get_template_names(self) 在 TemplateView 中不起作用

Question

我正在尝试使用来自django-pdfkit 的PDFView。问题是我没有一个模板。相反，我有 4 个模板。选择的模板取决于 request.GET 参数。

所以我创建了一个名为 Test 的 View，它扩展了 PDFView。

class Test(PDFView):

    def get_template_names(self):
        # don't bother with chosing template for now
        return ["pdf/dobropis_pdf_template.html"]

    def get_context_data(self, **kwargs):
        doklad = get_object_or_404(Doklad, pk=self.request.GET.get('id'))
        return {'doklad':doklad}

问题是如果我不指定template_name，它会返回：

TemplateDoesNotExist at /render/doklad/ None

所以我想get_template_names 方法甚至没有被调用。

为什么会这样？我怎样才能让它工作？

这是来自urls.py：

url(r'^render/doklad/', views.Test.as_view(), name="doklad_to_pdf"),

这是PDFView（以防万一）：

class PDFView(TemplateView):
    #: Set to change the filename of the PDF.
    filename = None

    #: Set to default the PDF display to inline.
    inline = False

    #: Set pdfkit options dict.
    pdfkit_options = None

    def get(self, request, *args, **kwargs):
        """
        Return a HTTPResponse either of a PDF file or HTML.

        :rtype: HttpResponse
        """
        if 'html' in request.GET:
            # Output HTML
            content = self.render_html(*args, **kwargs)
            return HttpResponse(content)

        else:
            # Output PDF
            content = self.render_pdf(*args, **kwargs)

            response = HttpResponse(content, content_type='application/pdf')

            if (not self.inline or 'download' in request.GET) and 'inline' not in request.GET:
                response['Content-Disposition'] = 'attachment; filename=%s' % self.get_filename()

            response['Content-Length'] = len(content)

            return response

    def render_pdf(self, *args, **kwargs):
        """
        Render the PDF and returns as bytes.

        :rtype: bytes
        """
        html = self.render_html(*args, **kwargs)

        options = self.get_pdfkit_options()
        if 'debug' in self.request.GET and settings.DEBUG:
            options['debug-javascript'] = 1

        kwargs = {}
        wkhtmltopdf_bin = os.environ.get('WKHTMLTOPDF_BIN')
        if wkhtmltopdf_bin:
            kwargs['configuration'] = pdfkit.configuration(wkhtmltopdf=wkhtmltopdf_bin)

        pdf = pdfkit.from_string(html, False, options, **kwargs)

        return pdf

    def get_pdfkit_options(self):
        """
        Returns ``self.pdfkit_options`` if set otherwise a default dict of options to supply to pdfkit.

        :rtype: dict
        """
        if self.pdfkit_options is not None:
            return self.pdfkit_options

        return {
            'page-size': 'A4',
            'encoding': 'UTF-8',
        }

    def get_filename(self):
        """
        Return ``self.filename`` if set otherwise return the template basename with a ``.pdf`` extension.

        :rtype: str
        """
        if self.filename is None:
            name = splitext(basename(self.template_name))[0]
            return '{}.pdf'.format(name)

        return self.filename

    def render_html(self, *args, **kwargs):
        """
        Renders the template.

        :rtype: str
        """
        static_url = '%s://%s%s' % (self.request.scheme, self.request.get_host(), settings.STATIC_URL)
        media_url = '%s://%s%s' % (self.request.scheme, self.request.get_host(), settings.MEDIA_URL)

        with override_settings(STATIC_URL=static_url, MEDIA_URL=media_url):
            template = loader.get_template(self.template_name)
            context = self.get_context_data(*args, **kwargs)
            html = template.render(context)
            return html

Answer 1

通过覆盖get，您绕过了所有该视图的内置功能，包括调用get_template_names。这很少是正确的做法。

但是，鉴于您显示的代码，您不能自己从render_html 调用该方法的原因是什么？或者只是在那里内联逻辑。