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View collect_subclasses.rb
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class BusinessEvent
def self.inherited(clazz)
subclasses << clazz
end
def self.subclasses
@@subclasses ||= []
end
end
 
class OrderEvent < BusinessEvent
end
 
class PurchaseEvent < BusinessEvent
end
 
class CustomerEvent < BusinessEvent
end
 
puts BusinessEvent.subclasses.inspect
# => [OrderEvent, PurchaseEvent, CustomerEvent]
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