I'm creating my first Flask project. The first part of the project is obviusly the login part. I made with html tho page for sign up and login. Then I wrote the flask part of the project. The code is the following, divided in the main.py file
from flask import Flask, render_template, redirect, url_for, session
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy import create_engine
from os import path
from flask_login import LoginManager
db = SQLAlchemy()
DB_NAME = "database.db"
def create_app():
app = Flask(__name__,static_url_path='/static')
app.secret_key = "referendumKey"
app.config['SQLALCHEMY_DATABASE_URI'] = f'sqlite:///{DB_NAME}'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS']=False
db.init_app(app)
#importation of all blueprints created
from .auth import auth
from .views import views
app.register_blueprint(auth, url_prefix='/')
app.register_blueprint(views, url_prefix='/')
#model import
from .models import Refs, User
create_database(app)
login_manager = LoginManager()
login_manager.login_view = 'auth.login'
login_manager.init_app(app)
#login_manager.user_loader
def load_user(id):
return User.query.get(int(id))
return app
#If you haven't already created a database, it will be created
def create_database(app):
if not path.exists('website/' + DB_NAME):
db.create_all(app=app)
print('Created Database!')
Then, the authentication file (auth.py)
from flask import Blueprint, render_template, session, redirect, url_for, request, flash
from .models import User
from . import db
from flask_login import login_user, login_required, logout_user, current_user
auth = Blueprint("auth", __name__)
#auth.route("/login", methods=["GET", "POST"])
def login():
if request.method == 'POST':
name =request.form.get("username")
psw =request.form.get("psw")
user = User.query.filter_by(name=name).first()
if user:
if psw == user.password:
flash("Logged succesfully", category="success")
login_user(user, remember=True)
return redirect(url_for("views.home"))
else:
flash("Incorrect password", category="error")
else:
flash("Unexistent user", category="error")
return render_template("login.html", user=current_user)
#auth.route("/signup", methods=["GET", "POST"])
def signup():
if request.method=="POST":
username=request.form.get('username')
psw1=request.form.get('psw1')
psw2=request.form.get('psw2')
user = User.query.filter_by(name=username).first()
if user:
flash("Username already exist", category="error")
elif len(username)<3:
flash("Username too short", category="error")
elif psw1!=psw2:
flash("Passwords are different", category="error")
else:
new_user = User(name=username, password=psw1)
db.session.add(new_user)
db.session.commit()
login_user(new_user, remember=True)
flash("Account created", category="Success")
return redirect(url_for(views.home))
return render_template("signup.html", user=current_user)
#auth.route('/logout')
#login_required
def logout():
logout_user()
return redirect(url_for('auth.login'))
And, the views.py file, that should let people see the home page with content
from flask import Blueprint, render_template, request, flash, jsonify
from flask_login import login_required, current_user
from . import db
views = Blueprint('views', __name__)
#views.route("/")
#views.route("/home")
#login_required
def home():
return render_template("home.html")
To store the datatypes, I used the models in the following code
from . import db
from flask_login import UserMixin
from sqlalchemy.sql import func
"""
Definire la classe che identidica un Referendum, inserendovi:
id di colonna, la domanda, la prima e la seconda risposta
possibili, i voti che hanno ricevuto, chi ha votato già, l'id
dell'utente che possiede il ref
"""
class Refs(db.Model):
id = db.Column(db.Integer,primary_key=True)
question = db.Column(db.String(200))
fAnsw = db.Column(db.String(200))
sAnsw = db.Column(db.String(200))
fVote = db.Column(db.Integer, default=0)
sVote = db.Column(db.Integer, default=0)
voters = db.Column(db.ARRAY(db.Integer))
user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
"""
Definire la classe utente inserendo il suo nome, la sua
password, e tutti i Referendum da lui creato
"""
class User(db.Model,UserMixin):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(150), unique=True)
password = db.Column(db.String(150))
refs = db.relationship('Refs')
Now, there is a problem. If I try to create a new account, or to login, there is an error. The error is the following one.
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such table: user
[SQL: SELECT user.id AS user_id, user.name AS user_name, user.password AS user_password
FROM user
WHERE user.name = ?
LIMIT ? OFFSET ?]
[parameters: ('sadas', 1, 0)]
(Background on this error at: http://sqlalche.me/e/14/e3q8)
And it shows the follow part of the code:
user = User.query.filter_by(name=name).first()
I guess the problem is in the model of the database, because it shows up a SQLAlchemy error. Probably I used an incorrect syntax. I read a lot of github repository, and also the official documentation (https://docs.sqlalchemy.org/en/14/),and even the link relased by the compiler, but I can't understand, I think I wrote it correctly. The error can even be in the flask_login API usage, but reading error and documentation I guess it isn't. Can someone help me please? Thanks
Creating a database at runtime is not preferred. Flask app needs to be connected to a database on start. You may create tables at runtime.
