This change makes it possible to associate an assign notification with the `assignments` record that creates the notification. It'll be needed for the assignments tab in the new experimental user menu, see https://github.com/discourse/discourse/pull/17379.
Change `topic_id` to polymorphic approach (In the next step we will allow assigning to individual post)
`topic_id` column is still used for efficient display of assigned users on topic list (to avoid scanning posts)
Ability to assign groups.
To assign group, user must have a right to send a message to that group.
In addition, 2 jobs were introduced, - AssignNotification and UnassignNotification to inform interested users in the background about the new assignment.
* FIX: Skip enqueuing reminders if no groups are allowed.
With an empty SiteSetting.assign_allowed_on_groups, it used to generate
an invalid query containing "group_users.group_id IN ()".
* Feature: Allow assign on groups
* Use type: group_list option
* Track group changes and update the setting accordingly. Restrict reminders frequency to assign allowed users instead of staff
* FEATURE: Users can override reminders frequency
* Changes:
- Avoid creating a user custom field when the used didn't override the frequency
- Sanitize frequency value using coercion
- Minor fixes
* Sanitize query and user query single
* FEATURE: Remind users of assigned tasks.
* User an user custom field instead of adding a new column
* Improve tests. fix assigns count and display oldest assigned topics correctly. Do not remind about recently assigned tasks
Osama Sayegh
Rafael dos Santos Silva
Natalie Tay
Krzysztof Kotlarek
Martin Brennan
Bianca Nenciu
Jarek Radosz
Dan Ungureanu
Sam Saffron
Roman Rizzi
Guo Xiang Tan