django - 如何获取上传到ima​​gefield的文件的文件名？

Question

我需要在模板中传递在实例图像字段中上传的文件的文件名。

我的类(class):

def conference_directory_path(instance, filename):
    return 'dialogues/conferences/conference_{0}/avatar/{1}'.format(instance.id, filename)

class Dialogue(models.Model):
    ...
    avatar = models.ImageField(upload_to=conference_directory_path, blank=True)
    ...

模板:

<img src="/static/dialogues/conferences/conference_{{ dialogue.id }}/avatar/{{ dialogue.avatar.filename }}" alt="">

但是dialog.avatar.filename在渲染后是空字符串。怎么了？对话是对话模型的一个实例。

Answer 1

数据库中存储的实际上是文件名而不是数据。此处描述了如何访问它:

https://docs.djangoproject.com/en/1.10/ref/models/fields/#filefield

All that will be stored in your database is a path to the file (relative to MEDIA_ROOT). You’ll most likely want to use the convenience url attribute provided by Django. For example, if your ImageField is called mug_shot, you can get the absolute path to your image in a template with {{ object.mug_shot.url }}.

所以我们有

<img src="{{ dialogue.avatar.url }}" alt="">