If you want to start using migrations with an existing database, you can snapshot your existing schema with rake schema_dump.

如果想对现有数据库使用迁移，可以用rake schema_dump对现在的模式做个快照。

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Snapshot publications completely refresh the schema at the Subscriber every time synchronization occurs, so all schema changes are applied to the Subscriber.

每次发生同步时，快照发布都会彻底刷新订阅服务器上的架构，因此所有架构更改都会应用到订阅服务器。

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