code: def get_many_to_many_lines(self, force=False):
          
  
          lines = []
  
          for field, rel_items in self.many_to_many_waiting_list.items():
              for rel_item in list(rel_items):
                  try:
                      pk_name = rel_item._meta.pk.name
                      key = '%s_%s' % (rel_item.__class__.__name__, getattr(rel_item, pk_name))
                      value = "%s" % self.context[key]
                      lines.append('%s.%s.add(%s)' % (self.variable_name, field.name, value))
                      self.many_to_many_waiting_list[field].remove(rel_item)
                  except KeyError:
                      if force:
                          item_locator = orm_item_locator(rel_item)
                          self.context["__extra_imports"][rel_item._meta.object_name] = rel_item.__module__
                          lines.append('%s.%s.add( %s )' % (self.variable_name, field.name, item_locator))
                          self.many_to_many_waiting_list[field].remove(rel_item)
  
          if lines:
              lines.append("")
  
          return lines
docs: Generate lines that define many to many relations for this instance.