HerokuHelpful.md

Flask-App (App with Backend written in PostgreSQL (orm-Flask-Sqlalchemy) | API | Sockets)

_{^{OS: Linux | Note: Details are not missing but it's that they are in my mind}}

• Make sure You have cors code inside your Flask API's
• Get a Heroku account and install the heroku cli.
• Push code to a GitHub repo
• requirements.txt and Procfile are must

pip freeze > requirements.txt

• Procfile
• More than 1 worker not supported | gives error that got closed for no reason and other bugs

web: gunicorn gettingstarted.wsgi
web: gunicorn -k eventlet -w 1 runner:app

heroku create AppName1
git push heroku master
heroku addons:create heroku-postgresql:hobby-dev
heroku run python # setting up database
heroku config:set STRIPE_API_KEY="ITSaSecretBABE!"
heroku pg:psql # making changes to database | UPDATE users SET admin_status=true WHERE username='admin';
heroku logs --tail

• Running Gunicorn locally: gunicorn --bind 0.0.0.0:8000 app
• When setting up database

from app import * # app is folder inside which I have my models, routes, api, sockets in a systematic format :: Target is-to import db
db.create_all() # Don't worry that you haven't written any PostgreSQL code, it's all done | details in mind, lol

• Requirements.txt (Authentication: JWT :: pyJWT can also be used | Marshmallow for serialization)

Flask
Flask-SQLAlchemy
postgres
eventlet
gunicorn
Flask-SocketIO
flask-cors
flask-heroku
pyjwt==1.4.2 | pyJWT
flask-marshmallow
marshmallow-sqlalchemy

A Useful Guide

Debugging

• No module named 'flask_cors' when using gunicorn
• How can I run this flask app using gunicorn

Linking an old github repository with already exsistig heroku app | scenario when GitHub name is changed or code is deleted or duplicating code from a repo again

General

Seeing all configs

heroku config

Reseting DB

heroku pg:reset DATABASE_URL

Changing DB Schema (Deleting and creating a new DB)

• You can copy ur older db to new using ps:copy

Heroku Rollback to previous stable release

heroku releases
heroku releases:info v51
heroku rollback v51

Download | Clone code for any release | version from heroku

• Checkout only

heroku git:clone -a APPNAME
git checkout deployID
git reset --hard deployID 

Some Procfile Examples

web: gunicorn -w 4 -b 0.0.0.0:$PORT -k gevent main:app

web: python wsgi.py runserver 0.0.0.0:4000