Add check if person is documentation teacher in relevant predicates

aleksis/apps/alsijil/util/predicates.py

@@ -381,10 +381,23 @@ def is_lesson_event_group_owner(user: User, obj: LessonEvent):
     return False
 
 
+@predicate
+def is_documentation_teacher(user: User, obj: Documentation):
+    """Predicate for teachers of a documentation.
+
+    Checks whether the person linked to the user is a teacher in the documentation.
+    """
+    if obj:
+        return user.person in obj.teachers
+    return False
+
+
 @predicate
 def can_view_documentation(user: User, obj: Documentation):
     """Predicate which checks if the user is allowed to view a documentation."""
     if obj:
+        if is_documentation_teacher(user, obj):
+            return True
         if obj.lesson_event:
             return (
                 is_lesson_event_teacher(user, obj.lesson_event)
@@ -400,6 +413,8 @@ def can_view_documentation(user: User, obj: Documentation):
 def can_edit_documentation(user: User, obj: Documentation):
     """Predicate which checks if the user is allowed to edit or delete a documentation."""
     if obj:
+        if is_documentation_teacher(user, obj):
+            return True
         if obj.lesson_event:
             return is_lesson_event_teacher(user, obj.lesson_event) | is_lesson_event_group_owner(
                 user, obj.lesson_event