Benito Serna Tips and tools for Ruby on Rails developers

Tool to run the benchmark for fixes for the latest-comment n+1 queries problem

What fix should you pick for your “latest-comment” n+1 queries problem?

One example of this problem is trying to get the latest comment on a list of posts, but there are others, like the last review in a list of products, or the cheapest price, or the latest payment for each costumer, etc…

I have already shared some fixes to help you solve the problem. and some benchmarks for this fixes….

This is the code that I use to run those benchmarks. You can use it to play with the code and seed values, to make it more specific to your current problem.

Benchmark structure

The benchmark will include the memory and the “iterations per second” benchmarks.

With this “reports"…

The link

You can see the code on github at bhserna/latest_comment_n-1_fixes_benchmark

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Do you want to solve n+1 queries with confidence?

Sign up to download free ebook, where I will show the basics on how to deal with n+1 problems.

  • Understand the methods (joins, includes, etc...) to work with associations.
  • Identify when active record will execute a query.
  • And the tools that can help you detect n+1 queries (like the bullet gem).