[BUG] [HTML2] oneOf in response generates empty response schema in html

[pbarnes-tibco]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

A response or a request body with oneOf generates empty response schema, and mostly empty/incomplete body parameters schema with the html2 generator.

openapi-generator version

Using 5.4.0. Also reproduced in 6.0.0 and master. 6.0.1 has an additional problem with a JavaScript syntax error, which appears to have been fixed in master already, so wasn't able to test there.

OpenAPI declaration file content or url

minimal spec to repro it here: https://gist.github.com/pbarnes-tibco/fc6320658db878262a1adc3696ea06ec

Generation Details

use the above linked openapi.yaml and run as:
openapi-generator-cli generate -g html2 -i openapi.yaml -o generated

Steps to reproduce

Generate the html doc with the above. Open in e.g. chrome and notice that the getPets response schema is empty, and the createPet body parameter section has no detail. There are errors in the dev tools console like

index.html:11 Uncaught TypeError: Cannot read properties of null (reading 'appendChild')
    at index.js:16:36
    at Array.forEach (<anonymous>)
    at JSONSchemaView.appendXOf (index.js:16:36)
    at JSONSchemaView.appendChildren (index.js:366:4)
    at JSONSchemaView.render (index.js:320:10)
    at HTMLDocument.<anonymous> (index.html:1233:22)
    at j (index.html:11:29568)
    at k (index.html:11:29882)

Related issues/PRs

Suggest a fix

oneOf should be allowed in response or body parameter. For us, especially in the response. We have a number of operations which can return one of a number of classes deriving from a common base model, as seen in this example.

[wing328]

@pbarnes-tibco thanks for reporting the issue. I don't think it supports oneOf, anyOf yet. We welcome PRs to enhance that.