def bulk_create(self, objs, *args, **kwargs):
        """Insert many object at once."""
        if hasattr(self.model, 'save_prep'):
            # Method from AbstractBaseModel. If the model class doesn't
            # subclass AbstractBaseModel, then don't call this.
            self.model.save_prep(instance_or_instances=objs)

        return super(CommonManager, self).bulk_create(objs=objs,
                                                      *args,
                                                      **kwargs)
Insert many object at once.