Question

I’m having a problem with my rake task hanging in an infinite loop. So far, I’ve been able to isolate the problem to a piece of code converting a date range to an array. Even if I directly invoke this:

(1.month.ago.beginning_of_month..1.month.ago.end_of_month).to_a.each {|d| p d}

the task hangs iterating over the same elements forever:

"2012-06-01 00:40:41 UTC"
"2012-06-01 00:40:41 UTC"
"2012-06-01 00:40:41 UTC"
"2012-06-01 00:40:41 UTC"
"2012-05-31 20:40:41 UTC"
"2012-05-31 20:40:41 UTC"
"2012-06-01 00:40:42 UTC"
"2012-06-01 00:40:42 UTC"
"2012-06-01 00:40:42 UTC"
"2012-06-01 00:40:42 UTC"
"2012-05-31 20:40:42 UTC"
"2012-05-31 20:40:42 UTC"
...

If instead I use this

(Date.new(2012,6,1)..Date.new(2012,6,30)).to_a.each {|d| p d}

everything works, so it has to be something with using ActiveSupport extensions for Date/Time specifically. Has anyone else seen this?

This happens in development environment on a Windows box with Rails 3.1 and Ruby 1.9.3, if that matters.

Answer 1

You are creating a Time range for a month with 1 second increments and ~2.5 million entries:

(1.month.ago.beginning_of_month..1.month.ago.end_of_month)
# => Fri, 01 Jun 2012 00:00:00 CEST +02:00..Sat, 30 Jun 2012 23:59:59 CEST +02:00
1.month.ago.beginning_of_month.succ
# => Fri, 01 Jun 2012 00:00:01 CEST +02:00

To create a Date range use:

(1.month.ago.beginning_of_month.to_date..1.month.ago.end_of_month.to_date)
# => Fri, 01 Jun 2012..Sat, 30 Jun 2012
1.month.ago.beginning_of_month.to_date.succ
# => Sat, 02 Jun 2012