diff --git a/app/controllers/search_controller.rb b/app/controllers/search_controller.rb
index 56771cc..d31861d 100644
--- a/app/controllers/search_controller.rb
+++ b/app/controllers/search_controller.rb
@@ -10,7 +10,9 @@ class SearchController < ApplicationController
     @search_definition = PaperSearch.new(query: params[:q],
                                          paper_type: params[:paper_type],
                                          originator: params[:originator],
-                                         sort_by: params[:sort_by])
+                                         sort_by: params[:paper_search][:sort_by])
+
+   # @search = PaperSearch.new params[:paper_search]
 
     @response = Paper.search(@search_definition)
     @papers = @response.page(params[:page]).results
diff --git a/app/views/search/_form.slim b/app/views/search/_form.slim
index 6756ea9..34c0f49 100644
--- a/app/views/search/_form.slim
+++ b/app/views/search/_form.slim
@@ -1,4 +1,4 @@
-= form_tag(search_path, method: :get)
+= form_for(@search_definition, url: search_path, method: :get) do |f|
   = text_field_tag(:q, @search_definition.query, placeholder: 'Suche…', autofocus: true)
   fieldset
     legend Ergebnisse filtern
@@ -9,7 +9,7 @@
         = filter_select("originator", "Einreicher", @originator_facets, @search_definition.originator)
       .small-4.columns.end
         label Sortierung
-        input type="radio" name="sort_by" value="date" id="sort_by_date"
+        = f.radio_button :sort_by, :date
         label for="sort_by_date" Nach Datum
-        input type="radio" name="sort_by" value="score" id="sort_by_score"
+        = f.radio_button :sort_by, :score
         label for="sort_by_score" Nach Relevanz