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Rails迁移入门
9、 迁移任务是一段符合特定格式的Ruby代码，相关文件统一存放在应用的db/migrate目录中。按照命名规范，文件名通常以三位数字的版本号开头，后接一个下划线，例如：001_create_users.rb。这种命名方式有助于系统按顺序识别和执行数据库结构变更操作。
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