输入清单4中的命令迁移原始版本的所有剩余实例。
Enter the command shown in Listing 4 to migrate all the remaining instances of the original version.
这样做的目的是为了让您能继续使用 Rake 命令迁移数据库、运行测试等等。
The purpose of this to enable you to still use the Rake commands to migrate your database, run your tests, and so on.
迁移命令看上去很简单，但过程中发生的问题会很复杂，难以解决。
The migration command can look simple, but the issues occurring in the process can be complex and difficult to resolve.
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