Get the count of elements in a ruby range made of Time objects
range, ruby, time
Solution
There's no such method as `Range#size`, try `Range#count` (as suggested by Andrew Marshall), though it still won't work for a range of `Time` objects.
If you want to perform number-of-days computations, you're better off using `Date` objects, either by instantiating them directly (`Date.today - 31`, for example), or by calling `#to_date` on your `Time` objects.
`Date` objects can be used for iteration too:
((Date.today - 2)..(Date.today)).to_a
=> [#<Date: 2012-06-17 ((2456096j,0s,0n),+0s,2299161j)>,
#<Date: 2012-06-18 ((2456097j,0s,0n),+0s,2299161j)>,
#<Date: 2012-06-19 ((2456098j,0s,0n),+0s,2299161j)>]
((Date.today - 2)..(Date.today)).map(&:to_s)
=> ["2012-06-17", "2012-06-18", "2012-06-19"]
Problem
How would I be able to get the size or count of a range made up of `Time` objects? Something that would achieve the same result as my pseudo Ruby code, which doesn't work: ``` ((Time.now.end_of_day - 31.days)..(Time.now.end_of_day - 1.day)).size == 30 ``` currently doing the above gives an error: NoMethodError: undefined method `size' for 2012-05-18 23:59:59 -0400..2012-06-17 23:59:59 -0400:Range and trying to turn it into array `(range).to_a` : can't iterate from Time update Interesting, Just tried to do `((Date.today.end_of_day - 31.days)..(Date.today.end_of_day - 1.day)).count` Users/.../gems/ruby/1.9.1/gems/activesupport-3.0.15/lib/active_support/time_with_zone.rb:322: warning: Time#succ is obsolete; use time + 1 However `((Date.today - 31.days)..(Date.today - 1.day)).count == 31` I would be willing to settle for that? Also `((Date.today - 31.days)..(Date.yesterday)).count == 31` update 2 On the other hand, taking Mu's hint we can do: `(((Time.now.end_of_day - 31.days)..(Time.now.end_of_day - 1.day)).first.to_date..((Time.now.end_of_day - 31.days)..(Time.now.end_of_day - 1.day)).last.to_date).count == 31`