type_to_sql (ActiveRecord::ConnectionAdapters::MysqlAdapter)

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 500
          def type_to_sql(type, limit = nil, precision = nil, scale = nil)
            return super unless type.to_s == 'integer'

            case limit
            when 1; 'tinyint'
            when 2; 'smallint'
            when 3; 'mediumint'
            when nil, 4, 11; 'int(11)'  # compatibility with MySQL default
            when 5..8; 'bigint'
            else raise(ActiveRecordError, "No integer type has byte size #{limit}")
            end
          end