Rails - May 2006 - How do I check if something was eagerly loaded?

I''m looking for a way to check an item in memory to see if an  
association loaded.   I load the association in the controller and then  
in the view I need to check to see if the associated model loaded  
because I display an attribute of it.  Of course, if the model didn''t  
load, because it doesn''t exist, I get an error. For example, in my  
controller I have thus:

  def list
    @systems = System.find(:all, :order => ''name'', :include
=> :review)
  end

:review belongs to a :system, which has_one :review

In my view I do this:
<%= link_to_if !system.review.blank?, system.name, :action =>
''edit'',
:id => system.review %>

This doesn''t work, because it queries the database each time
(I''m
looping through a collection of 200 items).  So my question is, how can  
I get the link_to_if to check the memory object of review, or is there a  
different way to test this?  I would think that I could just check  
what''s in memory and not have to run another query for each item if I  
already loaded all of them.

Thanks.
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Did you ever figure out how to do this?  I want to do something very similar.

Thanks