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我正在尝试SubmissionsListView为 Wagtail 管理员子类化。我正在按照本教程和本教程中的说明进行操作。

这是我的代码：

class CustomSubmissionsListView(SubmissionsListView):

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        if not self.is_export:
            # generate a list of field types, the first being the injected 'submission date'
            field_types = ['user'] + [field.field_type for field in self.form_page.get_form_fields()]
            data_rows = context['data_rows']

            DocumentModel = get_document_model()

            for data_row in data_rows:

                fields = data_row['fields']

                for idx, (value, field_type) in enumerate(zip(fields, field_types)):
                    if field_type == 'document' and value:
                        doc = DocumentModel.objects.get(pk=value)
                        url = reverse('wagtaildocument:edit', args=(doc.id,))
                        # build up a link to the image, using the image title & id
                        fields[idx] = format_html(
                            "<a href='{}'>{}</a>",
                            url,
                            doc.title,
                            value
                        )

        return context

我得到的错误是：

  File "/home/dave/sandbox/clients/devnw/devnw/web/products/models.py", line 161, in get_context_data
if not self.is_export:
    AttributeError: 'CustomSubmissionsListView' object has no attribute 'is_export'

我无法弄清楚发生了什么。`is_export' 确实存在于父模块中。任何指针？

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