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🐛 Fix unformatted {type_} in FastAPIError #14416

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Merged
tiangolo merged 4 commits into from
Dec 2, 2025
+9 −3
Merged

🐛 Fix unformatted {type_} in FastAPIError #14416

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2d24b5e
fix: formats missing `type_` argument in `FastAPIError`
Just-Helpful Nov 28, 2025
4d93897
fix: corrects bracketing
Alex-Colby Nov 28, 2025
84c1fd2
chore: formats files
Alex-Colby Nov 28, 2025
140af3f
Merge branch 'master' into master
Just-Helpful Nov 30, 2025
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12 changes: 9 additions & 3 deletions fastapi/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -110,7 +110,9 @@ def create_model_field(
try:
return v1.ModelField(**v1_kwargs) # type: ignore[no-any-return]
except RuntimeError:
raise fastapi.exceptions.FastAPIError(_invalid_args_message) from None
raise fastapi.exceptions.FastAPIError(
_invalid_args_message.format(type_=type_)
) from None
elif PYDANTIC_V2:
from ._compat import v2

Expand All @@ -121,15 +123,19 @@ def create_model_field(
try:
return v2.ModelField(**kwargs) # type: ignore[return-value,arg-type]
except PydanticSchemaGenerationError:
raise fastapi.exceptions.FastAPIError(_invalid_args_message) from None
raise fastapi.exceptions.FastAPIError(
_invalid_args_message.format(type_=type_)
) from None
# Pydantic v2 is not installed, but it's not a Pydantic v1 ModelField, it could be
# a Pydantic v1 type, like a constrained int
from fastapi._compat import v1

try:
return v1.ModelField(**v1_kwargs) # type: ignore[no-any-return]
except RuntimeError:
raise fastapi.exceptions.FastAPIError(_invalid_args_message) from None
raise fastapi.exceptions.FastAPIError(
_invalid_args_message.format(type_=type_)
) from None


def create_cloned_field(
Expand Down