FEATURE: better notification level on assign

Use the "when I post in a topic, set that topic to..." user preference as the default notification level when a topic/post is assigned to a user instead of always setting it to "watching".

lib/assigner.rb

@@ -312,15 +312,15 @@ class ::Assigner
     publish_assignment(assignment, assign_to, note, status)
 
     if assignment.assigned_to_user?
-      if !TopicUser.exists?(
-           user_id: assign_to.id,
-           topic_id: topic.id,
-           notification_level: TopicUser.notification_levels[:watching],
-         )
+      notification_level =
+        assign_to.user_option&.notification_level_when_replying ||
+          TopicUser.notification_levels[:watching]
+
+      if !TopicUser.exists?(user_id: assign_to.id, topic_id: topic.id, notification_level:)
         TopicUser.change(
           assign_to.id,
           topic.id,
-          notification_level: TopicUser.notification_levels[:watching],
+          notification_level:,
           notifications_reason_id: TopicUser.notification_reasons[:plugin_changed],
         )
       end

spec/lib/assigner_spec.rb

@@ -30,14 +30,34 @@ RSpec.describe Assigner do
         [topic],
       )
 
-      expect(TopicUser.find_by(user: moderator).notification_level).to eq(
-        TopicUser.notification_levels[:watching],
-      )
+      notification_level = moderator.user_option.notification_level_when_replying
+
+      expect(TopicUser.find_by(user: moderator).notification_level).to eq(notification_level)
 
       expect_enqueued_with(job: :unassign_notification) { assigner.unassign }
 
       expect(TopicQuery.new(moderator, assigned: moderator.username).list_latest.topics).to eq([])
 
+      expect(TopicUser.find_by(user: moderator).notification_level).to eq(notification_level)
+    end
+
+    it "uses the notification_level_when_replying of the assignee" do
+      moderator.user_option.update!(
+        notification_level_when_replying: TopicUser.notification_levels[:regular],
+      )
+
+      assigner.assign(moderator)
+
+      expect(TopicUser.find_by(user: moderator).notification_level).to eq(
+        TopicUser.notification_levels[:regular],
+      )
+    end
+
+    it "defaults the notification level to watching" do
+      moderator.user_option.update!(notification_level_when_replying: nil)
+
+      assigner.assign(moderator)
+
       expect(TopicUser.find_by(user: moderator).notification_level).to eq(
         TopicUser.notification_levels[:watching],
       )
@@ -111,11 +131,9 @@ RSpec.describe Assigner do
     end
 
     it "does not update notification level if already watching" do
-      TopicUser.change(
-        moderator.id,
-        topic.id,
-        notification_level: TopicUser.notification_levels[:watching],
-      )
+      notification_level = moderator.user_option.notification_level_when_replying
+
+      TopicUser.change(moderator.id, topic.id, notification_level:)
 
       expect do assigner_self.assign(moderator) end.to_not change {
         TopicUser.last.notifications_reason_id
@@ -123,16 +141,16 @@ RSpec.describe Assigner do
     end
 
     it "does not update notification level when unassigned" do
+      notification_level = moderator.user_option.notification_level_when_replying
+
       assigner.assign(moderator)
 
-      expect(TopicUser.find_by(user: moderator).notification_level).to eq(
-        TopicUser.notification_levels[:watching],
-      )
+      expect(TopicUser.find_by(user: moderator).notification_level).to eq(notification_level)
 
       assigner.unassign
 
       expect(TopicUser.find_by(user: moderator, topic: topic).notification_level).to eq(
-        TopicUser.notification_levels[:watching],
+        notification_level,
       )
     end