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"""The base classes for ORM models."""
import re
from datetime import datetime
from uuid import UUID
from pydantic import BaseModel
from sqlalchemy.ext.asyncio import AsyncAttrs
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
from sqlalchemy.schema import MetaData
from sqlalchemy.sql import func, text
from sqlalchemy.types import DateTime
NAMING_CONVENTIONS = {
"ix": "%(column_0_label)s_ix",
"uq": "%(table_name)s_%(column_0_name)s_uq",
"ck": "%(table_name)s_%(constraint_name)s_ck",
"fk": "%(table_name)s_%(column_0_name)s_%(referred_table_name)s_fk",
"pk": "%(table_name)s_pk",
}
table_name_regexp = re.compile("((?<=[a-z0-9])[A-Z]|(?!^)[A-Z](?=[a-z]))")
class Base(AsyncAttrs, DeclarativeBase):
"""Classes that inherit this class will be automatically mapped using declarative mapping."""
metadata = MetaData(naming_convention=NAMING_CONVENTIONS)
def patch_from_pydantic(self, pydantic_model: BaseModel) -> None:
"""Patch this model using the given pydantic model, unspecified attributes remain the same."""
for key, value in pydantic_model.model_dump(exclude_unset=True).items():
setattr(self, key, value)
class UUIDBase:
"""Adds a pre-populated UUID as the tables PK."""
id: Mapped[UUID] = mapped_column(server_default=text("gen_random_uuid()"), primary_key=True)
class AuditBase:
"""Common columns for a table with UUID PK and datetime audit columns."""
created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
updated_at: Mapped[datetime] = mapped_column(
DateTime(timezone=True),
server_default=func.now(),
onupdate=func.now(),
)
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