code: def as_tree(self, visitor=None, children=None):
          
          _parameters = {"node": self}
          if visitor is not None:
              _parameters["visitor"] = visitor
          if children is not None:
              _parameters["children"] = children
          return self.__class__.objects.node_as_tree(**_parameters)
docs: Recursively traverses each tree (starting from each root) in order
              to generate a dictionary-based tree structure of the entire forest.
              Each level of the forest/tree is a list of nodes, and each node
              consists of a dictionary representation, where the entry
              ``children`` (by default) consists of a list of dictionary
              representations of its children.
  
              See :meth:`CTENodeManager.as_tree` and
              :meth:`CTENodeManager.node_as_tree` for details on how this method
              works, as well as its expected arguments.
  
              :param visitor: optional function responsible for generating the
                  dictionary representation of a node.
  
              :param children: optional function responsible for generating a
                  children key and list for a node.
  
              :return: a dictionary representation of the structure of the forest.