Fix x-discriminator-value processing

[jpfinne]

Fix #17343 allowing correct marshalling/unmarshalling of objects using an x-discrimininator-value

Test various combination of swagger/openapi, modelNameSuffix...

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[wing328]

cc @OpenAPITools/generator-core-team

[wing328]

can you please update the samples too? https://github.com/OpenAPITools/openapi-generator/actions/runs/7940713183/job/21756786029?pr=17781

[jpfinne]

@wing328 Sorry I'm new to the whole process. I've managed to install a portable version of git bash on my Windows laptop. And I can regenerate the samples.

JacksonTest on master is wrong in the test for

returns("CatDto", AnimalDto::getClassName)

It should be "Cat".

All the previous attempts tried to skip the generation of @JsonTypeName. It does not work for all cases (parent class, middle class...)

I've used here a new approach: the actual value in @JsonTypeName is set in a postProcessor

One native test does fail. I don't know why.

[jpfinne]

@wing328 thank you for your review.

The latest commit uses a lambda for useJsonTypeName.

I'm a bit scared by the amount of samples updated.

There was some differences in rust generation due to a change in DefaultCodeGen. I've rollbacked that change so that this PR has no impact on Rust.

btw I use a portable version of Gitbash on Windows. It generates cr/lf for FILES. Is there a way to configure the EOL?

[martin-mfg]

It would be great if @wing328 or someone from the Java technical committee could take over reviewing this PR; both to add another perspective and because I currently can't work on this.

[jpfinne]

It would be great if @wing328 or someone from the Java technical committee could take over reviewing this PR; both to add another perspective and because I currently can't work on this.

@wing328 now what?