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Python & Postgres Heroku Deployment

Python Heroku Deployment

Steps to create a postgres database and deply a Python app to Heroku

Install guinicorn locally

pipenv install gunicorn
or
pip install gunicorn

Install Heroku CLI

https://devcenter.heroku.com/articles/heroku-cli

Login via CLI

heroku login

Create app

heroku create appname

Create database

heroku addons:create heroku-postgresql:hobby-dev --app appname

Get URI

heroku config --app appname

# Add to your app

Create Procfile

touch Procfile

# Add this
web: gunicorn app:app

Create requirements.txt

pip freeze > requirements.txt

Create runtime.txt

touch runtime.txt

# Add this
python-3.7.2

Deploy with Git

git init
git add . && git commit -m 'Deploy'
heroku git:remote -a appname
git push heroku master

Add table to remote database

heroku run python
>>> from app import db
>>> db.create_all()
>>>exit()

Visit app

heroku open
@aprakarsa
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aprakarsa commented Mar 30, 2021

When I tried to create postgresql table on heroku python cli this error happened and won't let me create the table.. any help appreciated..

db.create_all()

Traceback (most recent call last):
File "", line 1, in
File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/init.py", line 1094, in create_all
self._execute_for_all_tables(app, bind, 'create_all')
File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/init.py", line 1086, in _execute_for_all_tables
op(bind=self.get_engine(app, bind), **extra)
File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/init.py", line 1017, in get_engine
return connector.get_engine()
File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/init.py", line 594, in get_engine
self._engine = rv = self._sa.create_engine(sa_url, options)
File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/init.py", line 1027, in create_engine
return sqlalchemy.create_engine(sa_url, **engine_opts)
File "", line 2, in create_engine
File "/app/.heroku/python/lib/python3.9/site-packages/sqlalchemy/util/deprecations.py", line 298, in warned
return fn(*args, **kwargs)
File "/app/.heroku/python/lib/python3.9/site-packages/sqlalchemy/engine/create.py", line 522, in create_engine
entrypoint = u._get_entrypoint()
File "/app/.heroku/python/lib/python3.9/site-packages/sqlalchemy/engine/url.py", line 653, in _get_entrypoint
cls = registry.load(name)
File "/app/.heroku/python/lib/python3.9/site-packages/sqlalchemy/util/langhelpers.py", line 341, in load
raise exc.NoSuchModuleError(
sqlalchemy.exc.NoSuchModuleError: Can't load plugin: sqlalchemy.dialects:postgres

@bek91
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bek91 commented Apr 8, 2021

When I tried to create postgresql table on heroku python cli this error happened and won't let me create the table.. any help appreciated..

db.create_all()

Traceback (most recent call last):
File "", line 1, in
File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/init.py", line 1094, in create_all
self._execute_for_all_tables(app, bind, 'create_all')
File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/init.py", line 1086, in _execute_for_all_tables
op(bind=self.get_engine(app, bind), **extra)
File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/init.py", line 1017, in get_engine
return connector.get_engine()
File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/init.py", line 594, in get_engine
self._engine = rv = self._sa.create_engine(sa_url, options)
File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/init.py", line 1027, in create_engine
return sqlalchemy.create_engine(sa_url, **engine_opts)
File "", line 2, in create_engine
File "/app/.heroku/python/lib/python3.9/site-packages/sqlalchemy/util/deprecations.py", line 298, in warned
return fn(*args, **kwargs)
File "/app/.heroku/python/lib/python3.9/site-packages/sqlalchemy/engine/create.py", line 522, in create_engine
entrypoint = u._get_entrypoint()
File "/app/.heroku/python/lib/python3.9/site-packages/sqlalchemy/engine/url.py", line 653, in _get_entrypoint
cls = registry.load(name)
File "/app/.heroku/python/lib/python3.9/site-packages/sqlalchemy/util/langhelpers.py", line 341, in load
raise exc.NoSuchModuleError(
sqlalchemy.exc.NoSuchModuleError: Can't load plugin: sqlalchemy.dialects:postgres

SQLAlchemy has stopped supporting 'postgres', and now has to be 'postgresql'.

To work around it, change postgres to postgresql In your app.config['SQLALCHEMY_DATABASE_URI'] = ''

@guimatheus92
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guimatheus92 commented Apr 17, 2021

I have a SQLITE db file already with data, and I'd like to deploy to Heroku. How can I do?
When I tried to create postgresql table on heroku python cli this error happened and won't let me create the table:

RuntimeError: No application found. Either work inside a view function or push an application context. See http://flask-sqlalchemy.pocoo.org/contexts/.

My app repository is in: https://github.com/guimatheus92/Game-Recommendation-System

My app file is in init.py:

# init.py

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager 
# For relative imports to work in Python 3.6
import os, sys; sys.path.append(os.path.dirname(os.path.realpath(__file__)))
import re

# init SQLAlchemy so we can use it later in our models
db = SQLAlchemy()

def create_app():
    app = Flask(__name__)

    app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False    
    app.config['SECRET_KEY'] = environ.get('SECRET_KEY')
    app.config['SQLALCHEMY_DATABASE_URI'] = environ.get('DATABASE_URL') or 'sqlite:///Games.db'
        
    db.init_app(app)

    login_manager = LoginManager()
    login_manager.login_view = 'auth.login'
    login_manager.init_app(app)

    from models import User

    @login_manager.user_loader    
    def load_user(user_id):
        # since the user_id is just the primary key of our user table, use it in the query for the user
        return User.query.get(int(user_id))

    # blueprint for auth routes in our app
    from auth import auth as auth_blueprint
    app.register_blueprint(auth_blueprint)

    # blueprint for non-auth parts of app
    from main import main as main_blueprint
    app.register_blueprint(main_blueprint)

    # blueprint for non-auth parts of app
    from games import games as main_blueprint
    app.register_blueprint(main_blueprint)

    # blueprint for non-auth parts of app
    from ml_utils import ml_utils as main_blueprint
    app.register_blueprint(main_blueprint)

    return app

@JigsAwe
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JigsAwe commented Apr 17, 2021

image
im at this part already, im having this problem, i appreciate any sort of help I can get.

@Rishavsinha19981
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Rishavsinha19981 commented May 12, 2021

image

I AM ABLE TO SEE THIS ERROR AFTER DEPLOYING IN HEROKU AND CREATING DATABASE ALSO BY CREATE_ALL() but then also this is showing up can ANY1 HELP ME PLZZZ

@esha123802
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esha123802 commented Jul 17, 2021

image
im at this part already, im having this problem, i appreciate any sort of help I can get.

Im having the same error, did you figure it out? I have added the bin path to env also

@srinumadhavv
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srinumadhavv commented Aug 12, 2021

Everything is running fine but unable to access the database , it says table not found

@lena-A-Al
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lena-A-Al commented May 12, 2022

heroku open
is not working?

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