上传图片时创建动态路径 [英] Creating a dynamic path when I upload images

问题描述

我正在尝试为用户上传图片时创建动态路径。它的工作原理如下：

I'm trying to create a dynamic path for when my users upload images. It works something like this:

查看：

photo = Photo(...)
photo.save()

photo.original.save(filename, content)

型号：

album = models.ForeignKey(Album)
original = models.ImageField(upload_to="photos/%s/o" % str(album.id), max_length=200)

但是当我尝试这样做时，Django没有办法说。

But when I try to do this, Django says no way.

Exception Value:    
'ForeignKey' object has no attribute 'id'

如何访问ForeignKey对象的模型成员以这种方式？

How can I access the model members of a ForeignKey object in this manner?

谢谢。

推荐答案

使用回调（callable）：< a href =https://docs.djangoproject.com/en/dev/ref/models/fields/#django.db.models.FileField.upload_to =nofollow> https://docs.djangoproject.com /en/dev/ref/models/fields/#django.db.models.FileField.upload_to

Use a callback (callable): https://docs.djangoproject.com/en/dev/ref/models/fields/#django.db.models.FileField.upload_to

def fancy_path(instance, filename):
    return 'fancy_path/file_%s.xml' % self.instance.album.id

original = models.ImageField(upload_to=fancy_path, max_length=200)

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