mysql_adapter_column_order_support.rb

# Allows you to specify the position of a column in your migrations' add_column and change_column calls.
ActiveRecord::ConnectionAdapters::MysqlAdapter.class_eval do
  def add_column_options!(sql, options)
    super
    if options[:after]
      sql << " AFTER #{quote_column_name(options[:after])}"
    elsif options[:first]
      sql << " FIRST"
    end
  end
end