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。

youdao

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。

youdao

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。

youdao