Improve search results by introducing an aggregate post search data

filter. It seems performant despite the extra content being searched.

lib/search.rb

@@ -206,7 +206,8 @@ class Search
       end
     end
 
-    def posts_query(limit)
+    def posts_query(limit, opts=nil)
+      opts ||= {}
       posts = Post.includes(:post_search_data, {:topic => :category})
                   .where("topics.deleted_at" => nil)
                   .where("topics.visible")
@@ -234,8 +235,14 @@ class Search
       end
 
       posts = posts.order("TS_RANK_CD(TO_TSVECTOR(#{query_locale}, topics.title), #{ts_query}) DESC")
-                   .order("TS_RANK_CD(post_search_data.search_data, #{ts_query}) DESC")
-                   .order("topics.bumped_at DESC")
+
+      data_ranking = "TS_RANK_CD(post_search_data.search_data, #{ts_query})"
+      if opts[:aggregate_search]
+        posts = posts.order("SUM(#{data_ranking}) DESC")
+      else
+        posts = posts.order("#{data_ranking} DESC")
+      end
+      posts = posts.order("topics.bumped_at DESC")
 
       if secure_category_ids.present?
         posts = posts.where("(categories.id IS NULL) OR (NOT categories.read_restricted) OR (categories.id IN (?))", secure_category_ids).references(:categories)
@@ -270,6 +277,18 @@ class Search
       end
     end
 
+    def aggregate_search
+      cols = ['topics.id', 'topics.title', 'topics.slug']
+      topics = posts_query(@limit, aggregate_search: true).group(*cols).pluck(*cols)
+      topics.each do |t|
+        @results.add_result(SearchResult.new(type: :topic,
+                                             topic_id: t[0],
+                                             id: t[0],
+                                             title: t[1],
+                                             url: "/t/#{t[2]}/#{t[0]}"))
+      end
+    end
+
     def topic_search
 
       posts = if @search_context.is_a?(User)
@@ -277,10 +296,12 @@ class Search
                 posts_query(@limit * Search.burst_factor)
               elsif @search_context.is_a?(Topic)
                 posts_query(@limit).where('posts.post_number = 1 OR posts.topic_id = ?', @search_context.id)
-              else
-                posts_query(@limit).where(post_number: 1)
+              elsif @include_blurbs
+                posts_query(@limit).where('posts.post_number = 1')
               end
 
+      # If no context, do an aggregate search
+      return aggregate_search if posts.nil?
 
       posts.each do |p|
         @results.add_result(SearchResult.from_post(p, @search_context, @term, @include_blurbs))

lib/search/search_result_type.rb

@@ -28,4 +28,4 @@ class Search
     end
   end
 
-end
+end

spec/components/search_spec.rb

@@ -195,7 +195,9 @@ describe Search do
       it 'returns the post' do
         result.should be_present
         result[:title].should == topic.title
-        result[:url].should == reply.url
+
+        # The link is to the topic url because it's aggregated
+        result[:url].should == topic.relative_url
       end
     end