lol i dont know what i am doing

app/forms.py

@@ -0,0 +1,44 @@
+from django import forms
+from django.utils.translation import gettext_lazy as _
+
+from app.models import Course, Marksheet, Subject
+
+# class MarksheetForm(forms.ModelForm):
+#     class Meta:
+#         model = Marksheet
+#         fields = "__all__"
+#
+#     def __init__(self, *args, **kwargs):
+#         super().__init__(*args, **kwargs)
+#
+#         if self.instance.pk and self.instance.course:
+#             self.fields["subject"].queryset = Subject.objects.filter(
+#                 course=self.instance.course,
+#                 semester_or_year_number=self.instance.period_number,
+#             )
+#         # else:
+#         # self.fields["subject"].queryset = Subject.objects.none()
+
+
+class SubjectForm(forms.ModelForm):
+    class Meta:
+        model = Subject
+        fields = ["name", "course", "semester_or_year_number", "teacher"]
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        if "course" in self.data:
+            try:
+                course_id = int(self.data.get("course"))
+                course = Course.objects.get(pk=course_id)
+                self.fields["semester_or_year_number"].choices = [
+                    (i, i) for i in range(1, course.duration + 1)
+                ]
+            except (ValueError, Course.DoesNotExist):
+                pass
+        elif self.instance.pk:
+            course = self.instance.course
+            self.fields["semester_or_year_number"].choices = [
+                (i, i) for i in range(1, course.duration + 1)
+            ]