如何通过 Django Rest Framework 上传图像？

Question

这是我的模型，包含ImageField：

class Profile(models.Model):
    user = models.OneToOneField(User)

    new_article_notifications_enabled = models.BooleanField(default=False)
    new_comment_notifications_enabled = models.BooleanField(default=False)
    new_comment_answer_notifications_enabled = models.BooleanField(default=False)

    userpic = models.ImageField(upload_to='userpics/', blank=True, null=True)
    city = models.PositiveSmallIntegerField(choices=CITY_CHOICES, default=CITY_CHOICES[0][0])
    webpage = models.URLField(blank=True)
    about_me = models.TextField(blank=True)
    favorite_brands = models.TextField(blank=True)

序列化器：

class ProfileChangeSerializer(serializers.ModelSerializer):
    class Meta:
        model = Profile
        fields = [
            'new_article_notifications_enabled',
            'new_comment_notifications_enabled',
            'new_comment_answer_notifications_enabled',
            'userpic',
            'city',
            'webpage',
            'about_me',
            'favorite_brands',
        ]

    def update(self, instance, validated_data):
        Profile.objects.filter(id=instance.pk).update(**validated_data)
        return instance

查看：

class ProfileChangeAPIView(generics.RetrieveAPIView,
                           mixins.DestroyModelMixin,
                           mixins.UpdateModelMixin):
    permission_classes = (
        permissions.IsAuthenticated,
    )
    serializer_class = ProfileChangeSerializer
    parser_classes = (MultiPartParser, FormParser,)

    def get_object(self):
        if not Profile.objects.filter(user__id=self.request.user.pk).exists():
            return Profile.objects.create(user=self.request.user)
        return self.request.user.profile

    def put(self, request, *args, **kwargs):
        return self.update(request, *args, **kwargs)

所以，当我尝试通过 Django Rest Framework 界面上传用户图片时 - 它会更新指向图像的超链接，但不会在 media 文件夹中创建图像文件。当我通过 django 管理界面上传图片时，一切正常。我哪里错了？

Answer 1

我认为您不需要重写 Serializer update 方法。您可以在 View 中简单地覆盖 put，如下所示：

def put(self, request, *args, **kwargs):
        serializer = ProfileChangeSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

顺便问一下，你是如何从前端发送图像数据的？我希望您使用 jquery FormData，如 https://stackoverflow.com/a/32426562/2578846