python - 需要字段的 django rest 框架错误

Question

我一直在关注 http://www.django-rest-framework.org/tutorial/4-authentication-and-permissions/ 上的教程(这非常好)但我已经到了最后，我正在运行命令

http -a admin:password123 POST http://127.0.0.1:8000/snippets/代码="打印789"

它给了我一个错误:

HTTP/1.1 400 Bad Request Allow: GET, POST, HEAD, OPTIONS Content-Length: 37 Content-Type: application/json Date: Wed, 28 Feb 2018 18:29:15 GMT Server: WSGIServer/0.2 CPython/3.6.3 Vary: Accept, Cookie X-Frame-Options: SAMEORIGIN

{ "owner": [ "This field is required." ] }

所有者字段在可浏览的 api 上也可见，为我创建的所有用户提供选项。虽然保存它时(浏览器或命令行)它确实保存了发出请求的用户，因此该部分是正确的。我认为它不应该在可浏览的 api 上可见，并且在 api 调用中不需要，因为它从请求中计算出来。

这是我的代码:

views.py:

class SnippetList(generics.ListCreateAPIView):
  queryset = Snippet.objects.all()
  serializer_class = SnippetSerializer
  permission_classes = (permissions.IsAuthenticatedOrReadOnly,)

  def perform_create(self, serializer):
    serializer.save(owner=self.request.user)

模型.py:

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', related_name='snippets', on_delete=models.CASCADE)
  highlighted = models.TextField()

  class Meta:
    ordering = ('created',)

  def save(self, *args, **kwargs):
    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)

序列化器.py

class SnippetSerializer(serializers.ModelSerializer):
  class Meta:
    model = Snippet
    fields = ('id', 'title', 'code', 'linenos', 'language', 'style', 'owner')
    owner = serializers.ReadOnlyField(source='owner.username')

Answer 1

在序列化器中，您将字段定义为类的属性，而不是在 Meta 中。试试这个:

class SnippetSerializer(serializers.ModelSerializer):
  owner = serializers.ReadOnlyField(source='owner.username')
  class Meta:
    model = Snippet
    fields = ('id', 'title', 'code', 'linenos', 'language', 'style', 'owner')