didier/alembic/env.py

import asyncio
from logging.config import fileConfig

from sqlalchemy.ext.asyncio import AsyncEngine

from alembic import context
from database.engine import postgres_engine
from database.models import Base

# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config

# Interpret the config file for Python logging.
# This line sets up loggers basically.
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

target_metadata = Base.metadata


def do_run_migrations(connection):
    context.configure(connection=connection, target_metadata=target_metadata, render_as_batch=True)

    with context.begin_transaction():
        context.run_migrations()


async def run_async_migrations(connectable: AsyncEngine):
    async with connectable.connect() as connection:
        await connection.run_sync(do_run_migrations)

    await connectable.dispose()


def run_migrations_online() -> None:
    """Run migrations in 'online' mode.

    In this scenario we need to create an Engine
    and associate a connection with the context.

    """
    connectable = context.config.attributes.get("connection", None) or postgres_engine

    if isinstance(connectable, AsyncEngine):
        asyncio.run(run_async_migrations(connectable))
    else:
        do_run_migrations(connectable)


run_migrations_online()