72 lines
2 KiB
Python
72 lines
2 KiB
Python
from typing import TypeVar, Generic, Type, Sequence
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from sqlalchemy.ext.asyncio import AsyncSession
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from sqlalchemy import select, delete as sa_delete, ColumnElement
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from sqlalchemy.exc import IntegrityError
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from sqlalchemy.sql import Select
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from fooder.domain import Base
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from fooder.exc import Conflict, NotFound
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T = TypeVar("T", bound=Base)
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DEFAULT_LIMIT = 20
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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: ColumnElement) -> 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: ColumnElement) -> T:
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stmt = self._build_select(*expressions)
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result = await self.session.execute(stmt)
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obj = result.scalar_one_or_none()
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if obj is None:
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raise NotFound()
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return obj
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async def _list(self, *expressions: ColumnElement, offset: int = 0, limit: int | None = DEFAULT_LIMIT) -> Sequence[T]:
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stmt = self._build_select(*expressions)
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if offset:
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stmt = stmt.offset(offset)
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if limit is not None:
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stmt = stmt.limit(limit)
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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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try:
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await self.session.flush()
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except IntegrityError:
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raise Conflict()
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await self.session.refresh(obj)
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return obj
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async def update(self, obj: T) -> T:
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try:
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await self.session.flush()
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except IntegrityError:
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raise Conflict()
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return obj
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async def _delete(self, *expressions: ColumnElement):
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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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