Question

我已尝试过其他问题，但我仍然遇到一些问题。

我有2个型号：

class Media(models.Model):
    name = models.CharField(max_length=100)
    media = models.CharField(max_length=10, choices=MEDIA_TYPE)

class Review(models.Model):
    message = models.CharField(max_length=10)
    submitter = models.ForeignKey(User)
    media = models.ForeignKey(Media, related_name='rev_media')

我想去做像

这样的事情

blaw = Media.objects.all()
for a in blaw:
    print (all the reviews to have to do with this one media object)

Answer 1

rev_media，您的related_name，应该为您提供将其作为外键的所有评论：

blaw = Media.objects.all()
for a in blaw:
    print media.rev_media.all()

Answer 2

由于您有related_name，因此可以使用a.rev_media.all()获取关联对象列表。

现在，你可以这样做：

media_qs = Media.objects.all()
for media in media_qs:
    reviews = media.rev_media.all() #basically, this is the queryset of all the associated reviews for this media object.
    if reviews.exists():

        print ", ".join([review.message for review in reviews])

Django ForeignKey得到了结果

2 个答案: