Method update_repo_topic

backend/src/git/topic.rs:660–685

(
        &self,
        mutation: Mutation,
        store: &S,
        name: String,
        topic_id: &ExternalId,
        parent: RepoTopic,
        matches: BTreeSet<SynonymMatch>,
    )

    }

    fn update_repo_topic<S>(
        &self,
        mutation: Mutation,
        store: &S,
        name: String,
        topic_id: &ExternalId,
        parent: RepoTopic,
        matches: BTreeSet<SynonymMatch>,
    ) -> Result<UpsertTopicResult>
    where
        S: SaveChangesForPrefix,
    {
        let date = chrono::Utc::now();

        if mutation.cycle_exists(self.repo_id, topic_id, parent.topic_id())? {
            return self.handle_cycle(mutation, topic_id, parent, matches);
        }

        log::info!("updating existing topic {:?}", topic_id);
        let mut topic = self.ensure_topic(&mutation, topic_id);
        let parent_topics = topic.parent_topics.clone();

        topic.parent_topics.insert(parent.to_parent_topic());
        topic = append_synonym(topic, &name, self.locale, date);
        self.persist_repo_topic(mutation, store, topic, parent, parent_topics)
    }

    fn handle_cycle(
        &self,