根据状态更改按钮

Question

我正在尝试向我的网站添加喜欢的帖子系统。我已经具有喜欢和不喜欢帖子的功能，但是我无法在模板中更改按钮值。

models.py 类Post（models.Model）：

file = models.FileField(upload_to='files/')
summary = models.TextField(max_length=600)
pub_date = models.DateTimeField(auto_now=True)
user = models.ForeignKey(User, on_delete=models.CASCADE)
likes = models.ManyToManyField(User, related_name='likes')
is_liked = models.BooleanField(default=False)

views.py

def likepost(request, pk):
    if request.method == 'POST':
        user = request.user
        post = get_object_or_404(Post, pk=pk)
        if post.likes.filter(id=user.id).exists():
            post.is_liked = True
            post.likes.remove(user)
        else:
            post.is_liked = False
            post.likes.add(user)
        return redirect('home')

home.html

{% if post.is_liked == True %}
                      <a href="javascript:{document.getElementById('like__post').submit()}"><button class="btn btn-primary btn-lg btn-block"><span class="oi oi-caret-top"></span> Like {{ post.total_likes }}</button></a>
              {% else %}
                    <a href="javascript:{document.getElementById('like__post').submit()}"><button class="btn btn-primary btn-lg btn-block"><span class="oi oi-caret-top"></span> Unlike {{ post.total_likes }} </button></a>
              {% endif %}

        <form id="like__post" method="POST" action="{% url 'likepost' post.id %}">
                {% csrf_token%}
                <input type="hidden">
              </form>