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Ruby on Rails: Compress the complexity of modern web apps

Safer to_i coercion, custom to_fs formats, and more! This Week in Rails: May 16, 2026 This Week in Rails: May 8, 2026 This Week in Rails: May 1, 2026 Active Record gets better every week Great big Rails World 2026 update: CFP, Corporate Support tickets, workshops Query command for database queries and more Explicit query: and body: kwargs for integration tests and more! Speedup ActiveRecord::LogSubscriber#sql_color and more! This Week in Rails: March 27, 2026 Rails Versions 8.0.5 and 8.1.3 have been released! Rails Versions 7.2.3.1, 8.0.4.1, and 8.1.2.1 have been released! This Week in Rails: March 20, 2026 Validate URI scheme in Action Text and more This Week in Rails: March 6, 2026 Planning Center is the newest Rails Foundation Contributing member Action Text gets Markdown conversion, editor links in devcontainers, and more! BARRA seeks Rails developer Joe Agliozzo is looking for a Rails developer The rise of lighttpd as the alternative web server When longer is better and more is more Snowdevil: First e-tailer on Rails Natural selection for frameworks in Ruby vs Java Address book tutorial in Portuguese Becoming a better programmer with Rails 10 Things Every Java Programmer Should Know About Ruby Really Getting Started in Rails Off the Treadmill, Onto the Rails Rails 0.9.5: A world of fixes and tweaks Rich clients with Rails and XUL
This week in Rails: 4.2.1, 4.1.10, new test runner and more!
David Heinemeier Hansson · 2015-03-21 · via Ruby on Rails: Compress the complexity of modern web apps

Hello Everyone!

This is Vipul from Pune, where it’s the Gudi-Padwa – or the Marathi New Year! Surrounded by garlands of sweets, lets head on to see, whats exciting this week.

P.S. Happy New Year!
P.P.S. Isn’t it a New Year, everyday somewhere around the World?

This week’s Rails contributors

36 people contributed to make Rails awesome this week. If you haven’t already, go ahead and watch Rails on GitHub to follow the discussions and find your first opprtunity to help out!

Rails 4.2.1 and 4.1.10 have been released!

After four release candidates, Rails 4.2.1 and 4.1.10 have finally been released! Thanks to all the contributors, for tons of fixes. Check out the full changes for 4.2.1 and 4.1.10 respectively.

New Stuff

bin/rails test runner

A new test runner – bin/rails test – has landed on master. This is the successor to the rake-based test runner, and includes a few rspec-inspired features that are not part of minitest, like running by line number, rerun snippets, or logs displayed with unicorns filled with rainbow colors.

Added rake initializers

Need to see all those initializers scattered in you application? Worry no more. Just run rake initializers! Did I mention they are sorted?

Improved

Use fullpath from Rack request

In Rack, request#fullpath returns the full path including the query string. This change uses fullpath from rack to avoid doing the same thing again in Rails. As a result, we also reduced some object allocations!

Fixed

Materialize subqueries by adding DISTINCT to suport MySQL 5.7.6+

In MySQL 5.7.6+, the default value for optimizer_switch has changed to derived_merge=on, which causes some issue with the subqueries generated by Rails. This change fixes that by adding a DISTINCT to the subqueries.

Don’t cast nil to string in postgres enums

Previously, nil values in PostgreSQL enums were casted to an empty string, which causes an error somewhere down the chain. But worry no more – this has now been fixed!

Summer Opportunities

Google Summer of Code 2015

Are you a student, or know someone who would love to contribute to Rails? Our GSoC students application is now open! Check out our ideas page and join us on the mailing list for discussion.

Rails Girls Summer of Code

Rails Girls Summer of Code is also accepting application! You can also consider submiting your open-source project to be included.

Wrapping up

That’s all for This week in Rails. As always, there are more changes than we have room to cover here, but feel free to check them out yourself!

P.S. If you enjoyed this newsletter, why not share it with your friends? :) If you wish to be part of this project please don’t hesitate to contact Godfrey – there’re a lot of ways you could help make this newsletter more awesome!