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A comment on Upgrading GitHub to Rails 3 with Zero Downtime. Parent comment

Re:Upgrading GitHub to Rails 3 with Zero Downtime by elektronaut on Monday September 15, 2014 @08:11PM (#8322349)
Upgrading to 3.0 is a nice milestone, especially if you're porting over a large app.

ActiveRecord 3.x still supports the query interface used in 2.3, I'm guessing this is how they're able to run both versions from the same codebase.

I'm not sure which Ruby version GitHub is on, but Rails 4 requires Ruby 1.9+. Running Rails 2.3 on Ruby 1.9+ is doable but tricky.

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Re:Upgrading GitHub to Rails 3 with Zero Downtime by alttab on Monday September 15, 2014 @08:28PM (#8322399)
Confirmed with 2.3 and 1.9+. We had a ton of encoding issues with that combination. We had to ensure every single thing was encoded properly.
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