How can I optimize Active Record queries in Rails?

How can I optimize Active Record queries in Rails?

To optimize Active Record queries, you can use methods like select, includes, and joins to reduce database load.

What is the difference between includes and joins?

includes loads associated records in a single query, while joins creates an inner join, fetching only the specified fields.

Are there any tools to analyze query performance?

Yes, you can use tools like Bullet, Scout APM, or the built-in Rails query logs to analyze and optimize performance.

Can you give an example of using select in a query?

Sure! Instead of fetching all columns, you can use User.select(:id, :name).where(active: true) to get only the id and name of active users.