python - data 必须类似于 QuerySet(具有 count() 和 order_by())或支持 list(data) —— NoneType 两者都不具备

Question

我正在使用 Django-table2 作为 SingleTableMixin，并且收到此错误，但我无法解决该错误。错误说我需要在查询中提供数据才能使其工作。以下是代码并请求指导。

class ProductListView(SingleTableMixin, generic.TemplateView):

    template_name = 'dashboard/catalogue/product_list.html'
    form_class = ProductSearchForm
    productclass_form_class = ProductClassSelectForm
    table_class = ProductTable
    context_table_name = 'products'

    def get_context_data(self,**kwargs):
        ctx = super(ProductListView, self).get_context_data(**kwargs)
        ctx['form'] = self.form
        ctx['productclass_form'] = self.productclass_form_class()
        return ctx

    def get_description(self, form):
        if form.is_valid() and any(form.cleaned_data.values()):
            return _('Product search results')
        return _('Products')

    def get_table(self, **kwargs):
        if 'recently_edited' in self.request.GET:
            kwargs.update(dict(orderable=False))

        table = super(ProductListView, self).get_table(**kwargs)
        table.caption = self.get_description(self.form)
        return table

    def get_table_pagination(self):
        return dict(per_page=20)

    def filter_queryset(self, queryset):

        return filter_products(queryset, self.request.user)

    def get_queryset(self):

        queryset = Product.browsable.base_queryset()
        queryset = self.filter_queryset(queryset)
        queryset = self.apply_search(queryset)
        return queryset

回溯:

Traceback:
File "C:\Python27\lib\site-packages\django\core\handlers\base.py" in get_response
  132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Python27\lib\site-packages\django\contrib\auth\decorators.py" in _wrapped_view
  22.                 return view_func(request, *args, **kwargs)
File "C:\Python27\lib\site-packages\django\views\generic\base.py" in view
  71.             return self.dispatch(request, *args, **kwargs)
File "C:\Python27\lib\site-packages\django\views\generic\base.py" in dispatch
  89.         return handler(request, *args, **kwargs)
File "C:\Python27\lib\site-packages\django\views\generic\base.py" in get
  158.         context = self.get_context_data(**kwargs)
File "C:\Users\AliKhan\supermarket\market\dashboard\catalogue\views.py" in get_context_data
  77.         ctx = super(ProductListView, self).get_context_data(**kwargs)
File "C:\Python27\lib\site-packages\django_tables2\views.py" in get_context_data
  107.         table = self.get_table(**self.get_table_kwargs())
File "C:\Users\AliKhan\supermarket\market\dashboard\catalogue\views.py" in get_table
  91.         table = super(ProductListView, self).get_table(**kwargs)
File "C:\Python27\lib\site-packages\django_tables2\views.py" in get_table
  82.         table = table_class(self.get_table_data(), **kwargs)
File "C:\Python27\lib\site-packages\django_tables2\tables.py" in __init__
  348.         self.data = self.TableDataClass(data=data, table=self)
File "C:\Python27\lib\site-packages\django_tables2\tables.py" in __init__
  45.             ' list(data) -- {} has neither'.format(type(data).__name__)

Exception Type: ValueError at /dashboard/catalogue/
Exception Value: data must be QuerySet-like (have count() and order_by()) or support list(data) -- NoneType has neither

Answer 1

您的 Django settings.py 无法收集 django-table2 及其依赖项。尝试从 shell 导入它。代码没有问题。你在尝试虚拟环境吗？如果是，那么哪个操作系统？如果是 Windows，那么您必须先全局安装 django-oscar，然后才能在 virtualenv 中尝试。