Is it possible to store the alembic connect string outside of alembic.ini?

Question

I\'m using Alembic with SQL Alchemy. With SQL Alchemy, I tend to follow a pattern where I don\'t store the connect string with the versioned code. Instead I have file secr

Answer 1

Alembic documentation suggests using create_engine with the database URL (instead of modifying sqlalchemy.url in code).

Also you should modify run_migrations_offline to use the new URL. Allan Simon has an example on his blog, but in summary, modify env.py to:

1. Provide a shared function to get the URL somehow (here it comes from the command line):

   def get_url():
       url = context.get_x_argument(as_dictionary=True).get('url')
       assert url, "Database URL must be specified on command line with -x url="
       return url
   

2. Use the URL in offline mode:

   def run_migrations_offline():
       ...
       url = get_url()
       context.configure(
           url=url, target_metadata=target_metadata, literal_binds=True)
       ...
   

3. Use the URL in online mode by using create_engine instead of engine_from_config:

   def run_migrations_online():
       ...
       connectable = create_engine(get_url())
       with connectable.connect() as connection:
       ...