This commit splits out the updating of `TopicUser#last_read_post_number` in
`TopicUser.ensure_consistency!` to a new
`TopicUser.update_last_read_post_number` method` which
`PostTiming.pretend_read` will now call instead. Previously,
`PostTiming.pretend_read` calls `TopicUser.ensure_consistency!` which in
turn calls `TopicUser.update_post_action_cache` but that is
unnecessary for `PostTiming.pretend_read` since `PostTiming.pretend_read` does not
affect the `TopicUser#liked` or `TopicUser.bookmarked` columns which
`TopicUser.update_post_action_cache` updates. As the query in
`TopicUser.update_post_action_cache` can be expensive, we should avoid
calling it when it isn't necessary.
One such scenario where it is unnecessary is when we are closing a
topic.
This ensures we only ever store correct post and topic timing when the client
notifies.
Previous to this change we would blindly trust the client.
Additionally this has error correction code that will correct the last seen
post number when you visit a topic with incorrect timings.
This change creates a user setting that they can toggle if
they don't want to receive unread notifications when someone closes a
topic they have read and are watching/tracking it.
Before, whispers were only available for staff members.
Config has been changed to allow to configure privileged groups with access to whispers. Post migration was added to move from the old setting into the new one.
I considered having a boolean column `whisperer` on user model similar to `admin/moderator` for performance reason. Finally, I decided to keep looking for groups as queries are only done for current user and didn't notice any N+1 queries.
Some users somehow manage to keep a topic open for a very long time that it causes the post read time to exceed the max integer value (2^31 - 1) which causes errors when we try to update the read time in the database to values above the integer limit.
This PR will cap posts read time at 2^31 - 1 to prevent these errors.
Zeitwerk simplifies working with dependencies in dev and makes it easier reloading class chains.
We no longer need to use Rails "require_dependency" anywhere and instead can just use standard
Ruby patterns to require files.
This is a far reaching change and we expect some followups here.
* Revert "Revert "FEATURE: Publish read state on group messages. (#7989) [Undo revert] (#8024)""
This reverts commit 36425eb9f0.
* Fix: Show who read only if the attribute is enabled
* PERF: Precalculate the last post readed by a group member
* Use book-reader icon instear of far-eye
* FIX: update topic groups correctly
* DEV: Tidy up read indicator update on write
On busy sites, concurrent requests to insert into post_timings can
occur, which was dealt with using Ruby exceptions.
This moves the handling to PostgreSQL which makes it a bit faster,
and prevents a spam of ERROR in the database logs.
This optimisation avoids large scans joining the topics table with the
topic_users table.
Previously when a user carried a lot of read state we would have to join
the entire read state with the topics table. This operation would slow down
home page and every topic page. The more read state you accumulated the
larger the impact.
The optimisation helps people who clean up unread, however if you carry
unread from years ago it will only have minimal impact.
Introduce new patterns for direct sql that are safe and fast.
MiniSql is not prone to memory bloat that can happen with direct PG usage.
It also has an extremely fast materializer and very a convenient API
- DB.exec(sql, *params) => runs sql returns row count
- DB.query(sql, *params) => runs sql returns usable objects (not a hash)
- DB.query_hash(sql, *params) => runs sql returns an array of hashes
- DB.query_single(sql, *params) => runs sql and returns a flat one dimensional array
- DB.build(sql) => returns a sql builder
See more at: https://github.com/discourse/mini_sql
