Generate OpenAI OpenAPI for python pydantic2.datamodel

[guenhter]

Hi,

when I run:

OPENAPI_URL="https://app.stainless.com/api/spec/documented/openai/openapi.documented.yml"
OPENAPI_FILE="./openapi.documented.yml"

echo "Downloading OpenAPI spec from $OPENAPI_URL..."
curl -s --fail-with-body -o "$OPENAPI_FILE" "$OPENAPI_URL"

# Generate Python models using datamodel-code-generator
OUTPUT_FILE="./openapi_models.py"

echo "Generating Python models..."

# Run datamodel-code-generator with basic options similar to the main models
uv run datamodel-codegen \
    --input "$OPENAPI_FILE" \
    --output "$OUTPUT_FILE" \
    --output-model-type pydantic_v2.BaseModel \
    --formatters ruff-format \
    --input-file-type openapi

Then the models are generated, but when using them, I get this error:

_schema
    raise PydanticUserError(
E   pydantic.errors.PydanticUserError: Model 'FineTuningIntegration' needs field 'type' to be of type `Literal`
E   
E   For further information visit https://errors.pydantic.dev/2.12/u/discriminator-needs-literal

I now struggle where the error lies: is it a missing CLI argument when running the generator, is it a flaw in the openapi spec or something else? Can somebody with some more knowlege then me support me here to successfully geneate usable files?

[ilovelinux]

Hi! I can replicate with v.0.53.0 and it looks like a bug caused by an unhanded sub-case. Can you open an issue about that?

Thanks for reporting!