Redhill Consulting provides a nice foreign_key_migrations plugin, which adds support for foreign keys within Rails' database migration framework; see Resources for a link to more info.

Redhill Consulting提供了一个很好的foreign_key_migrations插件，它增加了在Rail数据库迁移框架中对外键的支持；有关更多信息，请参看参考资料中的链接。