quote

# File activerecord/lib/active_record/connection_adapters/abstract/quoting.rb, line 6
      def quote(value, column = nil)
        # records are quoted as their primary key
        return value.quoted_id if value.respond_to?(:quoted_id)

        case value
          when String, ActiveSupport::Multibyte::Chars
            value = value.to_s
            if column && column.type == :binary && column.class.respond_to?(:string_to_binary)
              "'#{quote_string(column.class.string_to_binary(value))}'" # ' (for ruby-mode)
            elsif column && [:integer, :float].include?(column.type)
              value = column.type == :integer ? value.to_i : value.to_f
              value.to_s
            else
              "'#{quote_string(value)}'" # ' (for ruby-mode)
            end
          when NilClass                 then "NULL"
          when TrueClass                then (column && column.type == :integer ? '1' : quoted_true)
          when FalseClass               then (column && column.type == :integer ? '0' : quoted_false)
          when Float, Fixnum, Bignum    then value.to_s
          # BigDecimals need to be output in a non-normalized form and quoted.
          when BigDecimal               then value.to_s('F')
          when Date                     then "'#{value.to_s(:db)}'"
          when Time, DateTime           then "'#{quoted_date(value)}'"
          else                          "'#{quote_string(value.to_yaml)}'"
        end
      end