E1: After rake:db:rollback, Rails 4.0

Using Rails 4.0:

After rolling back the combine_items_in_cart migration, we expect to be able to view the contents of the cart without the items combined.

I get ActiveRecord::PendingMigrationError instead.

In the changelog for Rails 4.0, we have:
“Added ActiveRecord::Migration.check_pending! that raises an error if migrations are pending.”

How can we do what the book does, and roll back a migration and view the app in the pre-migration state? Is this really a new thing for Rails 4.0?

Thanks, Sean

With Rails 4, you need to rename the file (so it isn’t considered pending). Look for the ‘mv’ commands before and after the third get /carts/1 in the following page:

http://intertwingly.net/projects/AWDwR4/checkde…

I’ll update the book to mention this. Thanks!