from pydantic import BaseModel, Field
from typing import Annotated

IntExcludeZero = Annotated[int, Field(exclude_if=lambda v: v == 0)]

# From annotated
class Model(BaseModel):
    @computed_field
    def a_computed_field(self) -> IntExcludeZero:
        return 0

obj = Model()
print(obj.model_dump())  # {}


# From decorator arg
class Model(BaseModel):
    @computed_field(exclude_if=exclude_if=lambda v: v == 0)
    def a_computed_field(self) -> int:
        return 0
obj = Model()
print(obj.model_dump())  # {}

# This is invalid, repeated exclude_if, raises PydanticUserError
class Model(BaseModel):
    @computed_field(exclude_if=exclude_if=lambda v: v == 0)
    def a_computed_field(self) -> IntExcludeZero:
        return 0