django - 从多对一关系中获取对象集 [英] django - Get the set of objects from Many To One relationship

问题描述

请看一下这些模型:

class Album(models.Model):
    user = models.ForeignKey(User)
    name = models.CharField(max_length=200)
    pub_date = models.DateTimeField(default=datetime.now)


class Photo(models.Model):
    album = models.ForeignKey(Album, default=3)
    image = models.ImageField(upload_to=get_upload_file_name)
    caption = models.CharField(max_length=200)
    pub_date = models.DateTimeField(default=datetime.now)

如何获取特定相册的照片集???以及如何从照片实例本身获取相册?

How do I get the the set of photos for a particular album??? And how to get the Album from the photo instance itself?

我试过了:

# To get the set of photos from the user (tika) album:
>>>t = User.objects.get(username='tika')
>>>t_album = Album.objects.get(user=t)
>>>t_album 
<Album: tika_album>
>>>t_album.image_set.all()
AttributeError: 'Album' Object has no attribute 'image_set'

请指导我走向正确的方向.谢谢.

Please guide me to the right direction. Thank you.

推荐答案

您就快到了.你应该使用 photo_set 而不是 image_set

You are almost there. you should be using photo_set instead of image_set

>>>t_album.photo_set.all() 

即带有 _set 的小写模型名称

i.e the lowercase modelname with _set

如果您想要 1 个查询中的照片列表，

If you want the list of photos in 1 query,

photos = Photo.objects.filter(album__user__username='tika')

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