filtering items by traits

front-api/controllers/common_for_controllers.rb

@@ -1,5 +1,9 @@
+# converts querystring to hash
+def get_querystring_hash()
+   Rack::Utils.parse_nested_query(request.query_string)
+end
 
 # converts list of parameters to array of integers
 def mass_to_i(*id_strings)
   id_strings.map(&:to_i)
-end
+end