FIX: Reduce scope of topic gists inclusion.

The topic query is used differently, and we can't assume the modifier will always receive an AR relation. Let's scope it to `Discourse#filters` instead of most lists.

Author: romanrizzi

lib/summarization/entry_point.rb

@@ -18,11 +18,11 @@ def inject_into(plugin)
         end
 
         plugin.register_modifier(:topic_query_create_list_topics) do |topics, options|
-          skipped_filters = %i[suggested semantic_related private_messages]
-
-          if !skipped_filters.include?(options[:filter]) && SiteSetting.ai_summarization_enabled &&
+          if Discourse.filters.include?(options[:filter]) && SiteSetting.ai_summarization_enabled &&
                SiteSetting.ai_summarize_max_hot_topics_gists_per_batch > 0
-            topics.includes(:ai_summaries).where(
+            topics.joins(
+              "LEFT OUTER JOIN ai_summaries ON topics.id = ai_summaries.target_id AND ai_summaries.target_type = 'Topic'",
+            ).where(
               "ai_summaries.id IS NULL OR ai_summaries.summary_type = ?",
               AiSummary.summary_types[:gist],
             )
@@ -36,7 +36,7 @@ def inject_into(plugin)
           :ai_topic_gist,
           include_condition: -> { scope.can_see_gists? },
         ) do
-          return if %i[suggested semantic_related private_messages].include?(options[:filter])
+          return if !Discourse.filters.include?(options[:filter])
           summaries = object.ai_summaries.to_a
 
           # Summaries should always have one or zero elements here.