Django实现Web应用显示单个主题时出现错误： 'function' object has no attribute 'entry_set'

1。 实现显示单个主题时，点击单个主题出现以下错误

'function' object has no attribute 'entry_set'

Request Method: GET

Request URL: http://localhost:8000/topics/(%3FP1%5Cd+)/

Django Version: 2.1.4

Exception Type: AttributeError

Exception Value: 'function' object has no attribute 'entry_set'

Exception Location: D:\Python_env\learning_log\learning_logs\views.py in topic, line 22

Python Executable: D:\Python_env\learning_log\11_env\Scripts\python.exe

1. 源代码如下

from django.shortcuts import render
from .models import Topic

# Create your views here.

def index(request):
    return render(request, 'learning_logs/index.html')


def topics(request):
    # 显示所有的主题
    topics = Topic.objects.order_by('date_added')
    context = {'topics': topics}
    return render(request, 'learning_logs/topics.html', context)


def topic(request, topic_id):
    """显示单个主题及其所有的条目"""
    topic = Topic.objects.get(id = topic_id)
    entries = topic.entry_set.order_by('-date_added')
    context = {'topic': topic, 'entries': entries}
    return render(request, 'learning_logs/topic.html', context)

好像问题是出在entries = topic.entry_set.order_by('-date_added')
entry_set没有定义吗？

topic没有entry_set这个属性，建议调试下面函数中的entries
def topic(request, topic_id):
"""显示单个主题及其所有的条目"""
topic = Topic.objects.get(id = topic_id)
entries = topic.entry_set.order_by('-date_added')
context = {'topic': topic, 'entries': entries}
return render(request, 'learning_logs/topic.html', context)

entry_set其中的entry是指你用models创建的一张表，如果我没猜错的话你再models里并没有定义class entry():

你检查一下，leanring_logs\urls.py文件的URL映射配置对了没有。
"""定义learning_logs的URL模式"""
from . import views
from django.urls import path

app_name = 'learning_logs'
urlpatterns = [
# 主页
path(r'',views.index, name = 'index'),

# 主题列表页面（显示所有的主题）
path(r'topics/',views.topics, name ='topics'),

# 特定主题的详细页面
path(r'topics/<int:topic_id>/',views.topic, name ='topic'),

]