A First Look at Flask-Evolution

While poking around in Flask-Ahoy this morning I came across Flask-Evolution which I hadn't previous noticed. It offers the Django idea of migrations to the Flask community and so I thought I'd give it a go and see how it shapes up.


So let's set up a virtual environment and get the basics in place.
Now the contents of the two files you touched. First the "hello world" Flask app goes in the myapp.py file:


Next we we take the tutorial Flask-Script manage.py file and adapt it very slightly:

Now we are ready to create a simple migration for a Post model for a blog:



and you get the template file which looks like this:



In the file put your Post model and modfy "up" and "down":


Our First Migration


Our Second Migration
Now if we want to modify that Post model we can again do:


modify your model and modfy "up" and "down", I've left some comments so you can see what I did:


and run it again.


You should also play around with the "redo" and "undo" commands. That's about it really.

Conclusion
This is only version 0.6 of Flask-Evolution and it's got a way to go, but I can see some use in using it, but it's far from seamless and it's a long way from South.

Documentation is woeful and I'm not convinced the developer Adam Patterson has the time to do the job he'd like to.

You could always offer to give him a hand!

If you see anything wrong with what I've written here or if you spot spelling or other mistakes then please let me know.

Good luck fellow traveller.