Incorrect parsing of null as nullable enum value serialized as strings

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#1,243 opened on Apr 9, 2025 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: openapi, python
Domain: api

Research direction

Reproduce the nullable enum case from the issue using the openapi-python-client 0.23.1 behavior and the shown generated deserialization code. Start at the handling of deviceEncryptionKeyScheme after d.pop; compare the UNSET path with the null path. Done means an explicitly null value deserializes successfully while an unset property remains represented as UNSET.

Written by the indexing model from the issue text.

Description

Consider the following schema definition (which passes validation with the openapitools/openapi-generator-cli container image):

// [...]
          "deviceEncryptionKeyScheme": {
            "$ref": "#/components/schemas/DeviceEncryptionKeyScheme",
            "nullable": true  // <-- nullability declared
          },

// [...]
      "DeviceEncryptionKeyScheme": {
        "enum": ["Default8"],
        "type": "string"
      },

It looks as if openapi-python-client version 0.23.1 supports deserialization with the deviceEncryptionKeyScheme property being unset, but not it being null:

        _device_encryption_key_scheme = d.pop("deviceEncryptionKeyScheme", UNSET)
        device_encryption_key_scheme: Union[Unset, DeviceEncryptionKeyScheme]
        if isinstance(_device_encryption_key_scheme, Unset):
            device_encryption_key_scheme = UNSET
        else:
            device_encryption_key_scheme = DeviceEncryptionKeyScheme(_device_encryption_key_scheme)

This looks like a bug to me.

Dominant language: Python
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Merged PRs (30d): 1

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