Method call

backend/src/git/link.rs:27–62

(&self, mut mutation: Mutation, store: &S)

impl DeleteLink {
    pub fn call<S>(&self, mut mutation: Mutation, store: &S) -> Result<DeleteLinkResult>
    where
        S: SaveChangesForPrefix,
    {
        let link = mutation.fetch_link(self.repo_id, &self.link_id);
        if link.is_none() {
            return Err(Error::NotFound(format!("not found: {}", self.link_id)));
        }
        let link = link.unwrap();

        // Not actually used
        let date = chrono::Utc::now();
        let child = link.to_topic_child(date);
        let mut parent_topics = vec![];

        mutation.mark_deleted(self.repo_id, &self.link_id)?;

        for ParentTopic { id: parent_id, .. } in &link.parent_topics {
            if let Some(mut parent) = mutation.fetch_topic(self.repo_id, parent_id) {
                parent.children.remove(&child);
                mutation.save_topic(self.repo_id, &parent)?;
                parent_topics.push(parent);
            }
        }

        let change = self.change(&link, &parent_topics, date);

        mutation.remove_link(self.repo_id, &self.link_id, &link)?;
        mutation.add_change(self.repo_id, &change)?;
        mutation.write(store)?;

        Ok(DeleteLinkResult {
            alerts: vec![],
            deleted_link_id: self.link_id.clone(),
        })
    }

    fn change(
        &self,