Set bonus points for survey via LTI parameter

app/controllers/sessions_controller.rb

@@ -76,6 +76,7 @@ class SessionsController < ApplicationController
   private
 
   def redirect_to_survey
+    if params[:custom_bonus_points]
       # The following code is taken from store_lti_session_data(params) & send_score_for(submission, user)
       # It gives a bonus point to users who opened the survey
       begin
@@ -85,6 +86,7 @@ class SessionsController < ApplicationController
       rescue IMS::LTI::XMLParseError, Net::OpenTimeout, Net::ReadTimeout, Errno::ECONNRESET, SocketError, EOFError
         # We don't do anything here because it is only a bonus point and we want the users to do the survey
       end
+    end
 
     # This method is taken from Xikolo and slightly adapted.
     # Forward arbitrary optional query params to LimeSurvey

app/models/event.rb

@@ -9,7 +9,7 @@ class Event < ApplicationRecord
 
   validates :category, presence: true
 
-  # We temporary allow an event to be stored without data.
+  # We allow an event to be stored without data for pair programming (pp).
   # This is useful if the category (together with the user and exercise) is already enough.
   validates :data, presence: true, if: -> { %w[pp_start_chat pp_invalid_partners pp_work_alone].exclude?(category) }