class Haml::Buffer

def parse_object_ref(ref)

just like you can do with `dom_id()` and `dom_class()` in Rails
The second object, if present, is used as a prefix,
one to create an attributes hash.
Takes an array of objects and uses the class and id of the first 
def parse_object_ref(ref)
  prefix = ref[1]
  ref = ref[0]
  # Let's make sure the value isn't nil. If it is, return the default Hash.
  return {} if ref.nil?
  class_name = underscore(ref.class)
  id = "#{class_name}_#{ref.id || 'new'}"
  if prefix
    class_name = "#{ prefix }_#{ class_name}"
    id = "#{ prefix }_#{ id }"
  end
  {'id' => id, 'class' => class_name}
end