Merge pull request #117 from openHPI/ImproveUserfeedback

added user feedback page after submission of scores

app/models/user_exercise_feedback.rb

@@ -1,8 +1,11 @@
 class UserExerciseFeedback < ActiveRecord::Base
+  include Creation
 
-  belongs_to :user, polymorphic: true
   belongs_to :exercise
 
   validates :user_id, uniqueness: { scope: [:exercise_id, :user_type] }
 
+  def to_s
+    "User Exercise Feedback"
+  end
 end