column_for

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 668
      def column_for(table_name, column_name)
        unless column = columns(table_name).find { |c| c.name == column_name.to_s }
          raise "No such column: #{table_name}.#{column_name}"
        end
        column
      end