I suspect that you created an empty database somewhere. So the DB file may exist but contain no tables. You may in fact have two lingering SQLite files at different locations. Inspect your directories carefully.
Consider this code:
DB_NAME = "database.db"
def create_app():
app = Flask(__name__,static_url_path='/static')
app.secret_key = "referendumKey"
app.config['SQLALCHEMY_DATABASE_URI'] = f'sqlite:///{DB_NAME}'
This will create a SQLite file in the "current" directory (whatever it is).
Elsewhere you specify a relative path - again, it's not clear what the final path is but could very well be different than above:
def create_database(app):
if not path.exists('website/' + DB_NAME):
db.create_all(app=app)
print('Created Database!')
The fix is to use a fully qualified path for your DB, not a relative path.
Related
I am building a website using Flask and when I try to log in and signup I get this error AttributeError: 'list' object has no attribute 'is_active'
an error like this appears when I have used login_user in the flask_login library
here I use firestore database
I have tried various solutions on StackOverflow but none of them worked, I'm very confused now
this is my code
__ini__.py
from flask import Flask
from flask_login import UserMixin
from flask_login import LoginManager
import firebase_admin
from firebase_admin import credentials
from firebase_admin import firestore
def create_app():
app = Flask(__name__)
app.config['SECRET_KEY'] = 'adjadlkahd'
db = connect_database()
from .views import views
from .auth import auth
from .models import User
#check user login
login_manager = LoginManager()
login_manager.login_view = 'auth.login'
login_manager.init_app(app)
#create user model
#login_manager.user_loader
def load_user(id):
return User.get_user_id(id)
#register blueprints
app.register_blueprint(views, url_prefix='/')
app.register_blueprint(auth, url_prefix='/')
return app
cred = credentials.Certificate("websites\serviceAccountKey.json")
firebase_admin.initialize_app(cred)
def connect_database():
db = firestore.client()
return db
auth.py
from flask import Blueprint, render_template, request, redirect, url_for
from .models import User
from werkzeug.security import generate_password_hash, check_password_hash
from flask_login import login_user, login_required, logout_user, current_user
auth = Blueprint('auth', __name__)
#auth.route('/login', methods=['GET', 'POST'])
def login():
if request.method == 'POST':
email = request.form.get('email')
password = request.form.get('password')
user = User.log_in(email)
if user:
if check_password_hash(user[0].to_dict()['password'], password):
login_user(user, remember=True)
redirect(url_for('views.home'))
else:
return "<h1>paass salah</h1>"
else:
return "<h1>user tidak ada</h1>"
return render_template('login.html')
#auth.route('/logout')
#login_required
def logout():
logout_user()
return redirect(url_for('auth.login'))
#auth.route('/signup', methods=['GET', 'POST'])
def signup():
if request.method == 'POST':
username = request.form.get('username')
email = request.form.get('email')
password = request.form.get('password')
if User.check_user(email):
return "<h1>email already exist</h1>"
new_user = User(username=username, email=email,
password=generate_password_hash(password)).create_user()
login_user(new_user, remember=True)
return redirect(url_for('views.home'))
return render_template('signup.html')
models.py
from flask_login import UserMixin
from . import connect_database
import uuid
db = connect_database()
class User(UserMixin):
def __init__(self, username, email, password):
self.username = username
self.email = email
self.password = password
def create_user(self):
db.collection('user').document(self.username).set({
'id' : str(uuid.uuid4()),
'username': self.username,
'email': self.email,
'password': self.password
})
def log_in(email):
user = db.collection('user').where('email', '==', email).get()
return user
def check_user(email):
user = db.collection('user').where('email', '==', email).get()
return bool(user)
def get_user_id(id):
return db.collection('user').document(id).get()
views.py
from flask import Blueprint
from flask_login import login_required, current_user
views = Blueprint('views', __name__)
#views.route('/')
#login_required
def home():
return "<h1>logged in</h1>"
For flask login to work you need to have a user class that implements some properties and methods. When you use login_user method the argument should be an instance of that user class.
make user that your method def log_in(email) returns a user object not a list.
def log_in(email):
user = db.collection('user').where('email', '==', email).get()
return user # <-- most probably is a list.
Read the items form the user collection
Create an instance of the user class
fill the properties of the user class from the collection
return the instance
I am getting operational error no such table when I am entering data to my database. I have tried using db.create_all(), but it is not working. This is the image of the error.
I have tried db.create_all() in app and also using terminal but it is not working.
