1. HyperLogLogs in Redis

    Learn what a HyperLogLog is and how you can use it to count billions of unique things.

    Calle Erlandsson

  2. Fundamentals of Test-Driven Development, Now on Upcase

    Learn how to use Test-Driven Development to write better software in our newest Upcase trail.

    Chris Toomey and Geoff Harcourt

  3. thoughtbot Ruby Open Source is Ready for Rails 5

    Upgrade all the things!

    Tute Costa

  4. How To Reduce a Large Heroku Slug Size

    How to fix the “Compiled slug size: 500.6M is too large (max is 500M)” error when trying to deploy your Heroku app.

    Dan Croak

  5. Your Program is a Special and Unique Snowflake

    Simplify and clarify your code by carefully choosing abstractions.

    Joe Ferris

  6. Action Mailer and Active Job sitting in a tree...

    Getting started with Action Mailer and Active Job.

    Elle Meredith

  7. My issues with Let

    let can lead to bloat. Be careful.

    Jason Draper

  8. Paperclip IS vulnerable to ImageTragick

    Paperclip is affected by CVE-2016–3714 if used with ImageMagick 7.0.1-0 or earlier.

    Tute Costa

  9. ImageMagick vulnerability does not affect Paperclip

    There is no need to upgrade Paperclip in light of CVE-2016–3714. You may choose to upgrade ImageMagick regardless.

    Tute Costa

  10. Blocks, Procs, and Enumerable

    A look under the hood at how blocks and procs are used in Ruby.

    Joël Quenneville

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