I'd recommend migrating to the latest version of 2.3 (2.3.14) before doing anything. Once you are on 2.3.14 you should run your tests and check your logs for any warnings and fix them. Once any issues are resolved, go ahead and try upgrading to 3.1.1. I think the largest change from 3.0 to 3.1 was the asset pipeline and you can ignore it while upgrading. As for resources, both PeepCode and RailsCasts offer great guides for doing exactly what you want.
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我建议在执行任何操作之前迁移到最新版本 2.3 (2.3.14)。一旦您进入 2.3.14，您应该运行测试并检查日志中是否有任何警告并修复它们。一旦任何问题得到解决，请继续尝试升级到 3.1.1。我认为3.0到3.1最大的变化是资产管道，升级时可以忽略它。至于资源，PeepCode 和 RailsCasts 提供了很好的指南，帮助您准确地完成您想要的操作。
I'd recommend migrating to the latest version of 2.3 (2.3.14) before doing anything. Once you are on 2.3.14 you should run your tests and check your logs for any warnings and fix them. Once any issues are resolved, go ahead and try upgrading to 3.1.1. I think the largest change from 3.0 to 3.1 was the asset pipeline and you can ignore it while upgrading. As for resources, both PeepCode and RailsCasts offer great guides for doing exactly what you want.