const_missing

# File activesupport/lib/active_support/dependencies.rb, line 477
  def const_missing(const_name)
    if [Object, Kernel].include?(self) || parent == self
      super
    else
      begin
        begin
          Dependencies.load_missing_constant self, const_name
        rescue NameError
          parent.send :const_missing, const_name
        end
      rescue NameError => e
        # Make sure that the name we are missing is the one that caused the error
        parent_qualified_name = Dependencies.qualified_name_for parent, const_name
        raise unless e.missing_name? parent_qualified_name
        qualified_name = Dependencies.qualified_name_for self, const_name
        raise NameError.new("uninitialized constant #{qualified_name}").copy_blame!(e)
      end
    end
  end