📌 Introduction

Django provides a built-in User model for authentication.
Using this model, we can create features like:

user registration
login
logout
password management

In this program, we will create a registration page where a new user can sign up using:

username
email
password
confirm password

This is a very important topic for real-world applications.

🎯 Program Statement

👉 Create a user registration page using Django built-in User model.

🧠 Concept

This program uses:

Django built-in User model
Django forms.py
create_user() method
POST form submission

⚙️ Step 1: Import User Model and Create Registration Form

📁 File: `forms.py`

🔹 Path:

myproject/myapp/forms.py

🔹 Code:

from django import forms

class RegisterForm(forms.Form):
    username = forms.CharField(label='Enter Username', max_length=100)
    email = forms.EmailField(label='Enter Email')
    password = forms.CharField(label='Enter Password', widget=forms.PasswordInput)
    confirm_password = forms.CharField(label='Confirm Password', widget=forms.PasswordInput)

    def clean(self):
        cleaned_data = super().clean()
        password = cleaned_data.get('password')
        confirm_password = cleaned_data.get('confirm_password')

        if password and confirm_password and password != confirm_password:
            raise forms.ValidationError("Passwords do not match.")

        return cleaned_data

🧠 Explanation

username → for login identity
email → user email
password and confirm_password → password confirmation
PasswordInput hides typed password
clean() checks whether both passwords match

⚙️ Step 2: Create Registration View

📁 File: `views.py`

🔹 Path:

myproject/myapp/views.py

🔹 Code:

from django.shortcuts import render, redirect
from django.contrib.auth.models import User
from .forms import RegisterForm

def register_user(request):
    success = False
    error_message = None

    if request.method == 'POST':
        form = RegisterForm(request.POST)
        if form.is_valid():
            username = form.cleaned_data['username']
            email = form.cleaned_data['email']
            password = form.cleaned_data['password']

            if User.objects.filter(username=username).exists():
                error_message = "Username already exists."
            else:
                User.objects.create_user(
                    username=username,
                    email=email,
                    password=password
                )
                success = True
                form = RegisterForm()
    else:
        form = RegisterForm()

    return render(request, 'register_user.html', {
        'form': form,
        'success': success,
        'error_message': error_message
    })

🧠 Explanation

User.objects.create_user() creates a new user safely
Password is stored in encrypted form
Username uniqueness is checked before creating account
On success, the form is cleared

⚙️ Step 3: URL Mapping

📁 File: `urls.py`

🔹 Path:

myproject/myproject/urls.py

🔹 Code:

from django.contrib import admin
from django.urls import path
from myapp import views

urlpatterns = [
    path('admin/', admin.site.urls),
    path('register/', views.register_user, name='register_user'),
]

⚙️ Step 4: Create Template

📁 File: `register_user.html`

🔹 Path:

myproject/templates/register_user.html

🔹 Code:

<!DOCTYPE html>
<html>
<head>
    <title>User Registration</title>
</head>
<body>

    <h1>User Registration Page</h1>

    <form method="post">
        {% csrf_token %}
        {{ form.as_p }}
        <button type="submit">Register</button>
    </form>

    <hr>

    {% if success %}
        <h2 style="color: green;">User registered successfully!</h2>
    {% endif %}

    {% if error_message %}
        <h2 style="color: red;">{{ error_message }}</h2>
    {% endif %}

</body>
</html>

🧠 Explanation

{{ form.as_p }} renders all fields
success and error messages are displayed conditionally
CSRF token is required because form uses POST

⚙️ Step 5: Make Sure Auth App is Enabled

📁 File: `settings.py`

🔹 Path:

myproject/myproject/settings.py

🔹 Confirm these apps exist:

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'myapp',
]

🧠 Explanation

Django’s built-in User model belongs to:

'django.contrib.auth'

So this app must be enabled.

⚙️ Step 6: Apply Migrations for Auth Tables

If not already done, run:

python manage.py migrate

🧠 Explanation

This creates the authentication-related tables, including the built-in auth_user table.

⚙️ Step 7: Run Server

python manage.py runserver

🌐 Step 8: Output

Open:

👉 http://127.0.0.1:8000/register/

✅ Example Input:

Username: kavita
Email: kavita@example.com
Password: 12345678
Confirm Password: 12345678

✅ Output:

User registered successfully!

❌ If username already exists:

Username already exists.

❌ If passwords do not match:

Passwords do not match.

🧠 How It Works

User opens registration page
Enters username, email, password, confirm password
Form is submitted using POST
Django validates the form
clean() checks password match
View checks username uniqueness
create_user() saves the user
Success message is shown

🔥 Key Concepts

Built-in User Model

from django.contrib.auth.models import User

Used for authentication-related user data.

