Alter_table is a project mainly written in Ruby, based on the MIT license.
Rails Plugin: perform multiple mysql table schema operations simultaneously
alter_table allows you to modify several properties of a mysql table simultaneously.
Instead of issuing individual add_column table_name, column_name, type statements, you can bundle these calls up in a block.
alter_table 'games' do |t| t.add_column 'body_class', :string t.add_column 'no_good', :boolean, :default => true, :null => false end