def copy_to_placeholder(self, placeholder, sort_order=None):
        qs = self.all()  # Get clone
        for item in qs:
            # Change the item directly in the resultset.
            item.copy_to_placeholder(placeholder, sort_order=sort_order, in_place=True)
            if sort_order is not None:
                sort_order += 1

        return qs
Count the number of rows currently stored in Solr for this Dataset.
dataset/ETHPy150Open edoburu/django-fluent-contents/fluent_contents/models/managers.py/ContentItemQuerySet.copy_to_placeholder--crossover with--dataset/ETHPy150Open pandaproject/panda/panda/models/dataset.py/Dataset._count_rows