[C++][Pistache-Server] Creation of weird #include statements from oneOf-statement

Created by: jochengern

Description

If I use a schema definition as shown in the yaml-snippet below, I get a file Error.h that contains the following #include statement: #include OneOfErrInternalErrorErrInvalidIdErrCurrentlyNotAllowedErrApplicationNotLoadableErrApplicationNotAvailableErrItemDoesNotExist.h" that will never compile because such a file does not exist. It also contains the following method-declrarations: OneOfErrInternalErrorErrInvalidIdErrCurrentlyNotAllowedErrApplicationNotLoadableErrApplicationNotAvailableErrItemDoesNotExist getCode() const; void setCode(OneOfErrInternalErrorErrInvalidIdErrCurrentlyNotAllowedErrApplicationNotLoadableErrApplicationNotAvailableErrItemDoesNotExist const& value);

Neither while validating the yaml that contains this schema does issue an error message nor does the creation process.

openapi-generator version

4.0.0-beta2

OpenAPI declaration file content or url

'''yaml components: schemas: Error: type: object required: - code - message properties: code: oneOf: - $ref: '#/components/schemas/ErrInternalError' - $ref: '#/components/schemas/ErrInvalidId' - $ref: '#/components/schemas/ErrCurrentlyNotAllowed' - $ref: '#/components/schemas/ErrApplicationNotLoadable' - $ref: '#/components/schemas/ErrApplicationNotAvailable' - $ref: '#/components/schemas/ErrItemDoesNotExist' message: type: string '''

Command line used for generation

java -ea -Xms512M -Xmx1024M -server -jar /home/fili/alpine/gernjo/openAPI/openapi-generator-cli-4.0.0-beta2.jar generate -i ./ontrestapi_device/ore_device.yaml -g cpp-pistache-server -o ./generated_server

Suggest a fix

• Create one include-statement for each of the items listed under oneOf
• Create one specific setter/getter method for each of the items listed under oneOf