User model overview in Django - Mini Project: Build & Apply

User Model Overview in Django

📖 Scenario: You are building a simple Django app that manages users. You want to understand how to create and configure a basic user model to store user information.

🎯 Goal: Build a basic Django user model with fields for username, email, and date joined.

📋 What You'll Learn

Create a Django model named User

Add fields username, email, and date_joined with correct field types

Set username as a unique field

Use Django's models.Model as the base class

💡 Why This Matters

🌍 Real World

User models are essential in web apps to store and manage user data like login info and profiles.

💼 Career

Understanding Django models is key for backend web development roles working with Python and Django frameworks.

1

Create the User model class

Create a Django model class called User that inherits from models.Model.

Django

from django.db import models

# Create the User model class here
# Your code here

Hint

Use class User(models.Model): to start your model.

2

Add username and email fields

Inside the User model, add a username field as models.CharField with max_length=150 and unique=True. Also add an email field as models.EmailField.

Django

from django.db import models

class User(models.Model):
    # Add username and email fields here
    # Your code here

Hint

Use models.CharField for username with max_length=150 and unique=True. Use models.EmailField for email.

3

Add date_joined field

Add a date_joined field to the User model using models.DateTimeField with auto_now_add=True to store when the user joined.

Django

from django.db import models

class User(models.Model):
    username = models.CharField(max_length=150, unique=True)
    email = models.EmailField()
    # Add date_joined field here
    # Your code here

Hint

Use models.DateTimeField(auto_now_add=True) to automatically set the join date.

4

Add string representation method

Add a __str__ method to the User model that returns the username as a string.

Django

from django.db import models

class User(models.Model):
    username = models.CharField(max_length=150, unique=True)
    email = models.EmailField()
    date_joined = models.DateTimeField(auto_now_add=True)

    # Add __str__ method here
    # Your code here

Hint

Define def __str__(self): and return self.username.

Practice

1. What is the primary purpose of Django's built-in User model?

easy

A. To manage static files like CSS and JavaScript

B. To handle database migrations automatically

C. To create HTML templates for user profiles

D. To store and manage user accounts including authentication

Solution

1. Step 1: Understand the role of the User model

   The User model in Django is designed to handle user accounts, including login and authentication.

2. Step 2: Compare options with User model functions

   Options B, C, and D relate to other Django features, not user management.

3. Final Answer:

   To store and manage user accounts including authentication -> Option D

4. Quick Check:

   User model = user account management [OK]

Hint: User model = user accounts and login management [OK]

Common Mistakes:

• Confusing User model with template or static file handling
• Thinking User model manages database migrations
• Assuming User model creates HTML pages

2. Which of the following is the correct way to import Django's default User model?

easy

A. from django.contrib.auth.models import User

B. import django.auth.User

C. from django.models import User

D. from django.contrib.auth import UserModel

Solution

1. Step 1: Recall the correct import path for User

   Django's default User model is located in django.contrib.auth.models.

2. Step 2: Check each option's syntax

   from django.contrib.auth.models import User matches the correct import syntax. Options A, C, and D are incorrect or invalid imports.

3. Final Answer:

   from django.contrib.auth.models import User -> Option A

4. Quick Check:

   Correct import path = from django.contrib.auth.models import User [OK]

Hint: User model is in django.contrib.auth.models [OK]

Common Mistakes:

• Using incorrect module paths
• Trying to import User directly from django.models
• Confusing User with UserModel

3. What will be the output of this code snippet?

from django.contrib.auth.models import User
user = User.objects.create_user(username='alice', password='pass123')
print(user.is_active)

medium

A. False

B. None

C. True

D. Raises an error

Solution

1. Step 1: Understand create_user default behavior

   The create_user method creates a user with is_active set to True by default.

2. Step 2: Check the printed attribute

   Printing user.is_active will output True unless explicitly changed.

3. Final Answer:

   True -> Option C

4. Quick Check:

   Default is_active = True [OK]

Hint: create_user sets is_active True by default [OK]

Common Mistakes:

• Assuming is_active is False by default
• Expecting None or error without context
• Confusing create_user with create_superuser

4. Identify the error in this code snippet that tries to create a user:

from django.contrib.auth.models import User
user = User.objects.create(username='bob', password='secret')

medium

A. Username must be an email address

B. Using create() instead of create_user() for password hashing

C. Password field cannot be set during user creation

D. Missing import for User model

Solution

1. Step 1: Check method used for user creation

   The create() method does not hash passwords; create_user() should be used instead.

2. Step 2: Analyze the impact of using create()

   Using create() stores the password as plain text, which is insecure and incorrect.

3. Final Answer:

   Using create() instead of create_user() for password hashing -> Option B

4. Quick Check:

   Use create_user() to hash passwords [OK]

Hint: Use create_user() to hash passwords, not create() [OK]

Common Mistakes:

• Using create() which stores raw passwords
• Forgetting to import User
• Thinking username must be email

5. You want to extend Django's default User model to add a 'birth_date' field. Which approach is recommended?

hard

A. Create a separate model with OneToOneField to User and add birth_date there

B. Directly add birth_date field to the built-in User model

C. Override User model by copying all fields and adding birth_date

D. Add birth_date as a global variable in settings.py

Solution

1. Step 1: Understand Django's recommended user extension

   Django suggests extending User by creating a profile model linked with OneToOneField.

2. Step 2: Evaluate options for adding fields

   Directly modifying built-in User or copying it is discouraged; settings.py cannot hold model fields.

3. Final Answer:

   Create a separate model with OneToOneField to User and add birth_date there -> Option A

4. Quick Check:

   Extend User via OneToOneField profile model [OK]

Hint: Extend User with OneToOneField profile model [OK]

Common Mistakes:

• Trying to modify built-in User model directly
• Copying User model instead of extending
• Adding model fields in settings.py