[BUG][Python] oneOf (with multi-level inheritance) misses code generation

Created by: tomghyselinck

Description

As a workaround for #1662 (closed) I was trying to use oneOf, listing the first-level inheritance objects instead of the base type.

Unfortunately, this shows pops up another related issue:

The generated code wants to resolve an OneOfDog object, but it looks like it is not generated anywhere.

Please note that you can also see that the member fields of the Pet and Dog parent object are missing in the AngryDog (cfr. #453 (closed)).

openapi-generator version

I used OpenAPI generator CLI version 4.0.0-SNAPSHOT: https://oss.sonatype.org/content/repositories/snapshots/org/openapitools/openapi-generator-cli/4.0.0-SNAPSHOT/openapi-generator-cli-4.0.0-20181210.103357-85.jar

OpenAPI declaration file content or url

See oneOf-multi-level-inheritance.yaml in the attached zip-file: oneOf-multi-level-inheritance.zip

Command line used for generation

java -jar openapi-generator-cli-4.x.jar generate -i ./oneOf-multi-level-inheritance.yaml -g python -o ./oneOf-multi-level-inheritance/client/python

Steps to reproduce

Generate client code

See also oneOf-multi-level-inheritance.sh.

wget \
    'https://oss.sonatype.org/content/repositories/snapshots/org/openapitools/openapi-generator-cli/4.0.0-SNAPSHOT/openapi-generator-cli-4.0.0-20181210.103357-85.jar' \
    -O 'openapi-generator-cli-4.x.jar'
rm -rf ./oneOf-multi-level-inheritance/
java -jar openapi-generator-cli-4.x.jar generate -i ./oneOf-multi-level-inheritance.yaml -g python -o ./oneOf-multi-level-inheritance/client/python

Start (mocked) server

python3 -m connexion run --mock=all oneOf-multi-level-inheritance.yaml

Run the client test

(cd multi-level-inheritance/client/python/ && python3)

import openapi_client
api = openapi_client.DefaultApi()
dog = api.dog_get()
print(type(dog))
print(dog)
pet = api.pet_get()
print(type(pet))
print(pet)

Output:

<class 'openapi_client.models.angry_dog.AngryDog'>
{'byting': True}
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/tom/programming/XRA-31/components/software/1.x-sc_qam/xra31api-rest/issues/oneOf-multi-level-inheritance/client/python/openapi_client/api/default_api.py", line 138, in pet_get
    (data) = self.pet_get_with_http_info(**kwargs)  # noqa: E501
  File "/home/tom/programming/XRA-31/components/software/1.x-sc_qam/xra31api-rest/issues/oneOf-multi-level-inheritance/client/python/openapi_client/api/default_api.py", line 205, in pet_get_with_http_info
    collection_formats=collection_formats)
  File "/home/tom/programming/XRA-31/components/software/1.x-sc_qam/xra31api-rest/issues/oneOf-multi-level-inheritance/client/python/openapi_client/api_client.py", line 335, in call_api
 _preload_content, _request_timeout)
  File "/home/tom/programming/XRA-31/components/software/1.x-sc_qam/xra31api-rest/issues/oneOf-multi-level-inheritance/client/python/openapi_client/api_client.py", line 174, in __call_api
    return_data = self.deserialize(response_data, response_type)
  File "/home/tom/programming/XRA-31/components/software/1.x-sc_qam/xra31api-rest/issues/oneOf-multi-level-inheritance/client/python/openapi_client/api_client.py", line 246, in deserialize
    return self.__deserialize(data, response_type)
  File "/home/tom/programming/XRA-31/components/software/1.x-sc_qam/xra31api-rest/issues/oneOf-multi-level-inheritance/client/python/openapi_client/api_client.py", line 274, in __deserialize
 klass = getattr(openapi_client.models, klass)
AttributeError: module 'openapi_client.models' has no attribute 'OneOfDog'

Related issues/PRs

Suggest a fix

I have no clue here (yet)