Add exercise feedback page for pair programming study

app/models/submission.rb

@@ -17,6 +17,8 @@ class Submission < ApplicationRecord
   has_many :testruns
   has_many :structured_errors, dependent: :destroy
   has_many :comments, through: :files
+  has_one :user_exercise_feedback
+  has_one :pair_programming_exercise_feedback
 
   belongs_to :external_users, lambda {
                                 where(submissions: {contributor_type: 'ExternalUser'}).includes(:submissions)
@@ -118,12 +120,18 @@ 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