class Rails::Railtie

def each_registered_block(type, &block)

run `&block` in every registered block in `#register_block_for`

def each_registered_block(type, &block)
  klass = self.class
  while klass.respond_to?(type)
    klass.public_send(type).each(&block)
    klass = klass.superclass
  end
end