erf django restframework 在尝试获取序列化程序"SoftwareSerializer"上的字段"image_id"的值时出现属性错误(状态代码 406)

Question

我在尝试打开端点时遇到此错误(http://127.0.0.1:8000/api/metrics/)我正在使用django restamework(drf(，软件和类别enpoints运行良好，但度量端点给出了以下错误：

错误

{
"message": "Got AttributeError when attempting to get a value for field `image_id` on serializer `SoftwareSerializer`.nThe serializer field might be named incorrectly and not match any attribute or key on the `Category` instance.nOriginal exception text was: 'Category' object has no attribute 'image'.",
"code": null,
"status_code": 406
}

型号

class Category(models.Model):
name = models.CharField(max_length=256, blank=True)
created_datetime = models.DateTimeField(auto_now_add=True, verbose_name="تاریخ ایجاد ")
update_datetime  = models.DateTimeField(auto_now=True, verbose_name="تاریخ بروزرسانی ")
def __str__(self):
return self.name
class Metric(models.Model):
title = models.CharField(max_length=254)
categorymetric = models.ForeignKey("main.Category",on_delete=models.SET_NULL,null=True)
def __str__(self):
return self.title
class Software(models.Model):
software_name   = models.CharField(max_length=150, default="software_name", null=False, verbose_name="اسم نرم افزار")
created_datetime = models.DateTimeField(auto_now_add=True, verbose_name="تاریخ ایجاد ")
update_datetime  = models.DateTimeField(auto_now=True, verbose_name="تاریخ بروزرسانی ")
image            = models.ForeignKey("main.Image", on_delete=models.SET_NULL, blank=True, null=True)
created_by       = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE, null=True)

class Meta:
verbose_name = "software"
verbose_name_plural = "softwares"
def __str__(self) :
return self.software_name

视图

class CategoryViewSet(ModelViewSet):
serializer_class = CategorySerializer
pagination_class = None
queryset = Category.objects.all()
class SoftwareViewSet(ModelViewSet):
serializer_class = SoftwareSerializer
pagination_class = None
queryset = Software.objects.all()
permission_classes = ( IsAuthenticated, )

def perform_create(self, serializer):
serializer.save(created_by=self.request.user)
class MetricViewSet(ModelViewSet):
serializer_class = MetricSerializer
pagination_class = None
queryset = Metric.objects.all()

序列化程序

class MetricSerializer(serializers.ModelSerializer):
categorymetric = SoftwareSerializer(read_only=True)
categorymetric_id = serializers.PrimaryKeyRelatedField(queryset=Category.objects.all(), source='Categorymetric')
class Meta:
model = Metric
fields = ['id', 'title', 'categorymetric','categorymetric_id']
class CategorySerializer(serializers.ModelSerializer):
class Meta :
model =Category
fields = ['id','name','created_datetime','update_datetime']
class SoftwareSerializer(serializers.ModelSerializer):
image = ImageSerializer(read_only=True)
image_id = serializers.PrimaryKeyRelatedField(queryset=Image.objects.all(), source='image')

class Meta:
model = Software
fields = ['id', 'software_name','created_datetime','update_datetime','image','image_id', 'created_by']
depth = 1

我找了很多，但都找不到解决方案，有人知道解决方案是什么吗？提前感谢

Answer 1

您为categorymetric使用了错误的序列化程序。

代替

class MetricSerializer(serializers.ModelSerializer):
categorymetric = SoftwareSerializer(read_only=True)

应该是

class MetricSerializer(serializers.ModelSerializer):
categorymetric = CategorySerializer(read_only=True)