Fix query for users in same school class

Now only queries for the active school class instead of all school
classes

server/assignments/schema/types.py

@@ -59,7 +59,7 @@ class AssignmentNode(DjangoObjectType):
     def resolve_submissions(self, info, **kwargs):
         user = info.context.user
         if user.has_perm('users.can_manage_school_class_content'):
-            return self.submissions.filter(student__in=user.users_in_same_school_class()).filter(final=True)
+            return self.submissions.filter(student__in=user.users_in_active_school_class()).filter(final=True)
         return []
 
     def resolve_solution(self, info, **kwargs):

server/assignments/tests/test_feedback.py

@@ -38,6 +38,8 @@ class SubmissionFeedbackTestCase(SkillboxTestCase):
                 user=user,
                 school_class=school_class
             )
+            user.set_selected_class(school_class)
+
 
     def _create_submission_feedback(self, user, final, text, student_submission_id):
         return self.get_client(user).execute(UPDATE_SUBMISSION_FEEDBACK_MUTATION, variables={

server/users/models.py

@@ -73,6 +73,9 @@ class User(AbstractUser):
     def users_in_same_school_class(self):
         return User.objects.filter(school_classes__users=self.pk)
 
+    def users_in_active_school_class(self):
+        return self.selected_class.users.all() if self.selected_class is not None else []
+
     def get_teacher(self):
         if self.is_teacher():
             return self