RubyMoney/money · error · TypeError

Can't add or subtract a non-zero #{value.class.name} value

Error message

Can't add or subtract a non-zero #{value.class.name} value

What it means

Error "Can't add or subtract a non-zero #{value.class.name} value" thrown in RubyMoney/money.

Source

Thrown at lib/money/money/arithmetic.rb:153

    #
    #   @param [Money] other Other +Money+ object to subtract.
    #   @return [Money]
    #
    #   @example
    #     Money.new(100) - Money.new(99) #=> #<Money @fractional=1>
    [:+, :-].each do |op|
      non_zero_message = lambda do |value|
        "Can't add or subtract a non-zero #{value.class.name} value"
      end

      define_method(op) do |other|
        case other
        when Money
          other = other.exchange_to(currency)
          new_fractional = fractional.public_send(op, other.fractional)
          dup_with(fractional: new_fractional)
        when CoercedNumeric
          raise TypeError, non_zero_message.call(other.value) unless other.zero?

          dup_with(fractional: other.value.public_send(op, fractional))
        when Numeric
          raise TypeError, non_zero_message.call(other) unless other.zero?

          self
        else
          raise TypeError, "Unsupported argument type: #{other.class.name}"
        end
      end
    end

    # Multiplies the monetary value with the given number and returns a new
    # +Money+ object with this monetary value and the same currency.
    #
    # Note that you can't multiply a Money object by an other +Money+ object.
    #
    # @param [Numeric] value Number to multiply by.

View on GitHub (pinned to 26e2829c34)

When it happens

Trigger: Thrown at lib/money/money/arithmetic.rb:153 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of RubyMoney/money@26e2829c34 (2026-08-23). Data as JSON: /api/errors/835c7d51053a27ce. Report an issue: GitHub.