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Paginate the whole activity feed

c8cdb6accc47af06a3df2b8b5023c21134fdb812 · Keenan Nemetz · 10d ago · parent 4d938fe8

Paginate the whole activity feed

Both activity pages stopped at a fixed number of events: the repository
feed was truncated at 100, and the instance feed merged 100 per
repository and then took 200 before its pager. Anything older was
unreachable.

Now that issues, changes, comments and state changes are index rows, the
whole feed is assembled from the database and paginated:

- the repository feed and the instance feed keep the whole sorted,
  filtered list, and both show 50 events per page;
- the repository feed gains a pager (it had none), and the instance
  pager now reaches all history;
- the kind/actor/assignee filters travel through the page links, so
  paging never widens the feed;
- the repository pager swaps the `#activity-feed` fragment over HTMX like
  the chips and the filter form, and the page links are plain hrefs when
  JavaScript is not there;
- the feed reads comment summaries (parent, id, author, created) rather
  than every comment body it will not render.

The home rail still asks for a bounded feed, so it keeps its handful of
events. The feed is assembled in memory per request, so a page costs
O(history) instead of O(page); that is the accepted trade for now, and a
SQL event stream is the follow-up if a large history makes it visible.

forge/index/detail.go −14

@@ -122,20 +122,6 @@ func (s Store) Request(repoID, id string) (metadata.Request, error) {
	122	122	return &req, nil
	123	123	}
	124	124
	125		// CommentsForRepo returns every comment of one kind in a repository, for a feed
	126		// that groups them by parent. It is the "all" form of Comments.
	127		func (s *Store) CommentsForRepo(repoID, kind string) ([]CommentRow, error) {
	128		rows, err := s.db.Query(
	129		`SELECT kind, parent, id, author, created, body, reply_to, deleted, path, side, line, blob
	130		FROM comments WHERE repo_id=? AND kind=? ORDER BY parent, id`,
	131		repoID, kind)
	132		if err != nil {
	133		return nil, err
	134		}
	135		defer rows.Close()
	136		return scanComments(rows)
	137		}
	138
	139	125	// AllApprovals returns every approval in a repository, keyed by request id. The
	140	126	// activity feed needs all of them; a list page asks for the rows it shows instead.
	141	127	func (s *Store) AllApprovals(repoID string) (map[string][]ApprovalRow, error) {