Query parameters for filtering in Rest API - Mini Project: Build & Apply

Query Parameters for Filtering in REST API

📖 Scenario: You are building a simple REST API for a bookstore. The API should allow users to get a list of books and filter them by genre using query parameters.

🎯 Goal: Build a REST API endpoint that returns a filtered list of books based on the genre query parameter.

📋 What You'll Learn

Create a list of books with title and genre

Add a query parameter variable to capture the genre filter

Filter the list of books by the genre query parameter

Return the filtered list as JSON output

💡 Why This Matters

🌍 Real World

Filtering data using query parameters is common in APIs to let users get only the information they want.

💼 Career

Understanding query parameters and filtering is essential for backend developers working with REST APIs.

1

Create the initial list of books

Create a list called books with these exact dictionaries: {'title': 'The Hobbit', 'genre': 'Fantasy'}, {'title': '1984', 'genre': 'Dystopian'}, {'title': 'To Kill a Mockingbird', 'genre': 'Classic'}, {'title': 'The Great Gatsby', 'genre': 'Classic'}

Rest API

# Create the list of books with title and genre
# Your code here

Need a hint?

Use a list of dictionaries to store the books with their titles and genres.

2

Add a query parameter variable for genre

Create a variable called genre_filter and set it to the string 'Classic' to simulate receiving a query parameter.

Rest API

books = [
    {'title': 'The Hobbit', 'genre': 'Fantasy'},
    {'title': '1984', 'genre': 'Dystopian'},
    {'title': 'To Kill a Mockingbird', 'genre': 'Classic'},
    {'title': 'The Great Gatsby', 'genre': 'Classic'}
]
# Create a variable genre_filter and set it to 'Classic'
# Your code here

Need a hint?

Set the genre_filter variable to the genre you want to filter by.

3

Filter the books list by genre

Create a new list called filtered_books using a list comprehension that includes only books where the genre matches genre_filter.

Rest API

books = [
    {'title': 'The Hobbit', 'genre': 'Fantasy'},
    {'title': '1984', 'genre': 'Dystopian'},
    {'title': 'To Kill a Mockingbird', 'genre': 'Classic'},
    {'title': 'The Great Gatsby', 'genre': 'Classic'}
]
genre_filter = 'Classic'
# Create filtered_books list with books matching genre_filter
# Your code here

Need a hint?

Use a list comprehension to select books where book['genre'] equals genre_filter.

4

Print the filtered books list

Use print(filtered_books) to display the filtered list of books.

Rest API

books = [
    {'title': 'The Hobbit', 'genre': 'Fantasy'},
    {'title': '1984', 'genre': 'Dystopian'},
    {'title': 'To Kill a Mockingbird', 'genre': 'Classic'},
    {'title': 'The Great Gatsby', 'genre': 'Classic'}
]
genre_filter = 'Classic'
filtered_books = [book for book in books if book['genre'] == genre_filter]
# Print the filtered_books list
# Your code here

Need a hint?

Use print(filtered_books) to show the filtered list.