Flask : sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) relation “users” does not exist

Question

I am working on a flask app based on http://code.tutsplus.com/tutorials/intro-to-flask-signing-in-and-out--net-29982.

As part of the tut I\'m trying to connect

Answer 1

You're initializing your database twice.

I'd suggest taking a good look at this: http://flask.pocoo.org/docs/0.10/patterns/sqlalchemy/

Essentially, you'll want to split things up into a few more files to prevent import issues and make things a little more clean. I've done the below which seems to work. Note, I've used SQLite, since I do not have Postgres installed on this box.

app.py

from flask import Flask
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////test11.db'

models.py

from flask.ext.sqlalchemy import SQLAlchemy
from app import app
db = SQLAlchemy(app)

class User(db.Model):
    __tablename__ = 'users'
    uid = db.Column(db.Integer, primary_key = True)
    firstname = db.Column(db.String(100))
    lastname = db.Column(db.String(100))
    email = db.Column(db.String(120), unique=True)
    pwdhash = db.Column(db.String(54))

def __init__(self, firstname, lastname, email, password):
    self.firstname = firstname.title()
    self.lastname = lastname.title()
    self.email = email.lower()
    self.set_password(password)

def set_password(self, password):
    self.pwdhash = (password)

def check_password(self, password):
    return password

routes.py

from models import User, db

db.create_all()
db.session.commit()

admin = User('admin', 'admin@example.com', 'admin1', 'admin1@example.com')
guest = User('admi2', 'admin@ex1ample.com', 'admin', 'admin2@example.com')
db.session.add(admin)
db.session.add(guest)
db.session.commit()

I'd definitely suggest looking over some tutorials! You'll need it: you should learn about web vulnerabilities, best practices, and so on.