Django 将具有特定属性的自定义用户添加到'；朋友'；列表

我已经实现了从整个用户列表中将用户添加到“朋友列表”的逻辑

型号.py

class VendorList(models.Model):
    users = models.ManyToManyField(User)
    current_user = models.ForeignKey(User, related_name='owner', on_delete=models.SET_NULL, null=True)

    @classmethod
    def add_vendor(cls, current_user, new_vendor):
        vendor, created = cls.objects.get_or_create(
            current_user=current_user
        )
        vendor.users.add(new_vendor)

    @classmethod
    def remove_vendor(cls, current_user, new_vendor):
        vendor, created = cls.objects.get_or_create(
            current_user=current_user
        )
        vendor.users.remove(new_vendor)

class VendorListView(TemplateView):
    template_name = 'event/vendor_list.html'

    def get(self, request):
        #form = EventItemModelForm()
        users = User.objects.exclude(id=request.user.id)
        vendor = VendorList.objects.get(current_user=request.user)
        vendors = vendor.users.all()

        args = {
            #'form': form, 
            'users': users, 'vendors': vendors
        }
        return render(request, self.template_name, args)

def change_vendor_list(request, operation, pk):
    vendor = User.objects.get(pk=pk)
    if operation == 'add':
        VendorList.add_vendor(request.user, vendor)
    elif operation == 'remove':
        VendorList.remove_vendor(request.user, vendor)
    return redirect('/vendors/')

视图.py

class VendorList(models.Model):
    users = models.ManyToManyField(User)
    current_user = models.ForeignKey(User, related_name='owner', on_delete=models.SET_NULL, null=True)

    @classmethod
    def add_vendor(cls, current_user, new_vendor):
        vendor, created = cls.objects.get_or_create(
            current_user=current_user
        )
        vendor.users.add(new_vendor)

    @classmethod
    def remove_vendor(cls, current_user, new_vendor):
        vendor, created = cls.objects.get_or_create(
            current_user=current_user
        )
        vendor.users.remove(new_vendor)

class VendorListView(TemplateView):
    template_name = 'event/vendor_list.html'

    def get(self, request):
        #form = EventItemModelForm()
        users = User.objects.exclude(id=request.user.id)
        vendor = VendorList.objects.get(current_user=request.user)
        vendors = vendor.users.all()

        args = {
            #'form': form, 
            'users': users, 'vendors': vendors
        }
        return render(request, self.template_name, args)

def change_vendor_list(request, operation, pk):
    vendor = User.objects.get(pk=pk)
    if operation == 'add':
        VendorList.add_vendor(request.user, vendor)
    elif operation == 'remove':
        VendorList.remove_vendor(request.user, vendor)
    return redirect('/vendors/')

它工作并提供我可以添加到列表中的所有用户的列表。但是，我需要过滤这个“整个”列表，并只显示具有“is\U供应商”属性的用户（类似于is\U员工）。 我应该在哪里筛选模型或视图中的用户？我试过了

vendors = vendor.users.filter(is_vendor=True)

---

这不起作用。

我发现有一个可用的筛选选项列表。我需要像这样使用供应商，而不是筛选供应商：

vendors = vendor.users.filter(vendor=True)