Rails - Feb 2008 - putting a calculation method in the model

Do I need to define @duration somewhere?  I want to calculate the 
duration of a call in the model and then for the view to display that 
calculation.

Right now, the view, show.rhtml for calls, is giving an "You have a nil 
object when you didn''t expect it!" error :(


thufir@arrakis ~/goodfellow-tool $ 
thufir@arrakis ~/goodfellow-tool $ cat app/views/calls/show.rhtml -n | 
head -n 9 | tail -n 1
     9  <p> The call duration was <%= @call.duration.to_s %> long.
</p>
thufir@arrakis ~/goodfellow-tool $           
thufir@arrakis ~/goodfellow-tool $ cat app/models/call.rb 
class Call < ActiveRecord::Base

  def duration
    return (@end - @start).to_time
  end

end
thufir@arrakis ~/goodfellow-tool $ 



the trunk where the code is at:
http://code.google.com/p/goodfellow-tool/source/browse

thanks,

Thufir


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