django-rest-framwork:AttributeError，“响应"对象没有属性“标题" [英] django-rest-framwork: AttributeError, 'Response' object has no attribute 'title'

问题描述

AttributeError::尝试在序列化器 QuestionSerializer 上获取字段 title 的值时，出现AttributeError.序列化程序字段的名称可能不正确，并且与 Response 实例上的任何属性或键都不匹配.原始异常文本为:响应"对象没有属性标题".

AttributeError: Got AttributeError when attempting to get a value for field title on serializer QuestionSerializer. The serializer field might be named incorrectly and not match any attribute or key on the Response instance. Original exception text was: 'Response' object has no attribute 'title'.

models.py

class Question(models.Model):
    title = models.TextField(null=False,blank=False)
    status = models.CharField(default='inactive',max_length=10)
    created_by = models.ForeignKey(User,null=True,blank=True,on_delete=models.SET_NULL)

    def __str__(self):
        return self.title

    class Meta:
        ordering = ('id',)

urls.py

urlpatterns = [
    path('poll/<int:id>/', PollDetailsAPIView.as_view()),
]

serializers.py

class QuestionSerializer(serializers.ModelSerializer):
    class Meta:
        model = Question
        fields =[
            'id',
            'title',
            'status',
            'created_by'
        ]

views.py

class PollDetailsAPIView(APIView):
    
    def get_object(self, id):
        try:
            return Question.objects.get(id=id)
        except Question.DoesNotExist:
            return Response({"error": "Question does not exist"}, status=status.HTTP_404_NOT_FOUND)
    
    def get(self, request, id):
        question = self.get_object(id)
        serializer = QuestionSerializer(question)
        return Response(serializer.data)

关于邮递员，我试图获取一个不存在的id，而不是得到此响应"error":问题不存在" 和一个 Error:404 ，我不断收到错误500内部服务器错误.

on postman, i am trying to get an id that doesnt exist but instead of getting this response "error": "Question does not exist" and an Error: 404, i keep getting error 500 Internal server error.

推荐答案

当您尝试获取不存在的对象时，您的 get_object 方法将返回 Response 然后传递给序列化器.由于无法序列化 Response ，因此会引发 AttributeError .您应该做的是在 except 之外的 Http404 中引发错误:

When you are trying to get non existing object, your get_object method returns a Response, which is then passed to the serializer. Since it cannot serialize Response, it raises an AttributeError. What you should do is either raising an Http404 error in except:

def get_object(self, id):
    try:
        return Question.objects.get(id=id)
    except Question.DoesNotExist:
        raise Http404('Not found')

或使用Django快捷方式 get_object_or_404 :

or use django shortcut get_object_or_404:

from django.shortcuts import get_object_or_404


class PollDetailsAPIView(APIView):
    def get(self, request, id):
        question = get_object_or_404(Question, id=id)
        serializer = QuestionSerializer(question)
        return Response(serializer.data)

这篇关于django-rest-framwork:AttributeError，“响应"对象没有属性“标题"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！