The database is created but table is not created in it.
models.py
from flask import app
from flask_sqlalchemy import SQLAlchemy
from application import app
from application import db
class Employee(db.Model):
id = db.Column(db.Integer(),primary_key=True)
username = db.Column(db.String(length=100),nullable=False)
email_address = db.Column(db.String(length=50),nullable=False)
password_hash = db.Column(db.String(length=60),nullable=False
init.py
from os import name
from flask import Flask, current_app, request
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)
with app.app_context():
print(current_app.name)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///database.db'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.config['SECRET_KEY'] = 'this is secret key'
db = SQLAlchemy(app)
routes.py
from application import routes
import re
from flask.helpers import url_for
from wtforms.form import Form
from application import app
from flask import Flask, render_template,redirect,url_for,flash,request
from application.forms import EmployeeRegistration, LoginForm
from application.models import Employee
from application import db
from werkzeug.security import generate_password_hash,check_password_hash
#app.route('/')
def index():
return render_template('index.html')
#app.route('/home')
def home():
return render_template('home.html')
#app.route('/register',methods=['GET','POST'])
def register():
form = EmployeeRegistration()
if form.validate_on_submit():
employee_to_create = Employee(
username=form.username.data,
email_address = form.email_address.data,
password_hash= generate_password_hash(form.password1.data)
)
db.session.add(employee_to_create)
db.session.commit()
return redirect(url_for('home'))
if form.errors != {}:# if there are not errors from the validations
for err_msg in form.errors.values():
flash(f"There was an error : {err_msg}",category='danger')
return render_template('register.html',form=form)
#app.route('/login',methods=['GET','POST'])
def login():
form = LoginForm()
return render_template('login.html',form=form)
I'm trying to create a registration page where the user's username and password would get sent to a database I have set up on Heroku. I do not get any errors and after clicking the submit button I get sent to the "you are registered" page, but the username and password don't get added to the db. Here is the code:
from flask import Flask, session, render_template, request
from flask_session import Session
from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker
from models import *
app = Flask(__name__)
# Check for environment variable
if not os.getenv("DATABASE_URL"):
raise RuntimeError("DATABASE_URL is not set")
# Configure session to use filesystem
app.config["SESSION_PERMANENT"] = False
app.config["SESSION_TYPE"] = "filesystem"
app.config['SQLALCHEMY_ECHO'] = True
Session(app)
# Set up database
engine = create_engine(os.getenv("DATABASE_URL"))
db = scoped_session(sessionmaker(bind=engine))
db1 = SQLAlchemy(app)
class User(db1.Model):
__tablename__ = "users"
user_id = db1.Column(db1.Integer, primary_key=True,)
username = db1.Column(db1.String, nullable=False)
password = db1.Column(db1.String, nullable=False)
def add_user(self, u):
self.users.append(u)
u.user_id = self.id
with app.app_context():
db1.init_app(app)
db1.create_all()
#app.route("/", methods=['POST', 'GET'])
def main():
return render_template('main.html')
#app.route("/registered", methods=['POST'])
def registered():
username = request.form.get('rusername')
password = request.form.get('rpassword')
u1 = User(username=username, password=password)
db1.session.add(u1)
db1.session.commit()
return '<h1> You are registered! <h1>'
#app.route("/loggedin", methods=['POST'])
def loggedin():
return '<h1> You are logged in! <h1>'
Thank you for your help!
I have 3 blueprints in a flask app and the dir structure is like:
main/
__init__.py
books/
users/
authors/
apps/
Every package inisde main is a blueprint.
In my main/__init__.py i have
from flask import Flask
from flask_pymongo import PyMongo
app = Flask(__name__)
from main.users.views import users
from main.admin.views import admin
app.register_blueprint(users, url_prefix='/api/users')
MONGO_HOST = os.environ['MONGO_HOST']
MONGO_PORT = os.environ['MONGO_PORT']
app.config["MONGO_URI"] = "mongodb://{}:{}/".format(MONGO_HOST, MONGO_PORT)
mongo = PyMongo(app)
How do I access mongo inside each blueprint ? Is this even correct way of using mongo here.
in official documentation it says not to use something like db=Pymongo(app)
I guess the answer comes too late for you, but eventually it will help anyways.
I usually exclude the database-lines in an external file, e.g. database.py.
and then import the mongo instance in my app and in the blueprints, respectively. Please consider the example below. For the sake of completion and comprehension I also added other elements that make sense for the functions.
