[BUG] [Python] Regression on UUID types

[dojeda]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

A regression on v4.0.0-beta2 or latest fails during code generation when a

openapi-generator version

v4.0.0-beta2

OpenAPI declaration file content or url

---
openapi: 3.0.2

info:
  title: My API
  version: 0.1.0
  description: Some description

paths:
  /files/:
    post:
      summary: Upload file.
      operationId: upload_file
      requestBody:
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                file_content:
                  type: string
                  format: binary
      responses:
        '201':
          $ref: '#/components/responses/FileDetails'
components:
  schemas:
    BaseMetadata:
      type: object
      required:
        - id
        - url
      properties:
        id:
          description: File identifier.
          type: string
          format: uuid
          example: d06861a5-a14c-449c-bc9a-8f547186286a
        url:
          description: File URL
          type: string
          format: url
          example: gs://data-bucket/d06861a5-a14c-449c-bc9a-8f547186286a

  responses:
    FileDetails:
      description: File details.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/BaseMetadata'

Command line used for generation

The following command fails:

$ docker run --rm -v $PWD/tmp:/local openapitools/openapi-generator-cli:v4.0.0-beta2 generate -i /local/bug.yaml -g python -o /tmp/

[main] INFO  o.o.c.ignore.CodegenIgnoreProcessor - No .openapi-generator-ignore file found.
[main] INFO  o.o.c.languages.PythonClientCodegen - Environment variable PYTHON_POST_PROCESS_FILE not defined so the Python code may not be properly formatted. To define it, try 'export PYTHON_POST_PROCESS_FILE="/usr/local/bin/yapf -i"' (Linux/Mac)
[main] INFO  o.o.c.languages.PythonClientCodegen - NOTE: To enable file post-processing, 'enablePostProcessFile' must be set to `true` (--enable-post-process-file for CLI).
[main] WARN  o.o.codegen.utils.URLPathUtils - 'host' (OAS 2.0) or 'servers' (OAS 3.0) not defined in the spec. Default to [http://localhost] for server URL [http://localhost/]
[main] WARN  o.o.codegen.utils.URLPathUtils - 'host' (OAS 2.0) or 'servers' (OAS 3.0) not defined in the spec. Default to [http://localhost] for server URL [http://localhost/]
Exception in thread "main" java.lang.RuntimeException: Could not process model 'BaseMetadata'.Please make sure that your schema is correct!
        at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:454)
        at org.openapitools.codegen.DefaultGenerator.generate(DefaultGenerator.java:897)
        at org.openapitools.codegen.cmd.Generate.run(Generate.java:354)
        at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:61)
Caused by: java.lang.ClassCastException: java.util.UUID cannot be cast to java.lang.String
        at org.openapitools.codegen.languages.PythonClientCodegen.toDefaultValue(PythonClientCodegen.java:657)
        at org.openapitools.codegen.DefaultCodegen.fromProperty(DefaultCodegen.java:1878)
        at org.openapitools.codegen.DefaultCodegen.addVars(DefaultCodegen.java:3449)
        at org.openapitools.codegen.DefaultCodegen.addVars(DefaultCodegen.java:3397)
        at org.openapitools.codegen.DefaultCodegen.fromModel(DefaultCodegen.java:1748)
        at org.openapitools.codegen.DefaultGenerator.processModels(DefaultGenerator.java:1138)
        at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:449)

However, the previous version succeeds:

docker run --rm -v $PWD/tmp:/local openapitools/openapi-generator-cli:v4.0.0-beta generate -i /local/bug.yaml -g python -o /tmp/
... no errors ...

Steps to reproduce

1. Download minimum working example
2. Run docker image to generate code with v4.0.0-beta2 tag or latest as shown on the example above.

Related issues/PRs

Suggest a fix

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[dojeda]

After a git bisect, I pinned down this regression to 539ec23 by @spacether and its associated PR: #1776

[wing328]

@dojeda thanks for reporting the issue and doing a "git bisect" to identify the associated PR, I'll take a look later today.

[wing328]

@dojeda I've filed #2213 to fix the issue. Tested with your spec and no NPE was thrown.

