什么是Django中使用的'get_source_filename（）'？

Question

我收到以下错误：

'MyProfile' object has no attribute 'get_source_filename'

以下代码来自之前回答的SO问题，所以我不确定get_source_filename（）是什么或者是什么。谷歌搜索没有任何结果。

class MyProfile(UserenaBaseProfile):
    coverpic = models.ImageField(upload_to="site_media/media/covers/", null=True, blank=True)

    def save(self, *args, **kwargs):
        # Did we have to resize the image?
        # We pop it to remove from kwargs when we pass these along
            image_resized = kwargs.pop('image_resized',False)
            super(MyProfile, self).save(*args, **kwargs)
            if self.coverpic:
                print "yes"
                basewidth = 300
                filename = self.get_source_filename()
                image = Image.open(filename)
                wpercent = (basewidth/float(image.size[0]))
                hsize = int((float(image.size[1])*float(wpercent)))
                img = image.resize((basewidth,hsize), PIL.Image.ANTIALIAS)
                self.coverpic = img
                self.coverpic.save