What is the N+1 query issue in Rails?

What is the N+1 query issue in Rails?

The N+1 query issue occurs when an application makes one query to retrieve a list of records and then makes additional queries for each record to retrieve associated data, leading to performance problems.

How can I identify if my Rails app has this issue?

You can identify the N+1 query issue by using tools like the Bullet gem, which alerts you to N+1 queries in your development environment.

What are some ways to fix the N+1 query issue?

You can fix it by using eager loading with the includes method to load associated records in a single query.

Can you give me an example of eager loading in Rails?

Sure! Instead of Post.all, you can use Post.includes(:comments).all to load posts along with their comments in one query.