content: from mptt.managers import TreeManager as TreeManager_
  from mptt.querysets import TreeQuerySet as TreeQuerySet_
  
  from django.db.models import Manager
  from .querysets import RestrictedQuerySet
  
  __all__ = (
      'TreeManager',
      'TreeQuerySet',
  )
  
  
  class TreeQuerySet(TreeQuerySet_, RestrictedQuerySet):
      """
      Mate django-mptt's TreeQuerySet with our RestrictedQuerySet for permissions enforcement.
      """
      pass
  
  
  class TreeManager(Manager.from_queryset(TreeQuerySet), TreeManager_):
      """
      Extend django-mptt's TreeManager to incorporate RestrictedQuerySet().
      """
      pass
  