How can I host my backend flask app on heroku? - postgresql

Question

I have a reach app acting as the frontend and a flask app acting as the backend.
I hosted the frontend on heroku. The problem is with the backend.
When ever I deploy it on heroku it builds fine but I always get The below.
when I check the logs, I see the below.
I'm not sure what the issue is but I am thinking its in models file.
database_path = os.environ['DATABASE_URL']
db = SQLAlchemy()
def setup_db(app, database_path=database_path):
if database_path.startswith("postgres://"):
database_path = database_path.replace("postgres://", "postgresql://", 1)
app.config["SQLALCHEMY_DATABASE_URI"] = database_path
engine = sqlalchemy.create_engine(database_path)
if not database_exists(engine.url):
create_database(engine.url)
app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
db.app = app
db.init_app(app)
db.create_all()
Any ideas?
if I didnt include enough information I apologize, I am brand new to running my web pages outside of my local machine.
EDIT:
I created procfile and added
web: gunicorn flaskr:app
new log is
my app structure is

Answer 1

First Try this in while deploying
heroku addons:create heroku-postgresql:hobby-dev
If that doesn't fix it, try the below
It looks from the logs that you have not configured the dynamo properly in your Procfile. Use gunicorn and try adding this to your Profile web: gunicorn app:app. This should fix the problem. If not, as you are using postgresql, it would be helpful if you download the heroku addon for postgresql from here
This should fix your problem. If Not, below listed are all the steps for deploying a heroku app. Please check if you followed all the below steps properly and in order.
For Flask I recommend doing the following things
Download heroku cli
Start a virtual environment with python -m venv . in your project fil
Activate the virtual environment
Login to your heroku account in the cli with heroku login
Install gunicorn pip install gunicorn
In your virtual environment, install the modules again with pip
Create a requirements.txt with pip freeze > requirements.txt
Create "Procfile" with the following info web: gunicorn app:app, this will fix the dynamo problem in the log
Start a empty git repository with git init
Create a appropiate .gitignore, you can find the template here
Create a new heroku app with heroku create my-app-flask
Add files to heroku git, git add .
As You are using postgresql, it would be helpful if you download the heroku addon for your app Get it here
Finally, git commit -m "Message" and git push heroku master
This should fix your problem.