python - Django ImageField.path 在保存方法中返回没有upload_to 的路径

Question

Django ImageField.path在save方法中返回没有upload_to的路径：

# models.py
class Message(models.Model):
image = models.ImageField(upload_to='mes-img', null=True, blank=True)

def image_tag(self):
    if self.image:
        # Printing "/base-dir/media/mes-img/image.png"
        print(self.image.path)
        # src=/media/mes-img/image.png
        return mark_safe('<img src="{0}" width="100" />'.format(self.image.url))

def save(self, force_insert=False, force_update=False, using=None, update_fields=None):
    # Returns "/base-dir/media/image.png", should return "/base-dir/media/mes-img/image.png"
    print(self.image.path)
    # Returns "/media/image.png", should return "/media/mes-img/image.png"
    print(self.image.url)

操作系统：Windows 10 64 位

Python 3.6.4

Django 2.0.2

Answer 1

upload_to 传递给Storage.save()方法，检查这部分docs。所以upload_to只有在图像保存后才会添加到路径中。尝试这样的事情：

 def save(self, force_insert=False, force_update=False, using=None, update_fields=None):
    super().save(force_insert, force_update, using, update_fields)
    print(self.image.path)
    print(self.image.url)

super().save()将自动保存图像实例。