Python Django rest框架教程4：身份验证期间的AttributeError

我正在学习django rest框架教程，我不知道这里发生了什么

我创建了一个带有snippets属性的UserSerializer类，并完成了所有导入

#--!-coding: utf-8
from rest_framework import serializers
from snippets.models import Snippet
from django.contrib.auth.models import User

class SnippetSerializer(serializers.ModelSerializer):
    owner = serializers.ReadOnlyField(source='owner.username')

    class Meta:
        model = Snippet
        fields = ('id', 'title', 'code', 'linenos', 'language', 'style', 'owner')

class UserSerializer(serializers.ModelSerializer):
    snippets = serializers.PrimaryKeyRelatedField(many=True, queryset=Snippet.objects.all())

    class Meta:
        model = User
        fields = ('id', 'username', 'snippets')

然后我创建了UserList和UserDetails视图：

class UserList(generics.ListAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer

class UserDetail(generics.RetrieveAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer

我基本上遵循了教程，但是当我尝试访问一个用户端点时，我得到了一个AttributeError

AttributeError at /users/

'User' object has no attribute 'snippets'

我使用的是django 1.7.5和django rest框架3.0.5

我不知道这个特定版本是否有问题

编辑：

这是我的模型：

class Snippet(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    title = models.CharField(max_length=100, blank = True, default='')
    code = models.TextField()
    linenos = models.BooleanField(default=False)
    language = models.CharField(choices=LANGUAGE_CHOICES, default='python', max_length=100)
    style = models.CharField(choices=STYLE_CHOICES, default='friendly', max_length=100)
    owner = models.ForeignKey('auth.User')
    highlighted = models.TextField()

    class Meta:
        ordering = ('created',)

    def save(self, *args, **kwargs):
        """
        Usa o a biblioteca pygments para criar um representacao HTML com destaque do snippet
        """
        lexer = get_lexer_by_name(self.language)
        linenos = self.linenos and 'table' or False
        options = self.title and {'title': self.title} or {}
        formatter = HtmlFormatter(style=self.style, linenos=linenos, full=True, **options)
        self.highlighted = highlight(self.code, lexer, formatter)
        super(Snippet, self).save(*args, **kwargs)

---

在代码段模型中，需要将相关名称添加到所有者字段中

owner = models.ForeignKey('auth.User', related_name='snippets')

---

默认情况下，

User

模型是否有一个

snippets

字段？没有，但是因为外键@mattm@Bakuriu，我正在学习教程，好吗？我在UserSerializer类中添加了一个snippets字段，这就是我正在使用的。我使用了generics.ListAPIView来创建视图，所以它应该可以工作；manage.py migrate在添加代码段外键后？是否运行make migrations并在执行该操作后进行迁移@空指针