Add assigners to filter summary

app/models/filter/summarized.rb

@@ -1,6 +1,6 @@
 module Filter::Summarized
   def summary
-    [ index_summary, tag_summary, assignee_summary, terms_summary ].compact.to_sentence + " #{bucket_summary}"
+    [ index_summary, tag_summary, assignee_summary, assigner_summary, terms_summary ].compact.to_sentence + " #{bucket_summary}"
   end
 
   def plain_summary
@@ -26,6 +26,12 @@ module Filter::Summarized
       end
     end
 
+    def assigner_summary
+      if assigners.any?
+        "assigned by <mark>#{assigners.pluck(:name).to_choice_sentence}</mark>"
+      end
+    end
+
     def bucket_summary
       if buckets.any?
         "in <mark>#{buckets.pluck(:name).to_choice_sentence}</mark>"