I feel your pain.  I just posted about this after hitting the same issue 
at work today.  I must have spent a few hours trying to figure out what 
was wrong with our model, because in our case 'target' was an 
association itself, which meant that the consequences of using it were 
much stealthier and weirder:

http://www.rubyfu.com/2007/06/transparent-proxies-part-2.html

--Brendan

Josh on Rails wrote:
>  I'm working on a cost estimation tool, that allows each estimate created 
>  to
>  override base assumptions of price, cost, etc.
>  
>  Everything was fine, until we said, "Let's add a 'target net revenue'
>  property."
>  
>  So, the resource model got a "target" column. The override model got a
>  "new_target" column.
>  
>  But, whenever I set resource.target, I don't get a resource at the end; 
>  I
>  get target. In other words:
>  
>  old_resource = resource.clone
>  resource.target = new_target
>  resource == old_resource # false
>  resource == new_target # true


-- 
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