[General] default value of enum property that are $ref-ed is not recognized

[fujigon]

Description

openapi-generator doesn't recognize default value of enum property that are $ref-ed.

openapi-generator version

current master eb4dfe0

OpenAPI declaration file content or url

https://gist.github.com/fujigon/4ae17fc6497cb599d1dfb53c2ebeadea#file-openapi-yaml

Command line used for generation

# git clone, etc
mvn package
java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -i my-api-spec/openapi.yaml -g jaxrs-jersey -o generated-code/ -v

Steps to reproduce

When I execute the generator with the gisted openapi.yaml file, I get
https://gist.github.com/fujigon/4ae17fc6497cb599d1dfb53c2ebeadea#file-inlineresponsedefault-java

The problem is that default value of enum property that are $ref-ed is null

https://gist.github.com/fujigon/4ae17fc6497cb599d1dfb53c2ebeadea#file-inlineresponsedefault-java-L39

Related issues/PRs

Suggest a fix/enhancement

I investigated and found that https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/java/org/openapitools/codegen/utils/ModelUtils.java#L703 is the problem.

current implementation of unaliasSchema method doesn't return the ref-resolved schema.

I'm working to file the PR to fix this issue.

[jmini]

It sounds like #1981 what I have tried to address with #2001

During my tests and for @ajdergute it seems to work.

So we need to understand what additional case you need to support.

[fujigon]

I confirmed that following up issue #2127 is fixed and now this issue is completely resolved.

Thanks for support! :)