From: Michael Guterl <mguterl@...>
Date: 2008-09-26T04:04:37+09:00
Subject: Re: Bug in the money gem?

On Thu, Sep 25, 2008 at 2:34 PM, Eric LIn <ericlin852@gmail.com> wrote:
> For anyone of you using the money gem (http://dist.leetsoft.com/api/
> money/), I noticed today that 0 - 100 does not equal -100, it equals
> 100 instead (all numbers here represent Money objects).  Do any of you
> find that odd?
>
I'm not sure, but it seems a bit strange.  Here is the offending code:

    # File lib/money/money.rb, line 79
79:   def -(other_money)
80:     return other_money.dup if cents.zero?
81:     return dup if other_money.cents.zero?
82:
83:     if self.cents == 0 or currency == other_money.currency
84:       Money.new(cents - other_money.cents, other_money.currency)
85:     else
86:       Money.new(cents - other_money.exchange_to(currency).cents, currency)
87:     end
88:   end

I think the first return would make sense if the other_money variable
had a negative value associated with it, however, other_money's value
is not negative.

HTH,
Michael Guterl