python新手，求助个有关django的问题
django版本：2.1.5
python版本：3.6.0
问题如下：
项目路径\ learning_log
应用路径\learning_logs
\learning_log\urls代码：
from django.contrib import admin
from django.urls import path,include
urlpatterns = [
path('admin/', admin.site.urls),
path('',include('learning_logs.urls'))
]
\learning_logs.urls代码：
from django.urls import path
from . import views
app_name = 'learning_logs'
urlpatterns = [
path('',views.index,name='index'),
path('topics/',views.topics,name='topics'),
]
\learning_logs.views代码：
from django.shortcuts import render
from .models import Topic,Entry
def index(request):
return render(request,'learning_logs/index.html')
def topics(request):
a = Topic.object.order_by('date_added')
context = {'topics':a}
return render(request,'learning_logs/topics.html',context)
\learning_logs.models代码：
from django.db import models
class Topic(models.Model):
text = models.CharField(max_length=200)
date_added = models.DateTimeField(auto_now_add=True)
def __str__(self):
return self.text
class Entry(models.Model):
topic = models.ForeignKey(Topic,on_delete=models.CASCADE)
text = models.TextField()
date_added = models.DateTimeField(auto_now_add=True)
class Meta:
verbose_name_plural = 'entries'
def __str__(self):
if len(self.text) < 50:
return self.text
else:
return self.text[:50] + '...'
运行网页后：
http://127.0.0.1:8000/ 显示如下，正常
Learning Log - Topics
Learning Log helps you keep track of your learning, for any topic you're learning about.
运行 http://127.0.0.1:8000/Topic/ 后报错如下：
AttributeError at /topics/
type object 'Topic' has no attribute 'object'
