The database query that you want is foo.odometer IS NULL (for when it
has not been set) or IS NOT NULL (for when it has ben set).
You could google ActiveRecord and "IS NULL" and see if you find hits. I
*think* the code does this correctly. e.g.
Table.find(:all, :conditions => { :odomiter => nil })
Try it, look at the log and see if you get the right query. Last
resort, you can do the SELECT query yourself.
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