49 lines
1.4 KiB
Python
49 lines
1.4 KiB
Python
from typing import TypeVar, Generic, Type, Any, Sequence
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from sqlalchemy.ext.asyncio import AsyncSession
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from sqlalchemy import (
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select,
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update as sa_update,
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delete as sa_delete,
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BinaryExpression,
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)
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from sqlalchemy.sql import Select
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T = TypeVar("T")
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class RepositoryBase(Generic[T]):
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def __init__(self, model: Type[T], session: AsyncSession):
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self.model = model
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self.session = session
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def _build_select(self, *expressions: BinaryExpression) -> Select[tuple[T]]:
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stmt = select(self.model)
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if expressions:
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stmt = stmt.where(*expressions)
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return stmt
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async def get(self, *expressions: BinaryExpression) -> T | None:
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stmt = self._build_select(*expressions)
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result = await self.session.execute(stmt)
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return result.scalar_one_or_none()
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async def list(self, *expressions: BinaryExpression) -> Sequence[T]:
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stmt = self._build_select(*expressions)
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result = await self.session.execute(stmt)
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return result.scalars().all()
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async def create(self, obj: T) -> T:
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self.session.add(obj)
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await self.session.flush()
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await self.session.refresh(obj)
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return obj
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async def delete(self, *expressions: BinaryExpression):
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stmt = sa_delete(self.model)
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if expressions:
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stmt = stmt.where(*expressions)
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await self.session.execute(stmt)
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