def visit(name)
      child = object.public_send(name)
      child_label(name)
      visit_child(child)
    end
def visit(name)
      child = object.public_send(name)
      child_label(name)
      visit_child(child)
    end
Visit a child by name

 @param [Symbol] name
   the attribute name of the child to visit

 @return [undefined]

 @api private