def add_many_rows(self, user, data):
        """
        Shortcut for adding rows in bulk. 

        ``data`` must be an array of tuples in the format (data_array, external_id)
        """
        self.lock()

        try:
            data_typer = DataTyper(self.column_schema)

            solr_rows = [utils.solr.make_data_row(self, d[0], external_id=d[1]) for d in data]
            solr_rows = [data_typer(s, d[0]) for s, d in zip(solr_rows, data)]

            solr.add(settings.SOLR_DATA_CORE, solr_rows, commit=True)
            
            self.schema = data_typer.schema

            if not self.sample_data:
                self.sample_data = []
            
            if len(self.sample_data) < 5:
                needed = 5 - len(self.sample_data)
                self.sample_data.extend([d[0] for d in data[:needed]])

            old_row_count = self.row_count
            self.row_count = self._count_rows()
            added = self.row_count + (old_row_count or 0)
            updated = len(data) - added
            self.last_modified = now()
            self.last_modified_by = user

            if added and updated: 
                self.last_modification = _('%(added)i rows added and %(updated)i updated') \
                    % {'added': added, 'updated': updated}
            elif added:
                self.last_modification = _('%i rows added') % added
            else:
                self.last_modification = _('%i rows updated') % updated

            self.save()

            return solr_rows
        finally:
            self.unlock()
dataset/ETHPy150Open pandaproject/panda/panda/models/dataset.py/Dataset.add_many_rows/operator `-` -> `+`