Major - P3 Our spec tests for findAndModify accidentally send "returnDocument" as a command argument which is causing latest (v4.1.10-294-g59a22d074e) to fail. The server must have recently implemented stricter command parsing for findAndModify:
ERROR [0.030s]: test_write_findOneAndReplace_FindOneAndReplace_when_many_documents_match_returning_the_document_after_modification (test_crud_v1.TestAllScenarios) ERROR [0.047s]: test_write_findOneAndReplace_FindOneAndReplace_when_no_documents_match_returning_the_document_after_modification (test_crud_v1.TestAllScenarios) ERROR [0.027s]: test_write_findOneAndReplace_FindOneAndReplace_when_one_document_matches_returning_the_document_after_modification (test_crud_v1.TestAllScenarios) ERROR [0.025s]: test_write_findOneAndReplace_collation_FindOneAndReplace_when_one_document_matches_with_collation_returning_the_document_after_modification (test_crud_v1.TestAllScenarios) ERROR [0.024s]: test_write_findOneAndReplace_upsert_FindOneAndReplace_when_no_documents_match_with_id_specified_with_upsert_returning_the_document_after_modification (test_crud_v1.TestAllScenarios) ERROR [0.028s]: test_write_findOneAndReplace_upsert_FindOneAndReplace_when_no_documents_match_without_id_specified_with_upsert_returning_the_document_after_modification (test_crud_v1.TestAllScenarios) ERROR [0.026s]: test_write_findOneAndUpdate_FindOneAndUpdate_when_many_documents_match_returning_the_document_after_modification (test_crud_v1.TestAllScenarios) ERROR [0.028s]: test_write_findOneAndUpdate_FindOneAndUpdate_when_no_documents_match_returning_the_document_after_modification (test_crud_v1.TestAllScenarios) ERROR [0.025s]: test_write_findOneAndUpdate_FindOneAndUpdate_when_no_documents_match_with_upsert_returning_the_document_after_modification (test_crud_v1.TestAllScenarios) ERROR [0.033s]: test_write_findOneAndUpdate_FindOneAndUpdate_when_one_document_matches_returning_the_document_after_modification (test_crud_v1.TestAllScenarios) ERROR [0.056s]: test_transactions_findOneAndReplace_collection_writeConcern_ignored_for_findOneAndReplace (test_transactions.TestTransactions) ERROR [0.055s]: test_transactions_findOneAndReplace_findOneAndReplace (test_transactions.TestTransactions) ERROR [0.060s]: test_transactions_findOneAndUpdate_collection_writeConcern_ignored_for_findOneAndUpdate (test_transactions.TestTransactions) ERROR [0.060s]: test_transactions_findOneAndUpdate_findOneAndUpdate (test_transactions.TestTransactions) ERROR [0.061s]: test_transactions_write_concern_unacknowledged_write_concern_coll_findOneAndReplace (test_transactions.TestTransactions) ERROR [0.052s]: test_transactions_write_concern_unacknowledged_write_concern_coll_findOneAndUpdate (test_transactions.TestTransactions)
A full stack trace looks like this:
ERROR [0.030s]: test_write_findOneAndReplace_FindOneAndReplace_when_many_documents_match_returning_the_document_after_modification (test_crud_v1.TestAllScenarios) ---------------------------------------------------------------------- Traceback (most recent call last): File "/data/mci/9dc8d2c277205833c62a2d47c44285a0/src/test/__init__.py", line 410, in wrap return f(*args, **kwargs) File "/data/mci/9dc8d2c277205833c62a2d47c44285a0/src/test/test_crud_v1.py", line 159, in run_scenario result = run_operation(self.db.test, test) File "/data/mci/9dc8d2c277205833c62a2d47c44285a0/src/test/test_crud_v1.py", line 129, in run_operation result = cmd(**arguments) File "/data/mci/9dc8d2c277205833c62a2d47c44285a0/src/pymongo/collection.py", line 3052, in find_one_and_replace session=session, **kwargs) File "/data/mci/9dc8d2c277205833c62a2d47c44285a0/src/pymongo/collection.py", line 2915, in __find_and_modify write_concern.acknowledged, _find_and_modify, session) File "/data/mci/9dc8d2c277205833c62a2d47c44285a0/src/pymongo/mongo_client.py", line 1463, in _retryable_write return self._retry_with_session(retryable, func, s, None) File "/data/mci/9dc8d2c277205833c62a2d47c44285a0/src/pymongo/mongo_client.py", line 1364, in _retry_with_session return func(session, sock_info, retryable) File "/data/mci/9dc8d2c277205833c62a2d47c44285a0/src/pymongo/collection.py", line 2909, in _find_and_modify user_fields=_FIND_AND_MODIFY_DOC_FIELDS) File "/data/mci/9dc8d2c277205833c62a2d47c44285a0/src/pymongo/collection.py", line 247, in _command user_fields=user_fields) File "/data/mci/9dc8d2c277205833c62a2d47c44285a0/src/pymongo/pool.py", line 584, in command user_fields=user_fields) File "/data/mci/9dc8d2c277205833c62a2d47c44285a0/src/pymongo/network.py", line 158, in command parse_write_concern_error=parse_write_concern_error) File "/data/mci/9dc8d2c277205833c62a2d47c44285a0/src/pymongo/helpers.py", line 155, in _check_command_response raise OperationFailure(msg % errmsg, code, response) OperationFailure: BSON field 'returnDocument' is an unknown field.