Create User

User.objects.create_user(...)

Creates user with hashed password.

Password Match Validation

def clean(self):

Used for custom cross-field validation.

Password Input Widget

widget=forms.PasswordInput

Hides typed password characters.

⚠️ Common Errors

❌ Using `create()` instead of `create_user()`

Do not use:

User.objects.create(...)

because password will not be hashed properly.

Use:

User.objects.create_user(...)

❌ Forgot `django.contrib.auth` in `INSTALLED_APPS`

Then Django authentication system will not work properly.

❌ Password mismatch not checked

Always validate password and confirm_password.

❌ Duplicate username

Username must be unique for each user.

❌ Forgot to run migrations

The built-in user table must exist in database.

🧪 Practice Questions

Add first name and last name fields
Add custom success redirect after registration
Show login link after successful registration
Validate minimum password length
Check duplicate email also

🎤 Viva Questions & Answers

1. What is the built-in User model in Django?

The built-in User model is provided by Django for authentication and user management. It stores data like username, email, password, and permissions.

2. Why do we use `create_user()` instead of `create()`?

create_user() stores the password in hashed form, which is secure. create() would store it as plain text unless handled manually.

3. What is the purpose of `PasswordInput` widget?

It hides the entered password characters in the browser for security.

4. Why do we use `clean()` method in the registration form?

clean() is used to perform custom validation involving multiple fields, such as checking whether password and confirm password match.

5. Why is username uniqueness important?

Each user must have a unique username so that Django can identify users correctly during login.

6. What is the use of `django.contrib.auth`?

It provides Django’s built-in authentication system, including the User model, login, logout, and permission handling.

7. Why do we run migrations before registration?

Migrations create the necessary authentication tables in the database, including the user table.

8. What happens if passwords do not match?

The form becomes invalid, and a validation error message is shown to the user.

9. Can we also store email in the built-in User model?

Yes, the built-in User model includes an email field.

10. Why is this program important?

It is the foundation of user authentication systems and is used in most real Django applications.

🔗 Navigation

👉 Next Post: Implement Login, Logout, and Protected Page using Authentication
👉 Back to List: Django Programs (60 Questions with Solutions)

📌 Introduction

🎯 Program Statement

🧠 Concept

⚙️ Step 1: Import User Model and Create Registration Form

📁 File: forms.py

🔹 Path:

🔹 Code:

🧠 Explanation

⚙️ Step 2: Create Registration View

📁 File: views.py

🔹 Path:

🔹 Code:

🧠 Explanation

⚙️ Step 3: URL Mapping

📁 File: urls.py

🔹 Path:

🔹 Code:

⚙️ Step 4: Create Template

📁 File: register_user.html

🔹 Path:

🔹 Code:

🧠 Explanation

⚙️ Step 5: Make Sure Auth App is Enabled

📁 File: settings.py

🔹 Path:

🔹 Confirm these apps exist:

🧠 Explanation

⚙️ Step 6: Apply Migrations for Auth Tables

🧠 Explanation

⚙️ Step 7: Run Server

🌐 Step 8: Output

✅ Example Input:

✅ Output:

❌ If username already exists:

❌ If passwords do not match:

🧠 How It Works

🔥 Key Concepts

Built-in User Model

Create User

Password Match Validation

Password Input Widget

⚠️ Common Errors

❌ Using create() instead of create_user()

❌ Forgot django.contrib.auth in INSTALLED_APPS

❌ Password mismatch not checked

❌ Duplicate username

❌ Forgot to run migrations

🧪 Practice Questions

🎤 Viva Questions & Answers

1. What is the built-in User model in Django?

2. Why do we use create_user() instead of create()?

3. What is the purpose of PasswordInput widget?

4. Why do we use clean() method in the registration form?

5. Why is username uniqueness important?

6. What is the use of django.contrib.auth?

7. Why do we run migrations before registration?

8. What happens if passwords do not match?

9. Can we also store email in the built-in User model?

10. Why is this program important?

🔗 Navigation

Further Reading

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Leave a Reply Cancel reply

📁 File: `forms.py`

📁 File: `views.py`

📁 File: `urls.py`

📁 File: `register_user.html`

📁 File: `settings.py`

❌ Using `create()` instead of `create_user()`

❌ Forgot `django.contrib.auth` in `INSTALLED_APPS`

2. Why do we use `create_user()` instead of `create()`?

3. What is the purpose of `PasswordInput` widget?

4. Why do we use `clean()` method in the registration form?

6. What is the use of `django.contrib.auth`?