Remove PairProgrammingExerciseFeedback

* Remove view, controller, routes & policy for PairProgrammingExerciseFeedback
* Keep model & database table

app/models/exercise.rb

@@ -593,8 +593,6 @@ class Exercise < ApplicationRecord
   private :valid_submission_deadlines?
 
   def needs_more_feedback?(submission)
-    return false if PairProgramming23Study.experiment_course?(submission.study_group_id)
-
     if submission.normalized_score.to_d == BigDecimal('1.0')
       user_exercise_feedbacks.final.size <= MAX_GROUP_EXERCISE_FEEDBACKS
     else

app/models/pair_programming_exercise_feedback.rb

@@ -12,6 +12,32 @@ class PairProgrammingExerciseFeedback < ApplicationRecord
   scope :intermediate, -> { where.not(normalized_score: 1.00) }
   scope :final, -> { where(normalized_score: 1.00) }
 
+  enum difficulty: {
+    too_easy: 0,
+    bit_too_easy: 1,
+    just_right: 2,
+    bit_too_difficult: 3,
+    too_difficult: 4,
+  }, _prefix: true
+
+  enum user_estimated_worktime: {
+    less_5min: 0,
+    between_5_and_10min: 1,
+    between_10_and_20min: 2,
+    between_20_and_30min: 3,
+    more_30min: 4,
+  }, _prefix: true
+
+  enum reason_work_alone: {
+    found_no_partner: 0,
+    too_difficult_to_find_partner: 1,
+    faster_alone: 2,
+    not_working_with_strangers: 3,
+    prefer_to_work_alone: 4,
+    accidentally_alone: 5,
+    other: 6,
+  }, _prefix: true
+
   def to_s
     'Pair Programming Exercise Feedback'
   end

app/models/submission.rb

@@ -121,18 +121,12 @@ class Submission < ApplicationRecord
   end
 
   def redirect_to_feedback?
-    return false if PairProgramming23Study.experiment_course?(study_group_id)
-
     # Redirect 10% of users to the exercise feedback page. Ensure, that always the same
     # users get redirected per exercise and different users for different exercises. If
     # desired, the number of feedbacks can be limited with exercise.needs_more_feedback?(submission)
     (contributor_id + exercise.created_at.to_i) % 10 == 1
   end
 
-  def redirect_to_survey?
-    cause == 'submit' && pair_programming_exercise_feedback.blank? && PairProgramming23Study.experiment_course?(study_group_id)
-  end
-
   def own_unsolved_rfc(user)
     Pundit.policy_scope(user, RequestForComment).joins(:submission).where(submission: {contributor:}).unsolved.find_by(exercise:)
   end