alembic/env.py

import os
import asyncio
from logging.config import fileConfig

from sqlalchemy.engine import Connection
from sqlalchemy.ext.asyncio import async_engine_from_config
from sqlalchemy import pool

from alembic import context
from workout_api.contrib.models import BaseModel
from workout_api.contrib.repository.models import *

config = context.config

if config.config_file_name is not None:
    fileConfig(config.config_file_name)

target_metadata = BaseModel.metadata

def get_url():
    # Busca a DATABASE_URL do ambiente, se não encontra usa alembic.ini
    return os.getenv("DB_URL") or config.get_main_option("sqlalchemy.url")

def run_migrations_offline() -> None:
    url = get_url()
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

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

def do_run_migrations(connection: Connection) -> None:
    context.configure(connection=connection, target_metadata=target_metadata)
    with context.begin_transaction():
        context.run_migrations()

async def run_async_migrations() -> None:
    # Injeta a URL pela configuração dinâmica
    section = config.get_section(config.config_ini_section, {})
    section["sqlalchemy.url"] = get_url()
    connectable = async_engine_from_config(
        section,
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )
    async with connectable.connect() as connection:
        await connection.run_sync(do_run_migrations)

def run_migrations_online() -> None:
    asyncio.run(run_async_migrations())

if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()