I am building a webapp using Flask. I imported the flask-login library to handle user login. But it shows an ImportError.
Below is my folder structure:
>flask_blog1
>flaskblog
>static
>templates
>__init__.py
>forms.py
>models.py
>routes.py
>instance
>site.db
>venv
>requirements.txt
>run.py
My run.py:
from flaskblog import app
if __name__ == "__main__":
app.run(debug=True)
My __init__.py:
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_bcrypt import Bcrypt
from flask_login import LoginManager
app = Flask(__name__)
app.config["SECRET_KEY"] = "5791628bb0b13ce0c676dfde280ba245"
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///site.db"
db = SQLAlchemy(app)
bcrypt = Bcrypt(app)
login_manager = LoginManager(app)
from flaskblog import routes
My models.py:
from datetime import datetime
# from .extensions import db
from flaskblog import db, login_manager
from flask_login import UserMixin
@login_manager.user_loader
def load_user(user_id):
return User.query.get(int(user_id))
class User(db.Model, UserMixin):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(20), unique=True, nullable=False)
email = db.Column(db.String(120), unique=True, nullable=False)
image_file = db.Column(db.String(20), nullable=False, default="default.jpg")
password = db.Column(db.String(60), nullable=False)
posts = db.relationship("Post", backref="author", lazy=True)
def __repr__(self):
return f"User('{self.username}', '{self.email}', '{self.image_file}')"
class Post(db.Model):
id = db.Column(db.Integer, primary_key=True)
title = db.Column(db.String(100), nullable=False)
date_posted = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)
content = db.Column(db.Text, nullable=False)
user_id = db.Column(db.Integer, db.ForeignKey("user.id"), nullable=False)
def __repr__(self):
return f"Post('{self.title}', '{self.date_posted}')"
My routes.py:
from flask import render_template, flash, redirect, url_for
from flaskblog import app, db, bcrypt
from flaskblog.forms import RegistrationForm, LoginForm
from flaskblog.models import User, Post
from flask_login import login_user
posts = [
{
"author": "Ashutosh Chapagain",
"title": "Blog Post 1",
"content": "First Post Content",
"date_posted": "October 1, 2023",
},
{
"author": "Ash Dhakal",
"title": "Blog Post 2",
"content": "Second Post Content",
"date_posted": "October 2, 2023",
},
]
@app.route("/")
@app.route("/home")
def home():
return render_template("home.html", posts=posts)
@app.route("/about")
def about():
return render_template("about.html", title="About")
@app.route("/register", methods=["GET", "POST"])
def register():
form = RegistrationForm()
if form.validate_on_submit():
hashed_password = bcrypt.generate_password_hash(form.password.data).decode(
"utf-8"
)
user = User(
username=form.username.data, email=form.email.data, password=hashed_password
)
db.session.add(user)
db.session.commit()
flash(f"Your account has been created! You are now able to log in!", "success")
return redirect(url_for("login"))
return render_template("register.html", title="Register", form=form)
@app.route("/login", methods=["GET", "POST"])
def login():
form = LoginForm()
if form.validate_on_submit():
user = User.query.filter_by(email=form.email.data).first()
if user and bcrypt.check_password_hash(user.password, form.password.data):
login_user(user, remember=form.remember.data)
return redirect(url_for("home"))
else:
flash("Login Unsuccessful. Please check email and password", "danger")
return render_template("login.html", title="Login", form=form)
My forms.py:
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, SubmitField, BooleanField
from wtforms.validators import DataRequired, Length, Email, EqualTo, ValidationError
from flaskblog.models import User
class RegistrationForm(FlaskForm):
username = StringField(
"Username", validators=[DataRequired(), Length(min=2, max=20)]
)
email = StringField("Email", validators=[DataRequired(), Email()])
password = PasswordField("Password", validators=[DataRequired()])
confirm_password = PasswordField(
"Confirm Password", validators=[DataRequired(), EqualTo("password")]
)
submit = SubmitField("Sign Up")
def validate_username(self, username):
user = User.query.filter_by(username=username.data).first()
if user:
raise ValidationError(
"That username is taken. Please choose a different one."
)
def validate_email(self, email):
user = User.query.filter_by(email=email.data).first()
if user:
raise ValidationError("That email is taken. Please choose a different one.")
class LoginForm(FlaskForm):
email = StringField("Email", validators=[DataRequired(), Email()])
password = PasswordField("Password", validators=[DataRequired()])
remember = BooleanField("Remember Me")
submit = SubmitField("Login")
The exact error is:
(venv) asu@asu-Lenovo-Legion-5-15ARH05:/media/asu/Data/Projects/flask_blog1$ python3 run.py
Traceback (most recent call last):
File "/media/asu/Data/Projects/flask_blog1/run.py", line 1, in <module>
from flaskblog import app
File "/media/asu/Data/Projects/flask_blog1/flaskblog/__init__.py", line 4, in <module>
from flask_login import LoginManager
File "/media/asu/Data/Projects/flask_blog1/venv/lib/python3.10/site-packages/flask_login/__init__.py", line 12, in <module>
from .login_manager import LoginManager
File "/media/asu/Data/Projects/flask_blog1/venv/lib/python3.10/site-packages/flask_login/login_manager.py", line 33, in <module>
from .utils import _create_identifier
File "/media/asu/Data/Projects/flask_blog1/venv/lib/python3.10/site-packages/flask_login/utils.py", line 14, in <module>
from werkzeug.urls import url_decode
ImportError: cannot import name 'url_decode' from 'werkzeug.urls' (/media/asu/Data/Projects/flask_blog1/venv/lib/python3.10/site-packages/werkzeug/urls.py)