Getting started...
This is just a quick example of creating a development testing flask app using flask-sqlalchemy and a postgres database running in a docker environment using docker compose. If you plan in using flask in production use gunicorn or the like to serve the application behind a reverse proxy like nginx or apache. I will not cover how to do that here, the internet is a big place with plenty of examples how this can be done.
I did come accross some issues right now trying to run this on my m1 mbp with the latest version of postgres "sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) SCRAM authentication requires libpq version 10 or above." This seems to be a docker issue on all m1 arm machines atm.. issue: [Github Issue](psycopg/psycopg2#1360)
Pull and Build container images.
docker-compose build
Start project
docker-compose up -d
Initalize Database
exec into python app container and initialize the database for use...
replace 'flask_todo' with your python container name if it is different or you renamed it.
docker exec -it flask_todo /bin/bash
Once inside the python container run.
flask createdb or flask initdb
The flask app is running in debug mode, so changes should reload container directly. To watch changes you can either load container with docker-compose up or just view container logs with docker logs -f flask_todo
The postgres database should servive between startups and rebuilds as we are keeping it in a local volume on the host machine.
docker volume ls will show you volumes on your machine. To remove/delete a volume use docker volume rm <VOLUME_NAME>.