#NEWLINE# def _create_tree_space( self , target_tree_id , num_trees = 1 ) : #NEWLINE# #INDENT# '\n        Creates space for a new tree by incrementing all tree ids\n        greater than ``target_tree_id``.\n        ' #NEWLINE# qs = self . _mptt_filter ( tree_id__gt = target_tree_id ) #NEWLINE# self . _mptt_update ( qs , tree_id = ( F ( self . tree_id_attr ) + num_trees ) ) #NEWLINE# self . tree_model . _mptt_track_tree_insertions ( ( target_tree_id + 1 ) , num_trees )