database.py
from flask_pymongo import PyMongo
mongo = PyMongo()
forms.py
from wtforms import Form
from wtforms.fields import BooleanField, PasswordField, StringField
from wtforms.validators import Email, Required
class LoginForm(Form):
email = StringField('Email', validators=[Required(), Email('Not a valid email address')])
password = PasswordField('Password',validators=[Required()])
remember = BooleanField('Remember')
authentication.py
from flask import Blueprint, redirect, render_template, request
from flask_login import LoginManager, UserMixin, current_user, login_user
from werkzeug.security import check_password_hash
from database import mongo
from forms import LoginForm
authentication = Blueprint('authentication', __name__, template_folder='templates')
login_manager = LoginManager()
login_manager.login_view = 'authentication.log_in'
#authentication.route('/login', methods=['GET', 'POST'])
def log_in():
if (current_user.is_authenticated):
return redirect(url_for('get_index'))
login_form = LoginForm(request.form)
if (request.method == 'POST'):
if (login_form.validate()):
user_collection = mongo.db.user
user = user_collection.find_one({'email':login_form.email.data})
if (user) and (check_password_hash(user['password'],
login_form.password.data)):
login_user(User(user), login_form.remember)
return redirect(url_for('get_index'))
else:
return render_template('login.html', form=login_form)
elif (request.method == 'GET'):
return render_template('login.html', form=login_form)
class User(UserMixin):
def __init__(self, user):
super()
self.id = user['_id']
self.email = user['email']
def get(user_id, mongo):
user_collection = mongo.db.user
user = user_collection.find_one({'_id':ObjectId(user_id)})
return User(user)
#login_manager.user_loader
def load_user(user_id):
return User.get(user_id, mongo)
app.py
from flask import Flask, render_template, request
from flask_login import login_required
from authentication import authentication, login_manager
from database import mongo
from forms import LoginForm
app = Flask(__name__)
app.secret_key = os.urandom(24)
app.config['MONGO_URI'] = 'mongodb:27017/app'
mongo.init_app(app)
app.register_blueprint(authentication)
login_manager.init_app(app)
#app.route('/', methods=['GET'])
#login_required
def get_index():
if (request.method == 'GET'):
render_template('index.html')
if __name__ == '__main__':
app.run(host="0.0.0.0")
I am Creating a Flask Application.Application is running perfectly on local server. There is no error but the data is not stored in the database. What am i Missing?
1.routes.py
from flask import Flask,render_template,request
from models import db ,User
from forms import SignupForm
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = "sqlite:////Database.db"
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = True
db. init_app(app)
app.secret_key ='development_key'
#app.route('/' , methods=['GET','POST'])
def index():
form = SignupForm() #form object
if request.method == 'POST':
if form.validate() == False:
return render_template('index.htm' , form=form)
else:
#new user to be added to database newuser = User(form.fname.data,form.lname.data,form.email.data,form.password.data)
db.create_all()
db.session.add(newuser)
db.session.commit()
return render_template('profile.htm')
elif request.method == 'GET':
return render_template('index.htm',form=form)
#app.route('/aboutus')
def aboutus():
return render_template('aboutus.htm')
#app.route('/profile')
def profile():
return render_template('profile.htm')
#app.route('/contactus')
def contactus():
return render_template('contactus.htm')
2.app.py
from routes import app
app.run(debug = True)
3.forms.py
from flask_wtf import FlaskForm as Form
from wtforms import StringField,PasswordField,SubmitField
from wtforms.validators import DataRequired,Email,Length
class SignupForm(Form):
fname = StringField('First Name',validators=[DataRequired("Please Enter Your FirstName")])
lname = StringField('Last Name',validators=[DataRequired("Please Enter Your LastName")])
password = PasswordField('Password',validators=[DataRequired("Password Can't Be Empty"), Length(min=8,message="Password Must Be 8 character Long")])
email = StringField('Email',validators=[DataRequired("Please Enter Your Email") , Email("Please Enter A Valid Email")])
submit = SubmitField('Register')
4.models.py
from flask_sqlalchemy import SQLAlchemy
from werkzeug import generate_password_hash, check_password_hash
db = SQLAlchemy()
class User(db.Model):
__tablename__= "users"
id=db.Column(db.Integer,primary_key=True)
fname = db.Column(db.String(100))
lname = db.Column(db.String(100))
email = db.Column(db.String(100),unique=True)
password = db.Column(db.String(100))
def __init__(self,fname,lname,email,password):
self.fname=fname
self.lname=lname
self.email=email
self.set_password(password)
def set_password(self,password):
self.password=generate_password_hash(password)
def check_password(self,password):
return check_password_hash(self.password,password)
I tried your code. The database wasn't being created. Try something like this instead to ensure your database file is in the proper place:
import os
basedir = os.path.abspath(os.path.dirname(__file__))
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + os.path.join(basedir, 'Database.db')
Do not use sqlite3 for production purpose and rather use postgresql because sqlite3 is good for local machine stuff and does not work well on the online servers as it is also does not works well on the heroku hosting platform where the database gets reset at least once in every 24 hours for which you can even check the following link https://devcenter.heroku.com/articles/sqlite3 though you did not mentioned using heroku but I am still suggesting this because heroku is very common hosting place.