/api/img 处的 IntegrityError/"author_id" 列中的空值违反了非空约束

Question

django rest framework post请求错误这是图像模型

class Img(models.Model):
    created_at=models.DateTimeField(auto_now_add=True)
    author=models.ForeignKey(User,on_delete=models.CASCADE,related_name="img")
    picture=models.ImageField(upload_to='fake_picture',null=True,blank=True)
    tags = TaggableManager(blank=True)

这是模型 Img 的图像序列化程序

class ImgSerializer(serializers.ModelSerializer):
    tags = TagListSerializerField(required=False)
    author = serializers.StringRelatedField(read_only=True)
    # post   = serializers.StringRelatedField(read_only=True)
    class Meta:
        model=Img
        fields='__all__'

views.py

class ImgViewSet(viewsets.ModelViewSet):
    parser_class = (FileUploadParser,)
    permission_classes =[IsAuthenticatedOrReadOnly,IsAuthorOrReadOnly]
    authentication_classes =(TokenAuthentication,JSONWebTokenAuthentication)
    queryset = Img.objects.all()
    serializer_class=ImgSerializer

但是当 post 请求到那个特定的 api 端点时，从 post 人触发了键值对为

picture:image.jpg

这就是响应

IntegrityError at /api/img/
null value in column "author_id" violates not-null constraint
DETAIL:  Failing row contains (4, fake_picture/2019-06-27_at_10-04-59.png, 2020-05-05 23:06:00.16071+00, null).


Request Method: POST
Request URL: http://localhost:8000/api/img/

Answer 1

请试试这个

class ImgViewSet(viewsets.ModelViewSet):
    ..........
    serializer_class=ImgSerializer
    .......
    def perform_create(self, serializer):
       serializer.save(author=serializer.context['request'].user)

/api/img 处的 IntegrityError/"author_id" 列中的空值违反了非空约束

IntegrityError at /api/img/ null value in column "author_id" violates not-null constraint

django

django-models

django-authentication

django-serializer

django-rest-framework