rake db:rollback not working?

Question

I\'m writing my first Rails app. I\'ve run a few rails generate model ... and rake db:migrate commands, but I now want to change my data model and

Answer 1

Solution (see my comment): run

rake db:migrate:status

and correct problems you find there. In this case (per @MarkThomas' followup), you might want to check all files you need are in place.