Adds support for polymorphic bookmarks in the serializer extensions
and preloaders for bookmarks.
Specs are skipped for now for the serializer but they do
work without the use_polymorphic_bookmark guard in the plugin.rb
When topic is closed, we mark assignments as "inactive". Then when it is reopen and setting reassign_on_open is enabled, we bring back previous assignments.
We were already using custom fields for archive message and move to inbox. I changed custom fields solution to use active flag on Assignment model
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.
* 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
Martin Brennan
Natalie Tay
Isaac Janzen
Krzysztof Kotlarek
Jarek Radosz
Gerhard Schlager
Roman Rizzi
Guo Xiang Tan