Problem
You want to deploy your rails 3.2 application to another environment except production, but the default capistrano recipe for precompiling the assets keeps using the production environment as in:

 * executing `deploy:assets:precompile'
  * executing "cd /var/www/dev/app/releases/20120816130649 && rake RAILS_ENV=production RAILS_GROUPS=assets assets:precompile"
    servers: ["server.name.com"]

Solution
Add the following environment option in your deploy/other_env.rb file:

set :rails_env, "other_env"