code: def generate_template_arc_tree(self):
          '''
          Generate a seven point template in this arc. Arc must be empty.
          '''
          arc_root = self.arc_root_node
          if not arc_root:
              arc_root = ArcElementNode.add_root(
                  arc_element_type='root',
                  description='root of arc %s' % self.name,
                  arc=self
              )
          if arc_root.get_children():
              raise ArcIntegrityError(_("This arc already has elements. You cannot build a template on top of it"))
          for key, value in ARC_NODE_ELEMENT_DEFINITIONS.items():
              if value['milestone']:
                  arc_root.add_child(arc_element_type=key, description=value['template_description'])
                  arc_root.refresh_from_db()
          return ArcElementNode.objects.get(pk=arc_root.pk).get_children().count(f generate_template_arc_tree(self):
          '''
          Generate a seven point template in this arc. Arc must be empty.
          '''
          arc_root = self.arc_root_node
          if not arc_root:
              arc_root = ArcElementNode.add_root(
                  arc_element_type='root',
                  description='root of arc %s' % self.name,
                  arc=self
              )
          if arc_root.get_children():
              raise ArcIntegrityError(_("This arc already has elements. You cannot build a template on top of it"))
          for key, value in ARC_NODE_ELEMENT_DEFINITIONS.items():
              if value['milestone']:
                  arc_root.add_child(arc_element_type=key, description=value['template_description'])
                  arc_root.refresh_from_db()
          return ArcElementNode.objects.get(pk=arc_root.pk).get_children().count()
docs: Generate a seven point template in this arc. Arc must be empty.