Reversible Data Migration
Need to update a small amount of data in migration? But still want to make it reversable? Reversable Data Migration comes to the rescue.
Example usage
ruby
class RemoveStateFromProduct < ActiveRecord::Migration
def self.up
backup_data = []
Product.all.each do |product|
backup_data << {:id => product.id, :state => product.state}
end
backup backup_data
remove_column :products, :state
end
def self.down
add_column :products, :state, :string
restore Product
end
end
## Installing
gem install reversible_data_migration