[REQ][Bounty] AnyOf - OneOf - AllOf support

[leus]

Is your feature request related to a problem? Please describe.

Nowadays many popular OpenAPI specifications describe objects using oneOf / anyOf / allOf keywords. Regardless if this was a good or a bad idea, the OpenAPI generator should support this to avoid having to resort to manual fixes in build chains.

Describe the solution you'd like

Full support for these keywords in all generators.

Describe alternatives you've considered

Right now the only feasible workaround is to manually remove all of the methods that use these schema combine keywords or to implement them by hand in the generated code. This is obviously not ideal.

Additional context

This has been reported in many occassions before: #10450, #10352, #9858 , #9684, #9443, #2906, #5381, #8647, #8860, #9601, #9981, #9305, #9301, #9163, #8860, and many more.

[leus]

I'm creating this in order to gain traction to get sponsorship for this work.

[flipch]

Given that currently different return objects for status code is non existent this is the other alternative.

[leus]

Given that currently different return objects for status code is non existent this is the other alternative.

Sorry - which alternative?

[c0dezli]

Yep this is very frustrating, the community has been asking this for a long time...

[Mehly]

This is indeed very frustrating. But at least it's on the "short-term roadmap" of OpenAPI generator :

Short term are focused on improving contributor and user productivity (part of this is getting the word out).

• [...]
• OAS3.0 features support: anyOf, oneOf, callbacks, etc"

I hope they provide support for it real soon :)

[mariodsantana]

I've opened #10812 and now realize it's really just a python-specific subset of this. That ticket has a $1,000 bounty for now, in case someone's monitoring this issue and needs a little motivation. :D

[Dizzzmas]

+1 for this feature

Encountered this today when trying to generate TypeScript client code via ts-axios generator with oneOf in the OpenApi specification.

The generated code includes this unnecessary broken import which fails compilation of the client library:

import { |MyDto } from './|my-dto';

[vpishuk]

oneOf works in my case. But anyOf simply takes the last model's attributes instead of composing all of them.

[vpishuk]

I have an MR to fix anyOf generation for typesciprt-axios generator: #14241

[lrebscher]

Is there an update on when the feature can be supported?

Since the requested feature has been on the short-term roadmap for over 2 years, I have the feeling that it has been abandoned.

We use the typescript-angular generator in our projects and have to decide whether to replace it with another generator that supports anyOf (e.g. openapi-ts), or stick to workarounds in the hope that openapi-generator will support it soon.

[XaviPeiro]

Any update?