FIX: Shared draft performance fix + missing avatars

app/controllers/list_controller.rb

@@ -71,7 +71,15 @@ class ListController < ApplicationController
 
       list = TopicQuery.new(user, list_opts).public_send("list_#{filter}")
 
-      if @category.present? && guardian.can_create_shared_draft?
+      if guardian.can_create_shared_draft? && @category.present?
+        if @category.id == SiteSetting.shared_drafts_category.to_i
+          # On shared drafts, show the destination category
+          list.topics.each do |t|
+            t.includes_destination_category = true
+          end
+        else
+          # When viewing a non-shared draft category, find topics whose
+          # destination are this category
           shared_drafts = TopicQuery.new(
             user,
             category: SiteSetting.shared_drafts_category,
@@ -82,6 +90,7 @@ class ListController < ApplicationController
             list.shared_drafts = shared_drafts.topics
           end
         end
+      end
 
       list.more_topics_url = construct_url_with(:next, list_opts)
       list.prev_topics_url = construct_url_with(:prev, list_opts)

app/models/topic.rb

@@ -31,7 +31,7 @@ class Topic < ActiveRecord::Base
   def_delegator :notifier, :mute!, :notify_muted!
   def_delegator :notifier, :toggle_mute, :toggle_mute
 
-  attr_accessor :allowed_user_ids, :tags_changed
+  attr_accessor :allowed_user_ids, :tags_changed, :includes_destination_category
 
   DiscourseEvent.on(:site_setting_saved) do |site_setting|
     if site_setting.name.to_s == "slug_generation_method" && site_setting.saved_change_to_value?

app/models/topic_list.rb

@@ -26,7 +26,8 @@ class TopicList
     end
   end
 
-  attr_accessor :more_topics_url,
+  attr_accessor(
+    :more_topics_url,
     :prev_topics_url,
     :draft,
     :draft_key,
@@ -37,7 +38,9 @@ class TopicList
     :top_tags,
     :current_user,
     :tags,
-                :shared_drafts
+    :shared_drafts,
+    :category
+  )
 
   def initialize(filter, current_user, topics, opts = nil)
     @filter = filter

app/serializers/topic_list_item_serializer.rb

@@ -30,8 +30,9 @@ class TopicListItemSerializer < ListableTopicSerializer
   end
 
   def category_id
+
     # If it's a shared draft, show the destination topic instead
-    if object.category_id == SiteSetting.shared_drafts_category.to_i && object.shared_draft
+    if object.includes_destination_category && object.shared_draft
       return object.shared_draft.category_id
     end
 

lib/topic_query.rb

@@ -482,17 +482,19 @@ class TopicQuery
     end
 
     def apply_shared_drafts(result, category_id, options)
-      viewing_shared = category_id && category_id == SiteSetting.shared_drafts_category.to_i
+      drafts_category_id = SiteSetting.shared_drafts_category.to_i
+      viewing_shared = category_id && category_id == drafts_category_id
 
       if guardian.can_create_shared_draft?
-        result = result.includes(:shared_draft).references(:shared_draft)
-
         if options[:destination_category_id]
           destination_category_id = get_category_id(options[:destination_category_id])
-          return result.where("shared_drafts.category_id" => destination_category_id)
+          topic_ids = SharedDraft.where(category_id: destination_category_id).pluck(:topic_id)
+          return result.where(id: topic_ids)
+        elsif viewing_shared
+          result = result.includes(:shared_draft).references(:shared_draft)
+        else
+          return result.where('topics.category_id != ?', drafts_category_id)
         end
-
-        return result.where("shared_drafts.id IS NULL") unless viewing_shared
       end
 
       result