Interesting... That makes everything work as expected! Thanks

> There's some funky stuff with STI that basically boils down to the
> fact that if a class hasn't been loaded yet rails doesn't know it
> exists (and so doesn't create the correct query).
> One way of doing things is to force these classes to be loaded, eg at
> the bottom of person.rb put
> 
> require_dependency 'customer'
> require_dependency 'employee'
> require_dependency 'developer'


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