Method: Kernel#hierarchical_send

Defined in:
lib/core/facets/kernel/hierarchical_send.rb

#hierarchical_send(method_name, *args, &block) ⇒ Object

TODO:

Include singleton class?

Send a message to each ancestor in an object’s class hierarchy. The method will only be called if the method is defined for the ancestor.

This can be very useful for setting up a preinitialize system.

m = Module.new do
      attr :a
      def preinitialize
        @a = 1
      end
    end

c = Class.new do
      include m
      def initialize
        hierarchical_send(:preinitialize)
      end
    end

c.new.a  #=> 1



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# File 'lib/core/facets/kernel/hierarchical_send.rb', line 28

def hierarchical_send(method_name, *args, &block)
  method_name = method_name.to_s if RUBY_VERSION < '1.9'
  this = self
  self.class.hierarchically do |anc|
    ## is there really no better way to check for the method?
    if anc.instance_methods(false).include?(method_name) or
         anc.public_instance_methods(false).include?(method_name) or
         anc.private_instance_methods(false).include?(method_name) or
         anc.protected_instance_methods(false).include?(method_name)
      im = anc.instance_method(method_name)
      ##im.arity == 0 ? im.bind(this).call(&block) : im.bind(this).call(*args, &block)
      im.bind(this).call(*args, &block)
    end
  end
end