pass_value_in_init_method_in_forms

###### in forms.py
class YourForm(forms.ModelForm):

    class Meta:
        model = YourModel
        fields = [
           'product ', 'vendor', '',  '', '', # your fields
        ]

    #
    def __init__(self, *args, ven_id, pro_id, **kwargs):
        self.vendor = ven_id
        self.product = pro_id
        super(YourForm, self).__init__(*args, **kwargs)
        self.fields['vendor'].queryset = Vendor.objects.filter(
            id=self.vendor)
        self.fields['product'].queryset = Product.objects.filter(
            id=self.product)


#### in views.py

def edit_inventory(request, inv_id, ven_id, pro_id):
    qs = Inventory.objects.get_inventory_by_id(id=inv_id)

    form = InventoryForm(request.POST or None, ven_id=ven_id, pro_id=pro_id, instance=qs)
    if form.is_valid():
        save_form = form.save()
        save_form.updateduser = request.user
        save_form.vendor_id = ven_id
        save_form.product_id = pro_id
        save_form.save()

        messages.success(
            request, 'Save changes to inventory done successfully ... ')
        return redirect(reverse('inventories:edit_inventory', args=(inv_id, ven_id, pro_id,)))

    context = {
        'form': form,
        'qs': qs,
        'title': 'Edit Inventory',
    }
    return render(request, 'inventories/edit_inventory.html', context)