Xavier Noria wrote:
> On Jan 21, 2008, at 12:23 PM, Max Williams wrote:
> 
>>
>> Can anyone tell me a nice and simple way of doing this?
> 
> Enumerable#parition or Set#classify might help.
> 
> -- fxn

hmmm...i couldn't work out how to make it easier with either of those. 
I ended up doing this, which isn't very clever but it did seem to work.

groups = []
vals = collection.collect{|obj| [obj.val1, obj.val2]}.uniq!
for val in vals
  groups << collection.select{|obj| obj.val1 == val[0] && obj.val2 = 
val[1]
end
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