review points

app/models/user.rb

@@ -13,7 +13,7 @@ class User < ApplicationRecord
   has_many :user_proxy_exercise_exercises, as: :user
   has_many :user_exercise_interventions, as: :user
   has_many :interventions, through: :user_exercise_interventions
-  has_one :codeharbor_link
+  has_one :codeharbor_link, dependent: :destroy
   accepts_nested_attributes_for :user_proxy_exercise_exercises
 
 

app/policies/codeharbor_link_policy.rb

@@ -8,11 +8,11 @@ class CodeharborLinkPolicy < ApplicationPolicy
   end
 
   def new?
-    teacher?
+    teacher? || admin?
   end
 
   def create?
-    teacher?
+    teacher? || admin?
   end
 
   def edit?

app/services/proforma_service/import.rb

@@ -28,13 +28,9 @@ module ProformaService
 
     def base_exercise
       exercise = Exercise.find_by(uuid: @task.uuid)
-      if exercise
-        return exercise if ExercisePolicy.new(@user, exercise).update?
+      return exercise if exercise && ExercisePolicy.new(@user, exercise).update?
 
-        return Exercise.new(uuid: SecureRandom.uuid, unpublished: true)
-      end
-
-      Exercise.new(uuid: @task.uuid || SecureRandom.uuid, unpublished: true)
+      Exercise.new(uuid: @task.uuid, unpublished: true)
     end
 
     def import_multi