From 3cd2be01de15268bfd55c10ac3e2436438009f2f Mon Sep 17 00:00:00 2001
From: Sebastian Serth <Sebastian.Serth@hpi.de>
Date: Wed, 13 Apr 2022 20:55:44 +0200
Subject: [PATCH] Include hidden exercises for other teachers of the same study
 group

---
 app/policies/exercise_policy.rb | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/app/policies/exercise_policy.rb b/app/policies/exercise_policy.rb
index 2c36b47e..993fe67c 100644
--- a/app/policies/exercise_policy.rb
+++ b/app/policies/exercise_policy.rb
@@ -38,7 +38,13 @@ class ExercisePolicy < AdminOrAuthorPolicy
       if @user.admin?
         @scope.all
       elsif @user.teacher?
-        @scope.where('user_id = ? OR public = TRUE', @user.id)
+        @scope.where(
+          'user_id IN (SELECT user_id FROM study_group_memberships WHERE study_group_id IN (?))
+          OR (user_id = ? AND user_type = ?)
+          OR public = TRUE',
+          @user.study_groups.pluck(:id),
+          @user.id, @user.class.name
+        )
       else
         @scope.none
       end