FEATURE: digests choose topics you're watching or tracking first

app/models/topic.rb

@@ -362,7 +362,7 @@ class Topic < ActiveRecord::Base
       topics = topics.where("topics.category_id NOT IN (?)", muted_category_ids)
     end
 
-    # Remove muted categories
+    # Remove muted tags
     muted_tag_ids = TagUser.lookup(user, :muted).pluck(:tag_id)
     unless muted_tag_ids.empty?
       topics = topics.joins("LEFT OUTER JOIN topic_tags ON topic_tags.topic_id = topics.id")

lib/topic_query_sql.rb

@@ -52,7 +52,7 @@ module TopicQuerySQL
     end
 
     def order_top_with_notification_levels(score)
-      "COALESCE(category_users.notification_level, 1) DESC, COALESCE(top_topics.#{score}, 0) DESC, topics.bumped_at DESC"
+      "COALESCE(topic_users.notification_level, 1) DESC, COALESCE(category_users.notification_level, 1) DESC, COALESCE(top_topics.#{score}, 0) DESC, topics.bumped_at DESC"
     end
 
   end

spec/models/topic_spec.rb

@@ -1392,6 +1392,16 @@ describe Topic do
       expect(for_digest.first).to eq(topic1)
     end
 
+    it "sorts by topic notification levels" do
+      topics = []
+      3.times {|i| topics << Fabricate(:topic) }
+      user = Fabricate(:user)
+      TopicUser.create(user_id: user.id, topic_id: topics[0].id, notification_level: TopicUser.notification_levels[:tracking])
+      TopicUser.create(user_id: user.id, topic_id: topics[2].id, notification_level: TopicUser.notification_levels[:watching])
+      for_digest = Topic.for_digest(user, 1.year.ago, top_order: true).pluck(:id)
+      expect(for_digest).to eq([topics[2].id, topics[0].id, topics[1].id])
+    end
+
   end
 
   describe 'secured' do