Python 使用带有序列化程序的 Django Rest Framework 时出现 AttributeError
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/28760356/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
AttributeError while using Django Rest Framework with serializers
提问by Frankline
I am following a tutorial located herethat uses Django Rest Framework, and I keep getting a weird error about a field.
我正在关注位于此处的使用Django Rest Framework的教程，但我不断收到有关字段的奇怪错误。
I have the following model in my models.py
我有以下模型 models.py
from django.db import models
class Task(models.Model):
completed = models.BooleanField(default=False)
title = models.CharField(max_length=100)
description = models.TextField()
Then my serializer in serializers.py
然后我的序列化器 serializers.py
from rest_framework import serializers
from task.models import Task
class TaskSerializer(serializers.ModelSerializer):
class Meta:
model = Task
fields = ('title', 'description', 'completed')
and my views.pyas follows:
和我的views.py如下：
from rest_framework import status
from rest_framework.decorators import api_view
from rest_framework.response import Response
from task.models import Task
from api.serializers import TaskSerializer
@api_view(['GET', 'POST'])
def task_list(request):
"""
List all tasks, or create a new task
"""
if request.method == 'GET':
tasks = Task.objects.all()
serializer = TaskSerializer(tasks)
return Response(serializer.data)
elif request.method == 'POST':
serializer = TaskSerializer(data=request.DATA)
if serializer.is_valid():
serializer.save()
return Response(serializer.data, status=status.HTTP_201_CREATED)
else:
return Response(
serializer.errors, status=status.HTTP_400_BAD_REQUEST
)
and my urls.py has this line:
我的 urls.py 有这一行：
url(r'^tasks/$', 'task_list', name='task_list'),
When I try accessing curl http://localhost:9000/api/tasks/, I keep getting the following error and I'm not sure what to make of it:
当我尝试访问时curl http://localhost:9000/api/tasks/，我不断收到以下错误，我不知道该怎么做：
AttributeError at /api/tasks/
Got AttributeError when attempting to get a value for field `title` on serializer `TaskSerializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `QuerySet` instance.
Original exception text was: 'QuerySet' object has no attribute 'title'.
What I'm I missing?
我错过了什么？
采纳答案by Ashwini Chaudhary
Simple specify many=Truewhen creating a serializer from queryset, TaskSerializer(tasks)will work only with one instance of Task:
many=True从查询集创建序列化程序时简单指定，TaskSerializer(tasks)仅适用于以下的一个实例Task：
tasks = Task.objects.all()
serializer = TaskSerializer(tasks, many=True)
回答by Rodney Hawkins
The problem here is that you are trying to convert a Queryset(list) of entries into a single entry. The solution is something along these lines.
这里的问题是您试图将条目的查询集（列表）转换为单个条目。解决方案是沿着这些路线的。
from rest_framework import serializers
class TaskListSerializer(serializers.ListSerializer):
child = TaskSerializer()
allow_null = True
many = True
Then
然后
if request.method == 'GET':
tasks = Task.objects.all()
serializer = TaskListSerializer(tasks)
return Response(serializer.data)
