Question

我制作了一个简单的API，使用Django Rest Framework列出了他们所深爱的大学的学生。列出数据的URL为http://127.0.0.1:8000/api/v1/students/。试用了API后，出现以下错误

TypeError at /api/v1/students/
'type' object is not iterable

Internal Server Error: /api/v1/students/
Traceback (most recent call last):
  File "/Users/gilangramadhanilhami/Desktop/88sparses/shipment/tracking/lib/python3.6/site-packages/django/core/handlers/exception.py", line 35, in inner
    response = get_response(request)
  File "/Users/gilangramadhanilhami/Desktop/88sparses/shipment/tracking/lib/python3.6/site-packages/django/core/handlers/base.py", line 128, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/Users/gilangramadhanilhami/Desktop/88sparses/shipment/tracking/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/gilangramadhanilhami/Desktop/88sparses/shipment/tracking/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/Users/gilangramadhanilhami/Desktop/88sparses/shipment/tracking/lib/python3.6/site-packages/django/views/generic/base.py", line 69, in view
    return self.dispatch(request, *args, **kwargs)
  File "/Users/gilangramadhanilhami/Desktop/88sparses/shipment/tracking/lib/python3.6/site-packages/rest_framework/views.py", line 477, in dispatch
    request = self.initialize_request(request, *args, **kwargs)
  File "/Users/gilangramadhanilhami/Desktop/88sparses/shipment/tracking/lib/python3.6/site-packages/rest_framework/views.py", line 379, in initialize_request
    authenticators=self.get_authenticators(),
  File "/Users/gilangramadhanilhami/Desktop/88sparses/shipment/tracking/lib/python3.6/site-packages/rest_framework/views.py", line 273, in get_authenticators
    return [auth() for auth in self.authentication_classes]
TypeError: 'type' object is not iterable

我能够在StackOverflow上找到一些解决方案，但是运气不好。我正在APIView文件中使用views.py，我想了解为什么在我使用APIView时会发生这种情况（使用Viewset也会出现此问题）。

我尝试更改权限更改没有帮助。同样将many=True设置为“ False”也不能解决问题。

有人有什么想法吗？预先感谢。

以下是其他文件，可以帮助您更好地了解此问题

models.py

from django.db import models

class University(models.Model):
    name = models.CharField(max_length=50)
    url = models.URLField(unique=True)

    class Meta:
        verbose_name = "University"
        verbose_name_plural = "Universities"

    def __str__(self):
        return self.name

class Student(models.Model):
    first_name = models.CharField(max_length=50)
    last_name = models.CharField(max_length=50)
    university = models.ForeignKey(University, on_delete=models.CASCADE,)

    class Meta:
        verbose_name = "Student"
        verbose_name_plural = "Students"


    def __str__(self):
        return '%s %s' % (self.first_name, self.last_name)

serializers.py

from rest_framework import serializers

from . import models

class StudentSerializer(serializers.ModelSerializer):
    class Meta:
        fields = (
            'id',
            'first_name',
            'last_name',
            'university'
        )
        model = models.Student

class UniversitySerializer(serializers.ModelSerializer):
    class Meta:
        fields = (
            'id',
            'name',
            'url'
        )
        model = models.University

views.py

from rest_framework.views import APIView
from rest_framework.response import Response

from . import models
from . import serializers

class ListStudent(APIView):
    def list(self, request, format=None):
        students = models.Student.objects.all()
        serializer = serializers.StudentSerializer(students, many=True)
        return Response(serializer.data)

students / urls.py

from django.urls import path

from . import views

urlpatterns = [
    path('', views.ListStudent.as_view(), name='student_list')
]

urls.py

from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('api-auth/', include('rest_framework.urls', namespace='rest_framework')),
    path('api/v1/students/', include(('students.urls','students'), namespace='students')),
]

Answer 1

我认为这是一个小错误。我的'DEFAULT_AUTHENTICATION_CLASSES'看起来像这样

REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': (
        'rest_framework.authentication.SessionAuthentication'

    ),
    'DEFAULT_PERMISSION_CLASSES': (
        'rest_framework.permissions.IsAuthenticatedOrReadOnly'
    ),
}

我在这里缺少的是一个简单的,。应该是这样的

REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': (
        'rest_framework.authentication.SessionAuthentication',

    ),
    'DEFAULT_PERMISSION_CLASSES': (
        'rest_framework.permissions.IsAuthenticatedOrReadOnly',
    ),
}

我意识到“可迭代”一词的含义。希望这会有所帮助。

Django“类型”对象不可迭代

1 个答案: