Clone tree

[pecha7x]

Hi, please any tip about as can clone all tree.
I try -
def clone_item(root, items)
childrens.each do |child|
new_child = child.dup
new_child.parent_id = root.id
new_child.save
clone_item(new_child, child.children) if child.has_children?
end
end

but a new tree incorrect.