapi" -g kotlin --library=jwm-retrofit2 -o my-api-sdk --additional-properties=enumUnknownDefaultCase=true
It will create a SerializerHelper class which will add additional enum-adapter to Moshi builder like this
moshiBuilder
.add(MyEnum::class.java, EnumJsonAdapter.create(MyEnum::class.java).withUnknownFallback(MyEnum.unknown_default_open_api))
.add(...)
But it's not done yet, when initialize your ApiClient, you must force it to use MoshiBuilder with the enum-adapter, by default it won't use that one.
Retrofit.Builder()
.baseUrl(baseUrl)
.addConverterFactory(ScalarsConverterFactory.create())
++ .addConverterFactory(MoshiConverterFactory.create(Serializer.moshi))
-- .addConverterFactory(MoshiConverterFactory.create(serializerBuilder.build()))
.apply {
if (converterFactory != null) {
addConverterFactory(converterFactory)
}
}