cast_value

# File activerecord/lib/active_record/connection_adapters/postgresql/oid/money.rb, line 16
          def cast_value(value)
            return value unless ::String === value

            # Because money output is formatted according to the locale, there are two
            # cases to consider (note the decimal separators):
            #  (1) $12,345,678.12
            #  (2) $12.345.678,12
            # Negative values are represented as follows:
            #  (3) -$2.55
            #  (4) ($2.55)

            value = value.sub(/^\((.+)\)$/, '-\1') # (4)
            case value
            when /^-?\D*+[\d,]+\.\d{2}$/  # (1)
              value.delete!("^-0-9.")
            when /^-?\D*+[\d.]+,\d{2}$/  # (2)
              value.delete!("^-0-9,")
              value.tr!(",", ".")
            end

            super(value)
          end