Filtering results based on the value of other fields in the form - issue when i reselect the first field then second field does none change to none

[sasikumar1978k]

issue: when i reselect the first field then second field does none change to none

from apps.home.models import *
class getdegree_view(autocomplete.Select2QuerySetView):
    def get_queryset(self):
        # Don't forget to filter out results depending on the visitor !
        if not self.request.user.is_authenticated:

            queryset = degree.objects.none()
            return queryset

        getapprovedstf = get_approved_staffs_joined_objects('staff_working_details', Office_Code_id=self.request.user.office_code_id)
        qs = degree.objects.all()

        if self.q:
            qs = qs.filter(name__istartswith=self.q)

        return qs

class getdegreesub_view(autocomplete.Select2QuerySetView):
    def get_queryset(self):
        if not self.request.user.is_authenticated:
            return degreesub.objects.none()

        qs = degreesub.objects.all()

        degree = self.forwarded.get('degree', None)

        if degree:
            qs = qs.filter(degree=degree)

        if self.q:
            qs = qs.filter(name__istartswith=self.q)

        return qs

 widgets = {

            "course_admn_date": DatePickerInput(),
            "course_completion_date": DatePickerInput(),
            "pass_date": DatePickerInput(),

             'degree': autocomplete.ModelSelect2(
                url='getdegree_view', 
                attrs={
                # Set some placeholder
                'data-placeholder': '--Select--',
                # Only trigger autocompletion after 3 characters have been typed
                'data-minimum-input-length': 0,
                'style': 'width: 100%;'  # Set the width to 100%

            },),

            'degreesubject': autocomplete.ModelSelect2(
                url='getdegreesub_view', 
                forward=['degree'],
                attrs={
                # Set some placeholder
                'data-placeholder': '--Select--',
                # Only trigger autocompletion after 3 characters have been typed
                'data-minimum-input-length': 0,
                'style': 'width: 100%;'  # Set the width to 100%

            },)

        }