'Internal helper for inserting a single document.'

def _insert_one(self, sock_info, doc, ordered, check_keys, manipulate, write_concern, op_id, bypass_doc_val):

    if manipulate:
        doc = self.__database._apply_incoming_manipulators(doc, self)
        if ((not isinstance(doc, RawBSONDocument)) and ('_id' not in doc)):
            doc['_id'] = ObjectId()
        doc = self.__database._apply_incoming_copying_manipulators(doc, self)
    concern = (write_concern or self.write_concern).document
    acknowledged = (concern.get('w') != 0)
    command = SON([('insert', self.name), ('ordered', ordered), ('documents', [doc])])
    if concern:
        command['writeConcern'] = concern
    if ((sock_info.max_wire_version > 1) and acknowledged):
        if (bypass_doc_val and (sock_info.max_wire_version >= 4)):
            command['bypassDocumentValidation'] = True
        result = sock_info.command(self.__database.name, command, codec_options=self.__write_response_codec_options, check_keys=check_keys)
        _check_write_command_response([(0, result)])
    else:
        self._legacy_write(sock_info, 'insert', command, acknowledged, op_id, bypass_doc_val, message.insert, self.__full_name, [doc], check_keys, acknowledged, concern, False, self.__write_response_codec_options)
    if (not isinstance(doc, RawBSONDocument)):
        return doc.get('_id')
