Question

我刚刚开始使用Django Rest Framework，所以我还不完全确定到底发生了什么。但我有一个用户模型，一个朋友模型和一个帖子模型，我还有我的序列化器和视图。但是，我无法弄清楚如何从用户的朋友那里归还所有帖子。任何帮助将不胜感激。

models.py

class CustomUser(AbstractBaseUser, PermissionsMixin):
    email = models.EmailField('email address', unique=True, db_index=True)
    password1 = models.CharField(max_length=50)
    username = models.CharField('username', max_length=50, unique=True, db_index=True)
    image = models.FileField(upload_to='photos', null=True, blank=True)
    joined = models.DateTimeField(auto_now_add=True)
    is_active = models.BooleanField(default=True)
    is_admin = models.BooleanField(default=False)
    date_joined = models.DateTimeField(_('date joined'), default=timezone.now)

    USERNAME_FIELD = 'username'
    REQUIRED_FIELDS = []

    objects = CustomUserManager()

    def __unicode__(self):
        return self.username

    class Meta:
        unique_together = (('username', 'password1'),)



class Friendship(models.Model):
    created_at = models.DateTimeField(auto_now_add=True, editable=False)
    creator = models.ForeignKey(CustomUser, related_name="friendship_creator")
    friend = models.ForeignKey(CustomUser, related_name="friends")


class Post(models.Model):
    poster = models.ForeignKey(CustomUser)
    body = models.CharField(max=200)

    def save(self, *args, **kwargs):
        super(Post, self).save(*args, **kwargs)

serializers.py

class FriendSerializer(HyperlinkedModelSerializer):
    class Meta:
        model = Friendship
        fields = ('creator', 'friend', 'created_at')
        readonly_fields = 'created_at'


class CustomUserSerializer(HyperlinkedModelSerializer):
    friends = FriendSerializer(many=True)

    class Meta:
        model = CustomUser
        fields = ('email', 'username', 'password1', 'image', 'friends')
        readonly_fields = 'image'

views.py

class FriendViewSet(ModelViewSet):
    queryset = CustomUser.objects.all()
    serializer_class = FriendSerializer


class UserProfileViewSet(RetrieveModelMixin, UpdateModelMixin, GenericViewSet):
    queryset = CustomUser.objects.all()
    serializer_class = CustomUserSerializer

Answer 1

这可能会让你开始，

所以你需要先做的就是得到所有朋友，你可以通过

来做到这一点

friends = <user_objects>.Friendship_set.all()

详细了解here。

既然您拥有该特定用户的所有朋友，请将他们的ID转换为列表并使用列表过滤器。

Post.objects.filter(poster__id__in=[list_of_ids_of_friends])

有关外键属性的过滤，请参阅this answer。

Django-DRF查看朋友发表的所有帖子

1 个答案: