Composite pattern ruby

Class ItemsGroup could be called Composite in current example.

class Component
  attr_reader :data
  
  def initialize(data)
    @data = data
  end
  
  def display
    raise "Implement me"
  end
end

class ItemsGroup < Component
  def initialize
    @children = []
  end
  
  def add_child(child)
    @children << child
  end
  
  def remove_child(child)
    @children.delete(child)
  end
  
  def display
    @children.each do |child|
      child.display
    end
  end
end

class Item < Component
  def display
    puts data.inspect
  end
end

group = ItemsGroup.new
group1 = ItemsGroup.new
group2 = ItemsGroup.new

group1.add_child(Item.new('label'))
group1.add_child(Item.new('input text'))
group2.add_child(Item.new('label'))
group2.add_child(Item.new('input password'))

group.add_child(Item.new("header"))
group.add_child(group1)
group.add_child(group2)
group.add_child(Item.new("submit button"))

group.display