In rails 3.x, To create a controller with actions we use this command
$ rails generate controller UserController add edit
If you want to remove the above controller and the actions
$ rails destroy controller User add edit
Model
To create a model in rails 3
$ rails generate model User name:string mobile:string
This can be undone using
$ rails destroy model User
Database migration and rollback
To migrate the state of the database using
$ rake db:migrate
We can undo a single migration by this command
$ rake db:rollback
To go all the way back to the beginning by this command
$ rake db:migrate VERSION=0
These commands may be helpful for reverting controller, model and database migration specific changes.
