ActiveRecord Playground

A minimal environment to practice ActiveRecord queries, associations and performance — without Rails magic.

Why this exists

ActiveRecord is often learned by memorizing methods, not by understanding SQL behavior. This playground encourages experimentation and observation.

Features

• ActiveRecord without Rails
• SQLite database
• Faker-seeded data
• Interactive console
• Progressive query exercises

Setup

ruby scripts/setup.rb

Start the console

ruby playground.rb

Exercises

Exercises are organized by difficulty:

• exercises/level_1_basic_queries.md
• exercises/level_2_associations.md
• exercises/level_3_joins_includes.md
• exercises/level_4_aggregations.md
• exercises/level_5_performance.md

Open a level file and run queries in the console.

Reset data

ruby scripts/reset_db.rb