Rails - Apr 2006 - Using variable class names breaks has_many?

Hey All,

Any idea why this would work this this:

class Dog
  has_many :fleas
end

dog = Dog.find_first
dog.name   =>  "Buster"
dog.class   =>  Dog
dog.fleas    =>  []

# store the class
animal_class = dog.class   =>  Dog

dog = animal_class.find_first
dog.name   =>  "Buster"
dog.class   =>  Dog
dog.fleas    =>  method_missing!     # hunh?

# but this works again
dog = Dog.find_by_id(dog.id)
dog.fleas   =>  []

Is there some AR magic that gets broken by using a variable class name?

Thanks!

- Isaac
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