Actually, I was looking at the parameters in the wrong order. I need
the - operator from the to_date wich is the TimeWithZone. That's
defined here:
def -(other)
# If we're subtracting a Duration of variable length (i.e.,
years, months, days), move backwards from #time,
# otherwise move backwards #utc, for accuracy when moving across
DST boundaries
if other.acts_like?(:time)
utc - other
elsif duration_of_variable_length?(other)
method_missing(:-, other)
else
result = utc.acts_like?(:date) ? utc.ago(other) : utc - other
rescue utc.ago(other)
result.in_time_zone(time_zone)
end
end
The rails console tells me I should hit the first condition, resulting
in a Time (which doesn't support abs). I still haven't found the
magic that makes this work in production.
Loading development environment (Rails 2.2.2)
>> a = DateTime.now
=> Sun, 05 Jul 2009 01:55:13 -0400
>> a.class
=> DateTime
>> b = Time.zone.now
=> Sun, 05 Jul 2009 05:55:31 UTC +00:00
>> b.class
=> ActiveSupport::TimeWithZone
>> c=b-a
=> Thu Jan 01 00:00:18 UTC 1970
>> c.class
=> Time
>>
On Jul 5, 1:02 am, Brian <[email protected]> wrote:
> I have a DateTime object (from DateTime.now), and an
> ActiveSupport::TimeWithZone object (comes from a date in the DB). I'm
> passing these values to the helper method distance_of_time_in_words:
>
> <%= distance_of_time_in_words(DateTime.now, @myinstance.mydate) %>
>
> In the implementation of this helper is the following:
>
> distance_in_minutes = (((to_time - from_time).abs)/60).round
>
> In production, this works as expected. In testing, this results in:
>
> ActionView::TemplateError: undefined method `abs' for Sun Oct 26
> 19:49:44 UTC 1980:Time
>
> Here's where it gets strange. I opened this up in the debugger in
> both environments. In test, a DateTime minus a TimeWithZone gives me
> a Time. Time doesn't have an abs method, so this fails with a
> NoMethod exception. In production a DateTime minus a TimeWithZone
> results in a Rational, which does have abs!
>
> Why the different behavior in these two environments? I don't see the
> DateTime minus operator being redefined by rails anywhere, but maybe
> I'm not looking in the right place. I'm using Rails version 2.2.2.
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