User Registration Flow
A typical registration flow:
- User fills a registration form
- Backend validates fields (username/email uniqueness)
- Password is hashed
- User row is created
- Optionally log the user in
Model fields (example)
usernameusername(unique)emailemail(unique)password_hashpassword_hash
Example (simplified)
from flask import request, redirect, url_for, flash
from werkzeug.security import generate_password_hash
from flask_login import login_user
@app.route("/register", methods=["GET", "POST"])
def register():
if request.method == "POST":
username = request.form.get("username", "").strip()
email = request.form.get("email", "").strip().lower()
password = request.form.get("password", "")
if not username or not email or not password:
flash("All fields are required", "error")
return redirect(url_for("register"))
if User.query.filter_by(username=username).first():
flash("Username already taken", "error")
return redirect(url_for("register"))
if User.query.filter_by(email=email).first():
flash("Email already registered", "error")
return redirect(url_for("register"))
user = User(
username=username,
email=email,
password_hash=generate_password_hash(password),
)
db.session.add(user)
db.session.commit()
login_user(user)
flash("Welcome! Your account was created.", "success")
return redirect(url_for("dashboard"))
return "Register page"from flask import request, redirect, url_for, flash
from werkzeug.security import generate_password_hash
from flask_login import login_user
@app.route("/register", methods=["GET", "POST"])
def register():
if request.method == "POST":
username = request.form.get("username", "").strip()
email = request.form.get("email", "").strip().lower()
password = request.form.get("password", "")
if not username or not email or not password:
flash("All fields are required", "error")
return redirect(url_for("register"))
if User.query.filter_by(username=username).first():
flash("Username already taken", "error")
return redirect(url_for("register"))
if User.query.filter_by(email=email).first():
flash("Email already registered", "error")
return redirect(url_for("register"))
user = User(
username=username,
email=email,
password_hash=generate_password_hash(password),
)
db.session.add(user)
db.session.commit()
login_user(user)
flash("Welcome! Your account was created.", "success")
return redirect(url_for("dashboard"))
return "Register page"Next improvements
For production-quality registration:
- use Flask-WTF validators
- password policy (length/complexity)
- email verification
- rate limiting
- audit logging
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