active-record-querying

What problem does it solve?

This Skill helps you write efficient, correct, and maintainable Active Record queries in Rails, preventing common performance pitfalls like N+1 queries and unnecessary memory usage.

Core Features & Use Cases

• Query Optimization: Learn to use includes, preload, eager_load, and joins correctly to prevent N+1 problems.
• Data Retrieval: Efficiently fetch single records, collections, or specific attributes using methods like find, find_by, pluck, and pick.
• Use Case: You have a Post model with many Comment associations. To display posts along with their comments without N+1 queries, you'll use Post.includes(:comments).

Quick Start

Use the active-record-querying skill to find all posts that have comments.