The Rails JSON encoder API requires as_json to take an optional arg

lib/search/grouped_search_results.rb

@@ -15,7 +15,7 @@ class Search
       return topic_results.result_ids
     end
 
-    def as_json
+    def as_json(options = nil)
       @by_type.values.map do |grouped_result|
         grouped_result.as_json
       end

lib/search/search_result.rb

@@ -15,7 +15,7 @@ class Search
       @url, @id, @title = row[:url], row[:id], row[:title]
     end
 
-    def as_json
+    def as_json(options = nil)
       json = {id: @id, title: @title, url: @url}
       json[:avatar_template] = @avatar_template if @avatar_template.present?
       json[:color] = @color if @color.present?

lib/search/search_result_type.rb

@@ -20,7 +20,7 @@ class Search
       @result_ids << result.id
     end
 
-    def as_json
+    def as_json(options = nil)
       { type: @type.to_s,
         name: I18n.t("search.types.#{@type.to_s}"),
         more: @more,