database.py

from typing import AsyncGenerator
from fastapi import Depends
from fastapi_users.db import SQLAlchemyUserDatabase
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from sqlalchemy.ext.declarative import DeclarativeMeta, declarative_base
from sqlalchemy.orm import sessionmaker


DATABASE_URL = "sqlite+aiosqlite:///./sql_app.db"
Base: DeclarativeMeta = declarative_base()


engine = create_async_engine(DATABASE_URL)
async_session_maker = sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)


async def create_db_and_tables():
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)


async def get_async_session() -> AsyncGenerator[AsyncSession, None]:
    async with async_session_maker() as session:
        yield session


async def get_user_db(session: AsyncSession = Depends(get_async_session)):
    from models.user import User
    yield SQLAlchemyUserDatabase(session, User)