django休息框架错误需要一个字段

Question

我一直在关注http://www.django-rest-framework.org/tutorial/4-authentication-and-permissions/的教程（这是非常好的），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/ code =“print 789”

它给了我一个错误：

HTTP / 1.1 400错误请求允许：GET，POST，HEAD，OPTIONS内容长度：37内容类型：application / json日期：2018年2月28日星期三18:29:15 GMT服务器：WSGIServer / 0.2 CPython / 3.6.3变化：接受，Cookie X-Frame选项：SAMEORIGIN

{“owner”：[“此字段为必填项。” ]}

对于我创建的所有用户，可浏览api提供选项的所有者字段也可见。保存它（浏览器或命令行）时，它会保存发出请求的用户，以便部件正确。我认为它不应该在可浏览的api上可见，并且在api调用中不需要它，因为它从请求中找出它。

这是我的代码：

views.朋友:

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)

models.朋友:

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)

serialize认识.朋友

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

Answer 1

在序列化程序中，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')

Answer 2

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

    def perform_create(self, serializer):
        serializer.validated_data['owner'] = self.request.user
        serializer.save()

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

您必须在序列化程序验证的数据中分配值。