From: x1 <caldridge@...>
Date: 2005-12-24T09:05:03+09:00
Subject: Re: How to sort this hash?

Thank you for the reply.

I tried adding your suggestions but ended up with an error:
>ruby array_test.rb
array_test.rb:19:in `[]': cannot convert String into Integer (TypeError)
	from array_test.rb:19
	from array_test.rb:18:in `map'
	from array_test.rb:18
	from array_test.rb:17:in `sort_by'
	from array_test.rb:17:in `each'
	from array_test.rb:17:in `sort_by'
	from array_test.rb:17
>Exit code: 1


The script is:

--------------------------------------

jobs = {
		"2231" => {"command" => "test_a.bash",
				"start_time" => "20051211",
				"stop_time" => "20051222"},
		"1131" => {"command" => "test_b.bash",
				"start_time" => "20051011",
				"stop_time" => "20051122"},
		"231" => {"command" => "test_c.bash",
				"start_time" => "20051215",
				"stop_time" => "20051227"}
	}

sort_keys = ["start_time", "stop_time"]
jobs.sort_by do |job|
	sort_keys.map do |key|
		job[key]
	end
end

On 12/23/05, Florian Gro� <florgro@gmail.com> wrote:
> x1 wrote:
>
> > Is it possible to sort the jobs hash below based on values such as
> > command, start_time and stop_time?
> >
> > Ideally, sort_by would be dynamically provided and I would output the
> > jobs entries based on the value defined for sort_by.
> >
> > sort_by = "start_time"  #<---- I'd like to use something like this to
> > define which job is listed first
> >
> > jobs = {
> >               "2231" => {"command" => "test_a.bash",
> >                               "start_time" => "20051211",
> >                               "stop_time" => "20051222"},
> >               "1131" => {"command" => "test_b.bash",
> >                               "start_time" => "20051011",
> >                               "stop_time" => "20051122"},
> >               "231" => {"command" => "test_c.bash",
> >                               "start_time" => "20051215",
> >                               "stop_time" => "20051227"}
> >       }
>
> sort_keys = ["start_time", "stop_time"]
> jobs.sort_by do |job|
>    sort_keys.map do |key|
>      job[key]
>    end
> end
>
> Note that this will only work as long as all sort_keys are present in
> every job.
>
> You might want to check the documentation for Enumerable#sort_by, but
> let me document the special thing in this case as well.
>
> sort_by's block can return multiple values as an Array. In that case it
> will first sort by the first value then by the second one and so on.
> This is used in the above sample where every job is sorted by the fields
> representing the sort_keys on that specific job.
>
> --
> http://flgr.0x42.net/
>
>
>