97 lines
2.8 KiB
Python
97 lines
2.8 KiB
Python
from typing import TypeVar, Generic, Type, Sequence
|
|
from sqlalchemy.ext.asyncio import AsyncSession
|
|
from sqlalchemy import select, delete as sa_delete, update as sa_update, ColumnElement
|
|
from sqlalchemy.exc import IntegrityError
|
|
from sqlalchemy.orm.exc import StaleDataError
|
|
from sqlalchemy.sql import Select
|
|
from fooder.domain import Base
|
|
from fooder.exc import Conflict, NotFound
|
|
from fooder.utils.datetime import utc_now
|
|
|
|
T = TypeVar("T", bound=Base)
|
|
|
|
|
|
DEFAULT_LIMIT = 20
|
|
|
|
|
|
class RepositoryBase(Generic[T]):
|
|
def __init__(self, model: Type[T], session: AsyncSession):
|
|
self.model = model
|
|
self.session = session
|
|
|
|
def _build_select(self, *expressions: ColumnElement) -> Select[tuple[T]]:
|
|
stmt = select(self.model)
|
|
|
|
if hasattr(self.model, "deleted_at"):
|
|
stmt = stmt.where(self.model.deleted_at.is_(None)) # type: ignore[attr-defined]
|
|
|
|
if expressions:
|
|
stmt = stmt.where(*expressions)
|
|
|
|
return stmt
|
|
|
|
async def _get(self, *expressions: ColumnElement) -> T:
|
|
stmt = self._build_select(*expressions)
|
|
result = await self.session.execute(stmt)
|
|
obj = result.scalar_one_or_none()
|
|
|
|
if obj is None:
|
|
raise NotFound()
|
|
|
|
return obj
|
|
|
|
async def _get_for_update(self, *expressions: ColumnElement) -> T:
|
|
stmt = self._build_select(*expressions).with_for_update()
|
|
result = await self.session.execute(stmt)
|
|
obj = result.scalar_one_or_none()
|
|
|
|
if obj is None:
|
|
raise NotFound()
|
|
|
|
return obj
|
|
|
|
async def _list(
|
|
self,
|
|
*expressions: ColumnElement,
|
|
offset: int = 0,
|
|
limit: int | None = DEFAULT_LIMIT
|
|
) -> Sequence[T]:
|
|
stmt = self._build_select(*expressions)
|
|
|
|
if offset:
|
|
stmt = stmt.offset(offset)
|
|
|
|
if limit is not None:
|
|
stmt = stmt.limit(limit)
|
|
|
|
result = await self.session.execute(stmt)
|
|
return result.scalars().all()
|
|
|
|
async def create(self, obj: T) -> T:
|
|
self.session.add(obj)
|
|
try:
|
|
await self.session.flush()
|
|
except IntegrityError:
|
|
raise Conflict()
|
|
await self.session.refresh(obj)
|
|
return obj
|
|
|
|
async def update(self, obj: T) -> T:
|
|
try:
|
|
await self.session.flush()
|
|
except IntegrityError:
|
|
raise Conflict()
|
|
except StaleDataError:
|
|
raise Conflict()
|
|
return obj
|
|
|
|
async def _delete(self, *expressions: ColumnElement):
|
|
if hasattr(self.model, "deleted_at"):
|
|
stmt = sa_update(self.model).values(deleted_at=utc_now()) # type: ignore[attr-defined]
|
|
else:
|
|
stmt = sa_delete(self.model)
|
|
|
|
if expressions:
|
|
stmt = stmt.where(*expressions)
|
|
|
|
await self.session.execute(stmt)
|