AttributeError 'QuerySet' 对象没有属性 '_meta'

如何解决AttributeError 'QuerySet' 对象没有属性 '_meta'

当我尝试加载页面时出现此错误。

这是视图：

def neworder(request):
    products = Product.objects.all().prefetch_related('supplier')
    total_products = products.count()
    supplier = supplier.objects.all()
    form = OrderForm(instance=supplier)

    if request.method == 'POST':
        form = OrderForm(request.POST,instance=supplier)
        if form.is_valid():
            print('order updated')
            form.save()
            return redirect('suppliers')

    context = {'products': products,'suppliers': suppliers,'total_products': total_products}
    context['form'] = form
    return render(request,'crmapp/neworder.html',context)

这是我的表格

class OrderForm(ModelForm):
    class Meta:
        model = Order
        fields = [
            'supplier','item','item_qty',]

谁能告诉我我做错了什么？