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
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问题描述
请查看以下模型:
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)
如何获取一组特定专辑的照片集???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?
我尝试过
# 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'
请引导我朝正确的方向前进。谢谢。
Please guide me to the right direction. Thank you.
推荐答案
您快到了。您应该使用 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()
例如,小写的模型名称带有 set
i.e the lowercase modelname with _set
如果要在1个查询中使用照片列表,则
If you want the list of photos in 1 query,
photos = Photo.objects.filter(album__user__username='tika')
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