调整缩略图django Heroku的大小，“后端不支持绝对路径"

我已经使用Django在Heroku上部署了一个应用程序，到目前为止，它似乎仍然可以正常工作，但是在上传新缩略图时遇到了问题.我已经安装了枕头，以便在上载图像时可以调整图像的大小，并保存调整后的缩略图，而不是原始图像.但是，每次上传时，都会出现以下错误:此后端不支持绝对路径."当我重新加载页面时，新图像在那里，但是没有调整大小.我正在使用Amazon AWS来存储图像.

I've got an app deployed on Heroku using Django, and so far it seems to be working but I'm having a problem uploading new thumbnails. I have installed Pillow to allow me to resize images when they're uploaded and save the resized thumbnail, not the original image. However, every time I upload, I get the following error: "This backend doesn't support absolute paths." When I reload the page, the new image is there, but it is not resized. I am using Amazon AWS to store the images.

我怀疑这与我的models.py有关.这是我的调整大小代码:

I'm suspecting it has something to do with my models.py. Here is my resize code:

class Projects(models.Model):
    project_thumbnail = models.FileField(upload_to=get_upload_file_name, null=True, blank=True)

    def __unicode__(self):
        return self.project_name

    def save(self):
        if not self.id and not self.project_description:
            return

        super(Projects, self).save()
        if self.project_thumbnail:
            image = Image.open(self.project_thumbnail)
            (width, height) = image.size

        image.thumbnail((200,200), Image.ANTIALIAS)
            image.save(self.project_thumbnail.path)

有什么我想念的吗?我需要告诉其他吗?

Is there something that I'm missing? Do I need to tell it something else?