Class method call via the singleton or not

Hi–

Little bit of conundrum. I have a variables that tracks information
about methods. So it needs to work within the context of the class
hierarchy. At the same time I need to access that information from the
instance level. I worked it out with one exception --singleton, b/c I
do something like:

class Foo

def self.dolist( name )
  list = nil
  ancestors.each do |a|
    if d = a.instance_variable_get("@dolist")
      list = d[name.to_sym]
      break if list
    end
  end
  list
end

def foo
  self.class.dolist()
end

end

This works unless there is singleton in the hierarchy that has @dolist
defined. But I don’t want to call directly on the singleton in foo in
case the singleton doesn’t exist --I think that would be an exceedingly
inefficient. Is there another way?

Thanks,
T.

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