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3 changes: 3 additions & 0 deletions fastapi/_compat/v2.py
Original file line number Diff line number Diff line change
Expand Up @@ -107,6 +107,9 @@ class ModelField:

@property
def alias(self) -> str:
va = self.field_info.validation_alias
if isinstance(va, str):
return va
a = self.field_info.alias
return a if a is not None else self.name

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9 changes: 8 additions & 1 deletion fastapi/dependencies/utils.py
Original file line number Diff line number Diff line change
Expand Up @@ -523,7 +523,14 @@ def analyze_param(
)
if isinstance(field_info, (params.Form, temp_pydantic_v1_params.Form)):
ensure_multipart_is_installed()
if not field_info.alias and getattr(field_info, "convert_underscores", None):
# Get validation_alias if it's a simple string (not AliasPath/AliasChoices)
validation_alias = getattr(field_info, "validation_alias", None)
if isinstance(validation_alias, str):
alias = validation_alias
elif (
not field_info.alias
and getattr(field_info, "convert_underscores", None)
):
alias = param_name.replace("_", "-")
else:
alias = field_info.alias or param_name
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