➜  openapi-generator git:(fix_example) java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -g python -i /tmp/example.yaml -o /tmp/example/
[main] WARN  o.o.c.ignore.CodegenIgnoreProcessor - Output directory does not exist, or is inaccessible. No file (.openapi-generator-ignore) will be evaluated.
[main] INFO  o.o.c.languages.PythonClientCodegen - Environment variable PYTHON_POST_PROCESS_FILE not defined so the Python code may not be properly formatted. To define it, try 'export PYTHON_POST_PROCESS_FILE="/usr/local/bin/yapf -i"' (Linux/Mac)
[main] INFO  o.o.c.languages.PythonClientCodegen - NOTE: To enable file post-processing, 'enablePostProcessFile' must be set to `true` (--enable-post-process-file for CLI).
[main] WARN  o.o.codegen.utils.URLPathUtils - 'host' (OAS 2.0) or 'servers' (OAS 3.0) not defined in the spec. Default to [http://localhost] for server URL [http://localhost/]
[main] WARN  o.o.codegen.utils.URLPathUtils - 'host' (OAS 2.0) or 'servers' (OAS 3.0) not defined in the spec. Default to [http://localhost] for server URL [http://localhost/]
[main] INFO  o.o.codegen.DefaultGenerator - Model inline_object (marked as unused due to form parameters) is generated due to skipFormModel=false (default)
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/openapi_client/models/base_metadata.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/test/test_base_metadata.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/docs/BaseMetadata.md
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/openapi_client/models/inline_object.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/test/test_inline_object.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/docs/InlineObject.md
[main] WARN  o.o.codegen.utils.URLPathUtils - 'host' (OAS 2.0) or 'servers' (OAS 3.0) not defined in the spec. Default to [http://localhost] for server URL [http://localhost/]
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/openapi_client/api/default_api.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/test/test_default_api.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/docs/DefaultApi.md
[main] WARN  o.o.codegen.utils.URLPathUtils - 'host' (OAS 2.0) or 'servers' (OAS 3.0) not defined in the spec. Default to [http://localhost] for server URL [http://localhost/]
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/README.md
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/tox.ini
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/test-requirements.txt
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/requirements.txt
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/git_push.sh
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/.gitignore
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/.travis.yml
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/setup.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/openapi_client/configuration.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/openapi_client/__init__.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/openapi_client/models/__init__.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/openapi_client/api/__init__.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/test/__init__.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/openapi_client/api_client.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/openapi_client/rest.py
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/.openapi-generator-ignore
[main] INFO  o.o.codegen.AbstractGenerator - writing file /tmp/example/.openapi-generator/VERSION

Btw, there're some warnings that you may want to take a look.

[dojeda]

Excellent! Thanks a lot for your help. I've tried #1776 and it did work great.

Thanks for the warning on the warnings; I stripped down most of my specification to keep it as small as possible, but by doing so I removed some general info.

[wing328]

The fix has been merged into master. Please pull the latest to give it a try.

[karismann]

@wing328 We still have the issue in the last 4.0.0-SNAPSHOT (63eb929)
That must explain the shippable error on build

java -jar ./modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -i modules/openapi-generator/src/test/resources/2_0/petstore-with-fake-endpoints-models-for-testing.yaml -g r -o /tmp/openap i-generator-test-fake-petstore/2.0/r

Exception in thread "main" java.lang.RuntimeException: Could not process model 'format_test'.Please make sure that your schema is correct! at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:454) at org.openapitools.codegen.DefaultGenerator.generate(DefaultGenerator.java:897) at org.openapitools.codegen.cmd.Generate.run(Generate.java:354) at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:61) Caused by: java.lang.ClassCastException: java.util.UUID cannot be cast to java.lang.String at org.openapitools.codegen.languages.RClientCodegen.toDefaultValue(RClientCodegen.java:598) at org.openapitools.codegen.DefaultCodegen.fromProperty(DefaultCodegen.java:1907) at org.openapitools.codegen.DefaultCodegen.addVars(DefaultCodegen.java:3503) at org.openapitools.codegen.DefaultCodegen.addVars(DefaultCodegen.java:3451) at org.openapitools.codegen.DefaultCodegen.fromModel(DefaultCodegen.java:1777) at org.openapitools.codegen.DefaultGenerator.processModels(DefaultGenerator.java:1138) at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:449)

[wing328]

Checking...

[wing328]

@karismann I've filed #2231 to fix it.

[wing328]

UPDATE: issue with the R generator has been fixed via #2231