如何做rails db：在rails上同时迁移多个非主从关系的分片？

I have an app which which uses different database based on the subdomain. So essentially, the schema would be the same, but the data would differ for each databases. But when I release some new features and it would require some schema changes, I would need to run a command that would run on all databases configured in the I have an app which which uses different databa