mitlist/be/alembic/env.py
mohamad 7223606fdc
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refactor: Update Alembic migration functions to support asynchronous execution and streamline migration handling in application startup
2025-06-01 17:20:28 +02:00

96 lines
3.0 KiB
Python

from logging.config import fileConfig
import os
import sys
import asyncio
from sqlalchemy import engine_from_config
from sqlalchemy import pool
from sqlalchemy.ext.asyncio import create_async_engine
from alembic import context
# Ensure the 'app' directory is in the Python path
# Adjust the path if your project structure is different
sys.path.insert(0, os.path.realpath(os.path.join(os.path.dirname(__file__), '..')))
# Import your app's Base and settings
import app.models # Ensure all models are loaded and registered to app.database.Base
from app.database import Base as DatabaseBase # Explicitly get Base from database.py
from app.config import settings # Import settings to get DATABASE_URL
# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config
# Set the sqlalchemy.url from your application settings
# Ensure DATABASE_URL is available and use it directly
if not settings.DATABASE_URL:
raise ValueError("DATABASE_URL not found in settings for Alembic.")
config.set_main_option('sqlalchemy.url', settings.DATABASE_URL)
# 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)
# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
target_metadata = DatabaseBase.metadata # Use metadata from app.database.Base
# other values from the config, defined by the needs of env.py,
# can be acquired:
# my_important_option = config.get_main_option("my_important_option")
# ... etc.
def do_run_migrations(connection):
context.configure(
connection=connection,
target_metadata=target_metadata,
compare_type=True,
compare_server_default=True
)
with context.begin_transaction():
context.run_migrations()
async def run_migrations_online_async():
"""Run migrations in 'online' mode asynchronously."""
connectable = create_async_engine(
settings.DATABASE_URL,
poolclass=pool.NullPool,
)
async with connectable.connect() as connection:
await connection.run_sync(do_run_migrations)
await connectable.dispose()
def run_migrations_offline():
"""Run migrations in 'offline' mode.
This configures the context with just a URL
and not an Engine, though an Engine is acceptable
here as well. By skipping the Engine creation
we don't even need a DBAPI to be available.
Calls to context.execute() here emit the given string to the
script output.
"""
url = config.get_main_option("sqlalchemy.url")
context.configure(
url=url,
target_metadata=target_metadata,
literal_binds=True,
dialect_opts={"paramstyle": "named"},
)
with context.begin_transaction():
context.run_migrations()
if context.is_offline_mode():
run_migrations_offline()
else:
# Don't run migrations here - they will be run from FastAPI
pass