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

This is what worked for me. Combine the steps given in this answer and comment by dB.

1. run rake db:migrate:status
2. If you have a ****NO FILE**** entry, just note the version number as noFileVersion. Note the version of the entry just above no file entry(stable_version).
3. created a "dummy" file with name noFileVersion_create_nothing.rb, and body

class CreateNothing < ActiveRecord::Migration 
  def change 
  end 
end

4. run rake db:migrate VERSION=stable_version
5. remove the noFileVersion_create_nothing.rb manually.
6. run rake db:migrate.
7. run rake db:migrate:status again to check if No file entry has disappeared.