检查当前用户是不是投票

Posted 2023-02-26

【中文标题】检查当前用户是不是投票

【英文标题】：Check if current user has voted检查当前用户是否投票

【发布时间】：2012-04-08 06:22:55

【问题描述】：

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，因此我可以在当前用户已投票的 <li> 元素上设置一个类。

模板（sn-p）

% 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 (sn-p)

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 (sn-p)

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)

【参考方案1】：

首先，您的代码无法正确呈现，因为您将变量传递给视图中不存在的模板 - 我希望这只是一个错字。

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 %