Like 按钮正在工作，但在 django 中没有更改为 Like

Question

我已经尝试与我的专家编码员一起调试此问题一天，但我们无法在此处确定问题。点赞按钮可以正常工作，我可以查询总点赞数，但 Clap 按钮不会更改为不喜欢，我们不确定原因。我相信错误在于 html 行：

{% if liked and post.slug == blog_post.slug %} Unlike {% else %} Like {% endif %}

或 django 行：

context["liked"] = True if blog_post.likes.filter(id=request.user.id).exists() else False

非常感谢您能在此处发现问题！

views.py

def home_feed_view(request, *args, **kwargs):
    context = {}
    blog_posts = BlogPost.objects.all()
    context['blog_posts'] = blog_posts 
    if request.method=="POST":
        slug=request.POST["submit_slug"]
        blog_post = get_object_or_404(BlogPost, slug=slug)
        context['blog_post'] = blog_post
        context["liked"] = True if blog_post.likes.filter(id=request.user.id).exists() else False
        context['total_likes'] = blog_post.total_likes()
    type_of_post = TypeofPostFilter(request.GET, queryset=BlogPost.objects.all())
    context['type_of_post'] = type_of_post

    paginated_type_of_post = Paginator(type_of_post.qs, 13 )
    page = request.GET.get('page')
    post_page_obj = paginated_type_of_post.get_page(page)

    context['post_page_obj'] = post_page_obj

    return render(request, "HomeFeed/snippets/home.html", context)


def LikeView(request, slug):
    context = {}
    user = request.user
    if not user.is_authenticated:
        return redirect('must_authenticate')
    post = get_object_or_404(BlogPost, slug=slug)
    liked = False
    if post.likes.filter(id=request.user.id).exists():
        post.likes.remove(request.user)
        liked = False
    else:
        post.likes.add(request.user)
        liked = True
    return redirect(request.META.get('HTTP_REFERER', ''))

<td class="table-primary">
   <form action="{% url 'HomeFeed:like_post' post.slug %}" method="POST"> 
       {% csrf_token %} 
              
       <button type="submit" name="submit_slug" value="{{ post.slug }}" class='btn btn-primary btn-sm'>

       {% if liked and post.slug == blog_post.slug %} Unlike {% else %} Like 
       {% endif %}

       </button> 
       {{ post.total_likes }} Clap {{ post.total_likes|pluralize }}
         
   </form>
</td> 

urls.py

path('<slug>/like/', LikeView, name='like_post'),

models.py

class BlogPost(models.Model):
    chief_title = models.CharField(max_length=50, null=False, blank=False)
    body = models.TextField(max_length=5000, null=False, blank=False)
    likes = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name='blog_posts', blank=True)
    author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    slug = models.SlugField(blank=True, unique=True)

Answer 1

好的，这里有一个更简单的方法来检查一个模型是否存在于另一个模型的 m2m 字段中：

html

{% if request.user in blog_post.likes.all %} Unlike {% else %} Like {% endif %}

查看

if request.user in blog_post.likes.all():

PS 在您的模型中，您应该将字段 likes 重命名为 likers，因为它与 User 模型而不是 Like 模型的关系:)

编辑

因此，要在您想在模板中执行此操作的单个页面上轻松显示帖子列表及其相应的按钮：

views.py

def posts(request): 
    blog_posts = BlogPost.objects.all()
    return render(request, 'index.html', {'blog_posts': blog_posts})

index.html

{% for post in blog_posts %}

    <h1>{{ post.chief_title }}</h1>
    <p>{{ post.author }} says: </p>
    <b>{{ post.body }}</b>
    <p> This post is liked by: </p>
    {% for user in post.likes %}
        <p>{{ user.username }}</p>
    {% endfor %}
    
    {% if request.user not in post.likes.all %} 
        <a href="{% url 'like_post' post.slug %}">Like</a>
    {% else %} 
        <a href="{% url 'like_post' post.slug %}">Unlike</a>
    {% endif %}

{% endfor %}