from pydantic import BaseModel, Field

class User(BaseModel):
    id: int
    username: str

class Transaction(BaseModel):
    id: str
    user: User = Field(..., exclude={'username'})

user = User(id=1, username='alice')
transaction = Transaction(id='txn_123', user=user)

print(transaction.model_dump())

# pydantic_core._pydantic_core.SchemaError: Error building `model` serializer:
#   SchemaError: Error building `model-fields` serializer:
#   TypeError: 'set' object cannot be converted to 'PyBool'

    include = extra.pop('include', None)  # type: ignore
    if include is not None:
        warn(
            '`include` is deprecated and does nothing. It will be removed, use `exclude` instead',
            PydanticDeprecatedSince20,
            stacklevel=2,
        )