Redis data model (key-value) - Mini Project: Build & Apply

Redis data model (key-value)

📖 Scenario: You are building a user profile system with Redis. You need to store user data, manage sessions with expiration, and use the right data types for different access patterns.

🎯 Goal: Store user profiles using hashes, manage sessions with TTL, and use lists for activity tracking.

📋 What You'll Learn

Store a user profile using a Redis hash

Create a session key with expiration

Track recent user activity with a list

Retrieve all data back to verify

💡 Why This Matters

🌍 Real World

Redis key-value patterns are the foundation of session management, caching, and real-time data systems at companies like Twitter, Instagram, and Stack Overflow.

💼 Career

Every backend developer needs to understand Redis data types to choose the right structure for caching, sessions, queues, and real-time features.

1

Store a user profile with HSET

Use HSET to store a user profile at key user:42 with fields: name set to "Alice", email set to "[e-mail]", and age set to "30".

Redis

# Store user 42's profile using HSET
# Your code here

Need a hint?

HSET key field value field value — sets multiple fields in one command.

2

Create a session with expiration

Use SET with the EX option to create a session key session:abc123 with value "user:42" that expires in 3600 seconds.

Redis

HSET user:42 name "Alice" email "[e-mail]" age "30"

# Create a session key that expires in 3600 seconds
# Your code here

Need a hint?

SET key value EX seconds — sets the key with an automatic expiration.

3

Track activity with a list

Use LPUSH to add three activities to the key activity:user:42: "login", "view_profile", and "update_email" in that order.

Redis

HSET user:42 name "Alice" email "[e-mail]" age "30"
SET session:abc123 "user:42" EX 3600

# Push 3 activities to the activity list
# Your code here

Need a hint?

LPUSH pushes elements to the left (head) of the list. Multiple values can be pushed in one command.

4

Retrieve all data

Write three commands: HGETALL user:42 to get the full profile, TTL session:abc123 to check session remaining time, and LRANGE activity:user:42 0 -1 to get all activities.

Redis

# Get profile, check session TTL, list activities
# Your code here

Need a hint?

HGETALL returns all fields and values. TTL returns seconds remaining. LRANGE 0 -1 returns the entire list.