Rails how to create recursive nested_form_for for child-parent relations

Model is

class MenuItem < ActiveRecord::Base
  belongs_to :menu_item
  has_many :menu_items
  accepts_nested_attributes_for :menu_items
end

How to create a form with ability to add dynamically children and also children of children if needed (preferably with nested_form_for). In other words form shall be something like:

input
  child input
    child input (child of child)
    add/remove child (child of child of child)
  add/remove child (child)
add/remove input

Clicking add/remove will add/remove one more according child, how can I achieve this?