arbret/backend/database.py

import os

from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
from sqlalchemy.orm import DeclarativeBase

DATABASE_URL = os.getenv(
    "DATABASE_URL", "postgresql+asyncpg://postgres:postgres@localhost:5432/arbret"
)

# asyncpg needs postgresql:// instead of postgresql+asyncpg://
ASYNCPG_DATABASE_URL = DATABASE_URL.replace("postgresql+asyncpg://", "postgresql://")

engine = create_async_engine(DATABASE_URL)
async_session = async_sessionmaker(engine, expire_on_commit=False)


class Base(DeclarativeBase):
    pass


async def get_db():
    async with async_session() as session:
        yield session