Django的。覆盖模型保存

一些想法：

class Model(model.Model):    _image=models.ImageField(upload_to='folder')    thumb=models.ImageField(upload_to='folder')    description=models.CharField()    def set_image(self, val):        self._image = val        self._image_changed = True        # Or put whole logic in here        small = rescale_image(self.image,width=100,height=100)        self.image_small=SimpleUploadedFile(name,small_pic)    def get_image(self):        return self._image    image = property(get_image, set_image)    # this is not needed if small_image is created at set_image    def save(self, *args, **kwargs):        if getattr(self, '_image_changed', True): small=rescale_image(self.image,width=100,height=100) self.image_small=SimpleUploadedFile(name,small_pic)        super(Model, self).save(*args, **kwargs)

不确定是否可以在所有伪自动django工具中正常运行（例如：ModelForm，contrib.admin等）。