# generated by datamodel-codegen:
#   filename:  type_alias_chain_union_default_object_ref.json
#   timestamp: 2019-07-26T00:00:00+00:00

from __future__ import annotations

from typing import Annotated, Literal

from pydantic import BaseModel, Field


class A(BaseModel):
    type: Literal['a'] = 'a'


class B(BaseModel):
    type: Literal['b'] = 'b'


type Alias1 = A | B


type Alias2 = Alias1


class Model(BaseModel):
    x_value: Annotated[Alias2 | None, Field(validate_default=True)] = {'type': 'b'}
