def update(self, doc, process=None):
        if process is None:
            pk = 'id'
            id = doc.id
            doc.synced = False
            set = doc
        elif process == UPDATE_PROCESS:
            if self.db.docs.find({'sid': doc.sid}).count() == 0:
                return self.insert(doc, synced=True)
            pk = 'sid'
            id = doc.sid
            doc.synced = not doc.merged() # must be commited if was merged
            doc.merged(False)
            set = {'tid': doc.tid, 'data': doc.data, 'user': doc.user,
                   'public': doc.public, 'synced': doc.synced}
        elif process == COMMIT_PROCESS:
            pk = 'id'
            id = doc.id
            doc.synced = True
            set = {'sid': doc.sid, 'tid': doc.tid, 'synced': doc.synced}
        else:
            raise DatabaseException('Incorrect update process')

        try:
            rs = self.db.docs.update({pk: id}, {'$set': set}, safe=True)
            assert rs['n'] == 1
        except Exception as e:
            raise DatabaseException(e)
        return doc
def prepare_request(next_link=None):
            # Construct headers
            header_parameters = {}  # type: Dict[str, Any]
            header_parameters['Accept'] = self._serialize.header("accept", accept, 'str')

            if not next_link:
                # Construct URL
                url = self.list_query_results_for_management_group.metadata['url']  # type: ignore
                path_format_arguments = {
                    'managementGroupsNamespace': self._serialize.url("management_groups_namespace", management_groups_namespace, 'str'),
                    'managementGroupName': self._serialize.url("management_group_name", management_group_name, 'str'),
                    'policyTrackedResourcesResource': self._serialize.url("policy_tracked_resources_resource", policy_tracked_resources_resource, 'str'),
                }
                url = self._client.format_url(url, **path_format_arguments)
                # Construct parameters
                query_parameters = {}  # type: Dict[str, Any]
                if _top is not None:
                    query_parameters['$top'] = self._serialize.query("top", _top, 'int', minimum=0)
                if _filter is not None:
                    query_parameters['$filter'] = self._serialize.query("filter", _filter, 'str')
                query_parameters['api-version'] = self._serialize.query("api_version", api_version, 'str')

                request = self._client.post(url, query_parameters, header_parameters)
            else:
                url = next_link
                query_parameters = {}  # type: Dict[str, Any]
                request = self._client.get(url, query_parameters, header_parameters)
            return request