Show only mission correct for student phase, add only one preference per week

cntmanage/flightslot/custom/student_permissions.py

@@ -5,13 +5,17 @@ from ..models.weekpref import WeekPreference
 
 from datetime import date
 
+def has_week_add_permission(request: HttpRequest):
+    if hasattr(request.user, 'student'):
+        student: Student = request.user.student
+        current_week: int = date.today().isocalendar().week
+        return student.active and not WeekPreference.objects.filter(student_id=student.id, week=current_week).count()
+    return True
+
 # allow add, modify, delete depending on a set of requirements
 def has_edit_permission(request: HttpRequest, obj: WeekPreference | None = None) -> bool:
     if hasattr(request.user, 'student'):
-        student: Student = request.user.student
-        if not student.active:
-            return False
         current_week: int = date.today().isocalendar().week
-        if obj and (current_week > obj.week or not student.active):
+        if obj and current_week > obj.week:
             return False
     return True