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class BusinessEvent
def self.subclasses
subclasses = []
ObjectSpace.each_object(Module) {|m| subclasses << m if m.ancestors.include? self and m != self}
subclasses
end
end
class OrderEvent < BusinessEvent
end
class PurchaseEvent < BusinessEvent
end
class CustomerEvent < BusinessEvent
end
puts BusinessEvent.subclasses.inspect
# => [CustomerEvent, PurchaseEvent, OrderEvent]
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