[Bug]: OpenAPI generator version 7.10 is not working with swagger 2 and allOf with only one element

[matthieu-crouzet]

Package name

schematics

Package version

11.6.0-rc

Reproduction steps

Generate a SDK with a specification containing an API using only once a model.
This model should be defined by the following format:

ModelWithIssue:
  type: object
  description: 'model with issue'
  allOf:
    - $ref: '#/definitions/ValidModel

Current result

The SDK is generated but the import of ModelWithIssue is missing in the api file.
So build task is not working.

Expected result

Import should be present and build task should run successfully

Additional comments

Issue appears with OpenAPI generator version 7.10, track on their side with this issue.

On our side we disabled the upgrade of OpenAPI generator with renovate.
It could be reactivated once we have added an integration test that generate a SDK with this specificity in the specification.
So we would be able to see easily when the issue will be fixed thanks to renovate.

[kpanot]

As discussed, the mitigation is to:

• Create an IT scenario generating an SDK based on a Swagger 2 spec including the described spec producing the issue
• Re-enable the Renovate upgrading the generator version (disabled in fix(ama-sdk): fallback open api generator version to 7.9.0 #2671)