from typing import Any
from sqlalchemy import Integer, insert_sentinel
from sqlalchemy.orm import Mapped, declared_attr, mapped_column
def _create_sentinel_column(_cls: Any) -> Mapped[int]:
return mapped_column(
Integer,
name="sa_orm_sentinel",
insert_default=insert_sentinel().default,
_omit_from_statements=True,
insert_sentinel=True,
use_existing_column=True,
nullable=True,
sort_order=3001,
)
_create_sentinel_column.__annotations__.clear()
[docs]
class SentinelMixin:
"""Mixin to add a sentinel column for SQLAlchemy models."""
__abstract__ = True
_sentinel = declared_attr(_create_sentinel_column)
