Desfazendo coisas no Rails

gistfile1.sh

$ rails generate controller Noticias titulo
$ rails destroy  controller Noticias titulo
 
$ rails generate model Noticia titulo:string
$ rails destroy model Noticia

$ rake db:migrate
$ rake db:rollback
 
$ rake db:migrate VERSION=0 #defaz todas as migrations, deixa o banco "limpo"

$ rake db:migrate:reset #reseta todo o banco, perdendo todos os registros, e já executa novamente as todas as migrations

$ bundle exec rake assets:clobber(Removes all compiled assets)
$ bundle exec rake assets:precompile (Precompiled assets again)