feat: add is_published flag to assignments

lmsege/lms/views.py

@@ -36,7 +36,8 @@ def home(request):
 @user_passes_test(is_student, login_url='/login/')
 def dashboard(request):
     assignments = Assignment.objects.filter(
-        Q(assign_to_all=True) | Q(assigned_students=request.user)
+        Q(assign_to_all=True) | Q(assigned_students=request.user),
+        is_published=True
     ).distinct().order_by('-created_at')
     
     # Check which ones the student has submitted
@@ -52,7 +53,7 @@ def dashboard(request):
 @login_required
 @user_passes_test(is_student, login_url='/login/')
 def assignment_detail(request, pk):
-    assignment = get_object_or_404(Assignment, pk=pk)
+    assignment = get_object_or_404(Assignment, pk=pk, is_published=True)
     questions = assignment.questions.all()
     
     # Try to get existing submission