def _load_mapping(self, mapping):
    'Load data for a single step.'
    mapping['oid_as_pk'] = bool(mapping.get('fields', {}).get('Id'))
    (job_id, local_ids_for_batch) = self._create_job(mapping)
    result = self._wait_for_job(job_id)
    self._store_inserted_ids(mapping, job_id, local_ids_for_batch)
    return result
Load data for a single step.
def _load_mapping(self, mapping):
    
    mapping['oid_as_pk'] = bool(mapping.get('fields', {}).get('Id'))
    (job_id, local_ids_for_batch) = self._create_job(mapping)
    result = self._wait_for_job(job_id)
    self._store_inserted_ids(mapping, job_id, local_ids_for_batch)
    return result