From: Todd Benson <caduceass@...>
Date: 2009-04-30T04:24:48+09:00
Subject: Re: Finding Matches in Array of Classes

On Wed, Apr 29, 2009 at 2:21 PM, Todd Benson <caduceass@gmail.com> wrote:
> On Wed, Apr 29, 2009 at 2:03 PM, Rob Redmon <rob.webinator@gmail.com> wrote:
>>
>> I have an ActiveRecord find result.  An element's contents look like:
>>
>> irb(main):090:0> results[0]
>> => #<InventoryHour id: 47475, observation_time: "2008-01-01 00:00:00",
>> station_id: 6, extension_id: 22, disk: 4, archive: 0, updated_on:
>> "2009-04-15 15:57:16">
>>
>> The class of "observation_time" is:
>> results[0].observation_time.class
>> => Time
>>
>>
>> What I'd like to do is find those elements which match on a particular
>> range of "observation_time".  I'm used to Matlab and IDL programming
>> where one just does something like this:
>>
>> indices = where( results.observation_time >= "2008-1-1" and
>> results.observation_time < "2009-1-1" )
>>
>> What's the ruby way?  Obviously, I can't use Array.include? but
>> something like that would be nice.
>
> Depends.  This might work (just an example)...
>
> d = Time.now
> e = Time.now + 1
> f = Time.now + 2
> (d..f).include? e
> => true

beware, though, since (d...e).include?(e) is false, but
(d...e).include?(d) is true.

Todd