* Reset the `ActiveRecord::Base` connection after `rails db:migrate:name`
When `rails db:migrate` has finished, it ensures the `ActiveRecord::Base` connection is reset to its original configuration. Going forward, `rails db:migrate:name` will have the same behavior.
*Kyle Thompson*
* Disallow calling `connected_to` on subclasses of `ActiveRecord::Base`.
Behavior has not changed here but the previous API could be misleading to people who thought it would switch connections for only that class. `connected_to` switches the context from which we are getting connections, not the connections themselves.