I am following the CS50's Web Programming with Python and Javascript and in Lecture4 I have had the following error trying to create a postgresql database table:
Traceback (most recent call last):
File "create.py", line 19, in <module>
main()
File "create.py", line 15, in main
db.create_all()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py", line 963, in create_all
self._execute_for_all_tables(app, bind, 'create_all')
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py", line 955, in _execute_for_all_tables
op(bind=self.get_engine(app, bind), **extra)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py", line 896, in get_engine
return connector.get_engine()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py", line 556, in get_engine
self._sa.apply_driver_hacks(self._app, info, options)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py", line 830, in apply_driver_hacks
if info.drivername.startswith('mysql'):
AttributeError: 'NoneType' object has no attribute 'drivername'
The code that I have used is in two python file: The first 1 called models.py:
from flask_sqlalchemy import SQLAlchemy
db = SQLAlchemy()
class Flight(db.Model):
__tablename__ = "flights"
id = db.Column(db.Integer, primary_key=True)
origin = db.Column(db.String, nullable=False)
destination = db.Column(db.String, nullable=False)
duration = db.Column(db.Integer, nullable=False)
class Passenger(db.Model):
__tablename__ = "passengers"
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String, nullable=False)
flight_id = db.Column(db.Integer, db.ForeignKey("flight.id"), nullable=False)
The second file is called create.py:
import os
from flask import Flask, render_template, request
from models import *
app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = os.getenv("postgresql://postgres:password@localhost/database1")
app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
db.init_app(app)
def main():
db.create_all()
if __name__ == "__main__":
with app.app_context():
main()
Can you help me?!