class ChangeStoryPermalinkColumn < ActiveRecord::Migration
  def up
    change_column :stories, :permalink, :text
  end
end

class ChangeStoryPermalinkColumn < ActiveRecord::Migration
  def up
    change_column :stories, :permalink, :text
  end

  def down
    change_column :stories, :permalink, :string
  end
end

Add down migration for change_column type
Add down migration for change_column type
