Why caching matters for performance in Django - See It in Action

Why caching matters for performance

📖 Scenario: You are building a simple Django web app that shows a list of popular books. Each time a user visits the page, the app fetches the book data from a slow database query. To make the page load faster, you want to use caching.

🎯 Goal: Build a Django view that caches the list of books for 60 seconds. This will reduce the number of slow database queries and improve page load speed.

📋 What You'll Learn

Create a list of book titles as initial data

Set a cache timeout variable for 60 seconds

Use Django's cache framework to store and retrieve the book list

Return the cached book list in the view response

💡 Why This Matters

🌍 Real World

Caching is used in real websites to speed up pages by storing data temporarily, so users get faster responses without waiting for slow database queries every time.

💼 Career

Understanding caching is important for backend developers to optimize web app performance and reduce server load.

1

Create the initial book list data

Create a variable called book_list that contains this exact list of strings: ["The Hobbit", "1984", "Pride and Prejudice"]

Django

# Create the book_list variable with the exact titles
# Your code here

Need a hint?

Use a Python list with the exact book titles inside square brackets.

2

Set the cache timeout duration

Create a variable called cache_timeout and set it to the integer 60 to represent 60 seconds

Django

book_list = ["The Hobbit", "1984", "Pride and Prejudice"]
# Set cache_timeout to 60 seconds
# Your code here

Need a hint?

Just assign the number 60 to the variable named cache_timeout.

3

Use Django cache to store and retrieve book list

Import cache from django.core.cache. Then write a function called get_books() that tries to get book_list from cache with key 'books'. If not found, it sets the cache with book_list and cache_timeout, then returns the list.

Django

book_list = ["The Hobbit", "1984", "Pride and Prejudice"]
cache_timeout = 60

# Import cache and define get_books function
# Your code here

Need a hint?

Use cache.get('books') to try fetching cached data. If it returns None, use cache.set('books', book_list, cache_timeout) to save it.

4

Complete the Django view to return cached books

Write a Django view function called book_view that calls get_books() and returns an HttpResponse with the book titles joined by commas. Import HttpResponse from django.http.

Django

from django.core.cache import cache
from django.http import HttpResponse

book_list = ["The Hobbit", "1984", "Pride and Prejudice"]
cache_timeout = 60

def get_books():
    books = cache.get('books')
    if books is None:
        cache.set('books', book_list, cache_timeout)
        books = book_list
    return books

# Define book_view function to return HttpResponse with cached books
# Your code here

Need a hint?

Use HttpResponse to send the book titles as a comma-separated string.