python - Ensuring Dependent Selection of Sub-Departments Based on Main Department in Django - Stack Overflow

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I have models for Department and SubDepartment, where each SubDepartment should be linked to a specific Department. However, when selecting a SubDepartment, all available sub-departments are listed instead of filtering them based on the selected Department.

Here are my models, forms, and views:

[enter image description here][1][here before selecting sub department i have to select main department and sub comes under main department.][2]


  [1]: .png
  [2]: .png

these are the models. models.py

class Department(models.Model):
    department_name = models.CharField(max_length=255)  # ✅ Correct field
    company_name = models.ForeignKey(CompanyName, on_delete=models.CASCADE)
    status = models.CharField(max_length=20, choices=[('active', 'Active'), ('inactive', 'Inactive')])

    def __str__(self):
        return self.department_name


class SubDepartment(models.Model):
    sub_department_name=models.CharField(max_length=100,null=False,blank=False)
    department_name=models.ForeignKey(Department,on_delete=models.CASCADE)
    company_name=models.ForeignKey(CompanyName,on_delete=models.CASCADE)
    status=models.CharField(max_length=20, choices=[('active','Active'),('inactive','Inactive')])

    def __str__(self):

should i make any change in forms or views?
forms.py

class DepartmentForm(forms.ModelForm):
    class Meta:
        model = Department
        fields = ['department_name', 'company_name', 'status']


class SubDepartmentForm(forms.ModelForm):
    class Meta:
        model = SubDepartment
        fields = ['sub_department_name', 'department_name', 'company_name', 'status']

i already give one to many into the fields but its not working as dependant. here when i select the department the corresponding sub department only should come but without selecting the dept the sub department is listing.

**views.py**

def dept_view(request):
    if request.method == "POST":
        form = DepartmentForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('department-view')
    else:
        form = DepartmentForm()
    depts = Department.objects.all()
    return render(request, "dept.html", {"form": form, "depts": depts})


# @login_required(login_url="signin")
def delete_department(request, department_id):
    if request.method == "POST":
        department = get_object_or_404(Department, id=department_id)
        department.delete()
        return JsonResponse({"success": True})
    return JsonResponse({"success": False})


def sub_dept_view(request):
    if request.method == "POST":
        form = SubDepartmentForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect("sub-department")  # Redirect after successful submission
    else:
        form = SubDepartmentForm()

    sub_depts = SubDepartment.objects.all()
    return render(request, "sub_department.html", {"form": form, "sub_depts": sub_depts})


def delete_sub_department(request, sub_department_id):
    if request.method == "POST":
        sub_department = get_object_or_404(SubDepartment, id=sub_department_id)
        sub_department.delete()
        return JsonResponse({"success": True})
    return JsonResponse({"success": False})

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