a.diff

diff --git a/app/controllers/students_controller.rb b/app/controllers/students_controller.rb
index 7231f45..697d946 100644
--- a/app/controllers/students_controller.rb
+++ b/app/controllers/students_controller.rb
@@ -3,6 +3,7 @@ class StudentsController < ApplicationController
 
   before_filter :require_student_login, :only => %w[home profile update_profile support redirect_to_survey record_survey_result game]
   before_filter :require_teacher_login, :only => %w[index new create edit update, :atwork_index]
+  before_filter :find_survey_by_slug, only: [:redirect_to_survey]
   protect_from_forgery :except => :update_profile
 
   has_scope :fulltext,  :as => :term
@@ -315,4 +316,11 @@ class StudentsController < ApplicationController
     SQL
   end
 
+  def find_survey_by_slug
+    if params[:survey_id].blank? && params[:survey_slug].present?
+      survey = Survey.find_by_slug(params[:survey_slug])
+      params[:survey_id] = survey.id if survey.present?
+    end
+  end
+
 end