A while ago the `accept_all_solutions_allowed_groups` setting was introduced to replace the `accept_all_solutions_trust_level` setting and to make the plugin more flexible by allowing admins to choose groups that are allowed to accept solutions instead of trust levels.
The new group-based setting includes the TL4 group by default. However, removing the TL4 group from the setting doesn't actually remove TL4 users permission to accept solution.
The reason for this bug is that the `can_accept_answer?` guardian method calls `can_perform_action_available_to_group_moderators?` which always allows TL4 users to perform category moderator actions:
56524f4bdf/lib/guardian/topic_guardian.rb (L342-L348)
This commit fixes the bug by checking if the user is a moderator on the topic's category (by calling the `is_category_group_moderator?` guardian method) instead of checking if the user can perform category moderator actions. In our case, `is_category_group_moderator?` is equivalent to `can_perform_action_available_to_group_moderators?` except for the TL4 check which is what we need.
Internal topic: t/134675.
This refactor makes for easier testing and makes things
more organised, the guardian extensions had no testing
whatsoever and I need some to make the TL -> group change.
Osama Sayegh
Martin Brennan