recursive rails view helper that prints a tree

November 15th, 2006 •
tags: rails, rails helper, rails views

def display_tree_recursive(tree, parent_id)
  ret = "\n
”
  tree.each do |node|
    if node.parent_id == parent_id
      ret += “\n\t
”
      ret += yield node
      ret += display_tree_recursive(node.children, node.id) { |n| yield n } unless node.children.empty?
      ret += “\t

\n”
    end
  end
  ret += “

\n”
end

def print_path_to_node(node, separator)
  path = “”
  path += print_path_to_node(node.parent, separator) { |n| yield n } unless node.parent.nil?
  path += yield node
  path += separator unless node.children.empty?
  return path
end