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Re:Ruby 1.9.1 Released: First Stable Ruby 1.9 Release by sho on Friday January 30, 2009 @10:10PM (#459169)
I think Rails itself works, the problem is the servers. Mongrel doesn't work on 1.9, and the others have problems too. Also the DB libraries.

Plenty of other gems don't work either, basic ones like JSON (works only in pure Ruby mode). Hopefully the stable 1.9 release spurs maintainers on a bit, but I imagine it'll take a while.

Re:Ruby 1.9.1 Released: First Stable Ruby 1.9 Release by catch23 on Saturday January 31, 2009 @03:42AM (#459388)
Then there are the DB libraries that only work in 1.9 like NeverBlock.