在django中添加Review模型后，我收到了一个错误。。。在管理页面上创建了模型，但在我的网站上它不起作用。我不知道哪里出了问题。。。请引导我
base.html 第28行出现错误
它还显示了views.py第21行上的错误
视图.py
from django.shortcuts import render, redirect
from django.http import HttpResponse
from .models import *
from .forms import *
# Create your views here.
def home(request):
allbooks= book.objects.all()
context= {
"books": allbooks,
}
return render(request,'main/index.html',context) #error line
def detail (request,id):
bk=book.objects.filter(id=id)
reviews=Review.objects.filter(book=id)
context ={
"book":bk,
"reviews":reviews
}
return render (request,'main/details.html',context)
def addBooks(request):
if request.user.is_authenticated:
if request.user.is_superuser:
if request.method== "POST":
form=BookForm (request.POST or None)
if form.is_valid():
data=form.save(commit=False)
data.save()
return redirect("main:home")
else:
form=BookForm()
return render (request, 'main/addbooks.html',{"form":form,"controller":"Add Books"})
else:
return redirect("main:home")
else:
return redirect("accounts:login")
def editBooks(request,id):
if request.user.is_authenticated:
if request.user.is_superuser:
bk=book.objects.get(id=id)
if request.method== "POST":
form=BookForm (request.POST or None,instance=bk)
if form.is_valid():
data=form.save(commit=False)
data.save()
return redirect("main:detail",id)
else:
form=BookForm(instance=bk)
return render (request, 'main/addbooks.html',{"form":form,"controller":"Edit Books"})
else:
return redirect("main:home")
else:
return redirect("accounts:login")
def deleteBooks(request,id):
if request.user.is_authenticated:
if request.user.is_superuser:
bk=book.objects.get(id=id)
bk.delete()
return redirect("main:home")
else:
return redirect("main:home")
else:
return redirect("accounts:login")
def add_review(request,id):
if request.user.is_authenticated:
bk=book.objects.get(id=id)
if request.method == "POST":
form= ReviewForm(request.POST or None)
if form.is_valid():
data=form.save(commit=False)
data.comment=request.POST["comment"]
data.rating=request.POST["rating"]
data.user=request.user
data.book=bk
data.save()
return redirect("main:detail",id)
else:
form=ReviewForm()
return render(request,'main/details.html',{"form":form})
else:
return redirect("accounts:login")
base.html
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="{%url 'main:home'%}">Home<span class="sr-only">(current)</span></a> <!--error line-->
</li>
{% if request.user.is_authenticated %}
{% if request.user.is_superuser %}
<li class="nav-item">
<a class="nav-link" href="{% url 'main:add_books'%}">Add Books</a>
</li>
{% endif %}
{% endif %}
details.html
<div class="card">
<div class="card-body">
<h3 class="text-center">Reviews</h3>
<form action="{%url 'main:add_review' book.id%}"method="POST">
{% csrf_token %}
<label for="comment">Review</label>
<textarea name="comment" id="comment" cols="30" rows="5" class="form-control"></textarea>
<label for="rating">Rating</label>
<input type="text" name="rating" class="form-control">
<br>
<input type="submit" class="btn btn-danger" value="Add Review">
</form>
</div>
</div>
<div class="card">
<div class="card-body">
<ul>
{% for review in reviews %}
<li>{{review.comment}} <i>{{review.user}}</i></li>
{% endfor %}
</ul>
</div>
</div>
型号.py
class Review(models.Model):
book=models.ForeignKey(book,on_delete=models.CASCADE)
user=models.ForeignKey(User,on_delete=models.CASCADE)
comment=models.TextField(max_length=10000)
rating=models.FloatField(default=0)
def __str__(self):
return self.user.username
问题就在这里：
def detail(request,id):
bk=book.objects.filter(id=id)
filter()将返回一个图书查询集。您想要获取实际的书籍，因此请使用get()：
def detail(request,id):
bk=book.objects.get(id=id)
这应该可以解决错误，但如果数据库中不存在具有该id的图书，则会出现BookDoesNotExist异常。您可以使用get_object_or_404来处理此问题：
from django.shortcuts import get_object_or_404
def detail(request,id):
bk=get_object_or_404(book, id=id)
...