Alembic | ️ Extract a color palette from Sketch images | Plugin library

There should be info about that in Advanced user guide soon with better explanation than mine but here is how I made Alimbic migrations work.

First of all run alembic init migrations in your console to generate migrations folder. Inside migrations folder should be empty versions subfolder,env.py file, script.py.mako file. In script.py.mako file we should add line import sqlmodel somewhere around these two lines

I found a solution myself, its actually quite simple. When calling the upgrade command from the test fixture, I set two additional config values as follows:

To answer this question we need to understand how the alembic works. Basically when you run alembic revision it creates a revision and holds revisionid and down_revision then line them like a queue... And if you check your database you see the latest revision id in the alembic_version table. Each revision needs a file to handle the migrations so you cant have a revision without it's related file... Because how then alembic can auto migrate to the latest revision from base when rebuilding the project ? it's like a missing piece of puzzle.

So long story short No you can't have a revision without a file related to it.

P.S. About Django and other frameworks, they have a pretty powerful migration script so it handles the migrations. In this case the framework's migrator inspect your models file and see there are no changes so it creates no revisions! That's why you don't see any change not in migrations folder and not in alembic_version table of your database.

I had to import the metada of the Table I manually defined

In my case I used Transformer BERT model to deploy on FastApi, but fastapi wasnt able to recognise my model, as well as not taking the Model inputs and outputs. Code I used for my Case:

I would suggest using dotenv (pip install python-dotenv) like so:

Flask-Migrate, or rather Alembic, will not autodetect anonymous constraints. But you can create a manual Alembic migration file to drop the constraint.

Create an empty migration file:

Is this the expected behavior or it has something to do with my architecture?

This is the expected behavior. Command alembic revision --autogenerate always creates a new migration file. If no changes exist than it creates an empty one.

You can use alembic-autogen-check to check if your migrations is in sync with models.

I made it work (for now) by manually fetching the config value from Vault backend and creating the engine, instead of using settings.engine.connect(). Here is my wait-for-migration-command template