Rails - Nov 2006 - Using <=> in models

Hi *,
I''m going mad because I''m not able to implement a custom sort
on an
array of models.
The order must be by type, where type are custom strings, so Subject  
 > LessonPlan > Assignment > Resource and if the type is the same by  
date using a datetime field (created_at).

   def <=>(other)
     if self["type"] == "Subject"
       return +1
     elsif other["type"] == "Subject"
       return -1
     elsif self["type"] == "LessonPlan"
       return +1
     elsif other["type"] == "LessonPlan"
       return -1
     elsif self["type"] == "Assignment"
       return +1
     elsif other["type"] == "Assignment"
       return -1
     elsif self["type"] == other["type"]
       return self.created_at <=> other.created_at
     end
   end

The resulting array (after calling sort) is not ordered at all, on 2  
Resource and 1 Assignment the Assignment is the last ...
Someone with a clue of what''s happening ? :)

TIA,
   ngw

-- 
Nicholas Wieland
nicholas_wieland@yahoo.it



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