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Re:Git Push Heroku Master: Now 40% Faster by kmtrowbr on Tuesday February 11, 2014 @03:33PM (#7220227)
I have been using this asset_sync gem (with Ruby on Rails), together with S3 & Cloudfront, for 2 years and it works wonderfully: https://github.com/rumblelabs/asset_sync

I basically never think about deploying assets. It nearly always just works.

Re:Git Push Heroku Master: Now 40% Faster by josephlord on Tuesday February 11, 2014 @08:04PM (#7221798)
It works but they are a bit slow on merging pull requests. I'm currently using a fork so that CORS can work on Rackspace. I think this sort of issue is why Heroku no longer recommend this approach.
Re:Git Push Heroku Master: Now 40% Faster by neilmiddleton on Wednesday February 12, 2014 @05:34AM (#7223560)
It's not recommended as asset precompilation usually requires access to the environment (e.g a DB connection), and thus isn't deterministic.