84 lines
2.7 KiB
Python
84 lines
2.7 KiB
Python
from datetime import datetime
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from typing import Optional
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from sqlalchemy import Boolean, DateTime, String, func, text
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from sqlalchemy.orm import (
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DeclarativeBase,
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Mapped,
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declarative_mixin,
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declared_attr,
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mapped_column,
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)
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class Base(DeclarativeBase):
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"""absolute base for sqlalchemy classes"""
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@declarative_mixin
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class CommonSqlalchemyMetaMixins(Base):
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__abstract__ = True
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created_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), server_default=func.now())
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updated_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), server_default=func.now(), server_onupdate=func.now())
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is_deleted: Mapped[bool] = mapped_column(Boolean, server_default=text("FALSE"))
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def _set_created_and_updated_by_fields(self, actor_id: str) -> None:
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"""Populate created_by_id and last_updated_by_id based on actor."""
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if not self.created_by_id:
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self.created_by_id = actor_id
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# Always set the last_updated_by_id when updating
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self.last_updated_by_id = actor_id
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@declared_attr
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def _created_by_id(cls):
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return cls._user_by_id()
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@declared_attr
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def _last_updated_by_id(cls):
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return cls._user_by_id()
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@classmethod
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def _user_by_id(cls):
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"""a flexible non-constrained record of a user.
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This way users can get added, deleted etc without history freaking out
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"""
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return mapped_column(String, nullable=True)
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@property
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def last_updated_by_id(self) -> Optional[str]:
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return self._user_id_getter("last_updated")
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@last_updated_by_id.setter
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def last_updated_by_id(self, value: str) -> None:
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self._user_id_setter("last_updated", value)
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@property
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def created_by_id(self) -> Optional[str]:
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return self._user_id_getter("created")
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@created_by_id.setter
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def created_by_id(self, value: str) -> None:
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self._user_id_setter("created", value)
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def _user_id_getter(self, prop: str) -> Optional[str]:
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"""returns the user id for the specified property"""
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full_prop = f"_{prop}_by_id"
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prop_value = getattr(self, full_prop, None)
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if not prop_value:
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return
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return prop_value
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def _user_id_setter(self, prop: str, value: str) -> None:
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"""returns the user id for the specified property"""
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full_prop = f"_{prop}_by_id"
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if not value:
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setattr(self, full_prop, None)
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return
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# Safety check
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prefix, id_ = value.split("-", 1)
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assert prefix == "user", f"{prefix} is not a valid id prefix for a user id"
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# Set the full value
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setattr(self, full_prop, value)
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