'Formats the self.filtered_data in a way suitable for a formset.'

def _get_formset_data(self):

    data = []
    for datum in self.filtered_data:
        form_data = {}
        for column in self.columns.values():
            value = column.get_data(datum)
            form_data[column.name] = value
        form_data['id'] = self.get_object_id(datum)
        data.append(form_data)
    return data
