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Fix: 'ModelField' object has no attribute 'annotation' #2163

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4 changes: 2 additions & 2 deletions src/openai/_models.py
Original file line number Diff line number Diff line change
Expand Up @@ -652,8 +652,8 @@ def _build_discriminated_union_meta(*, union: type, meta_annotations: tuple[Any,
# Note: if one variant defines an alias then they all should
discriminator_alias = field_info.alias

if field_info.annotation and is_literal_type(field_info.annotation):
for entry in get_args(field_info.annotation):
if (annotation := getattr(field_info, 'annotation', None)) and is_literal_type(annotation):
for entry in get_args(annotation):
if isinstance(entry, str):
mapping[entry] = variant

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