How do I do a migration if my backend container won't start due to an error?

[tharrington]

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Example Code

$ docker compose exec backend bash
service "backend" is not running

Description

I have an error that was caused by some model code. I have updated the models and I want to create a new migration, but the following command fails:

docker compose exec backend bash
service "backend" is not running

Looking at the logs, it's clear this is caused by my model not having a relationship done properly.

Operating System

macOS

Operating System Details

Mac M1

Python Version

3.11.2

Additional Context

No response

[eugsokolov]

see here on how to apply migrations

#324 (comment)

[YuriiMotov]

In docker-compose.override.yml comment out the following lines

    command:
      - fastapi
      - run
      - --reload
      - "app/main.py"

and uncomment the line above

    # command: sleep infinity  # Infinite loop to keep container alive doing nothing

Then run docker compose watch and in new terminal, attach to the container with docker compose exec backend bash.
Now you can see something like

root@7f2607af31c3:/app#

You are inside the backend container and can run alembic commands

Docs: https://github.com/fastapi/full-stack-fastapi-template/blob/master/backend/README.md#docker-compose-override