python之检查当前用户是否投票

在我的索引页面上，我需要知道当前用户是否对一本书进行了投票，所以我可以在 <li> 上设置一个类当前用户已经投票的元素。

模板(片段)

{% if top_books %} 
<ul> 
    {% for book in top_books %} 
        <li id="{{ book.id }}" class="book"> 
                <img class="upvote {% ifequal thisUserUpVote 1 %}selected{% endifequal %}" title="Upvote book (click to undo)" src="{{ STATIC_URL }}images/upvote.png" /> 
                {{ book.score|floatformat }} 
                <img class="downvote {% ifequal thisUserDownVote 1 %}selected{% endifequal %}" title="Downvote book (click to undo)" src="{{ STATIC_URL }}images/downvote.png" /> 
            <a href="/p/{{ book.id }}/">{{ book.title }}</a> 
        </li> 
    {% endfor %} 
</ul> 

Views.py(片段)

from django.http import HttpResponse 
from django.shortcuts import render_to_response, get_object_or_404 
from django.template import RequestContext 
from books.models import Book 
 
def index(request): 
    latest_book = Book.objects.all().order_by('-pub_date')[:5] 
    top_items = Book.objects.all().order_by('-score')[:100] 
    return render_to_response('books/index.html', { 
                            'latest_books': latest_books, 
                            'top_books' : top_books}, 
                            context_instance=RequestContext(request)) 

Models.py(片段)

class Book(models.Model): 
    title = models.CharField(max_length=500) 
    pub_date = models.DateField() 
    author = models.ManyToManyField(Author) 
    userUpVotes = models.ManyToManyField(User, blank=True) 
    userDownVotes = models.ManyToManyField(User, blank=True) 

请您参考如下方法:

首先，您的代码将无法正确呈现，因为您将变量传递给 View 中不存在的模板 - 我希望这只是一个拼写错误。

def index(request): 
    latest_book = Book.objects.all().order_by('-pub_date')[:5] 
    top_items = Book.objects.all().order_by('-score')[:100] 
    return render_to_response('books/index.html', { 
                            'latest_books': latest_books, # latest_book 
                            'top_books' : top_books}, # top_items 
                            context_instance=RequestContext(request)) 

对于您的问题 - 您需要在模板的循环中检查模型的用户是 userUpVotes 还是 userDownVotes:

{% for book in top_books %} 
   {% if user in book.userupvotes.all %} 
       {{ user }} has upvoted 
   {% endif %} 
   {% if user in book.userdownvotes.all %} 
       {{ user }} has downvoted 
   {% endif %} 
{% endfor %}