如何获取特定帖子的评论数？

任务是这样的： Django 2.2 有一个已创建的帖子，并且该帖子有评论，您需要“拉出”评论总数并在模板中显示。好吧，因此，有必要使用每个新评论更新此计数器。

这是代码： models.py

class Post(models.Model):
    ...

    comments = models.ForeignKey(
        'Comments', on_delete=models.CASCADE,
        blank=True, default='',
        related_name='post',
        verbose_name='Комментарии'
    )

    ...


class Comments(models.Model):
    author = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        blank=True, default='',
        on_delete=models.DO_NOTHING,
        verbose_name='Автор: '
    )

    content = models.TextField(
        'Комментарий',
        blank=True,
        default=''
    )

    like = models.PositiveIntegerField(
        'Лайк',
        default=0,
        blank=True
    )

    dislike = models.PositiveIntegerField(
        'Дизлайки',
        default=0,
        blank=True
    )

    date_pub = models.DateTimeField(
        'Дата публикации',
        auto_now=True
    )

    def __str__(self):
        return f'Автор: {self.author}, Дата публикации: {self.date_pub}'

视图.py

from django.shortcuts import render
from .models import Post


def index_page(request):
    posts = Post.objects.all()
    context = {
        'posts': posts,
    }
    return render(request, 'news/index.html', context)

样本

{% block content %}
<div class="container">
    {% for post in posts %}
    <div class="card">
        <div class="card-header">
            {{ post.author }}
            <br>
            {{ post.date_pub }}
            <br>
            <br>
            <small>
                Просмотры: <span class="badge">{{ post.view_counter }}</span> |
                Комментарии: <span class="badge">{{ post.comments }}</span>
            </small>
        </div>
        <div class="card-body">
            <h5 class="card-title">{{ post.title }}</h5>
            <p class="card-text">{{ post.content|truncatewords:20 }}</p>
            <div class="mb-3">
                {% if user.is_authenticate %}
                <button type="button" class="btn btn-info btn-sm">
                    Нравится <span class="badge badge-light">{{ post.like }}</span>
                </button>
                <button type="button" class="btn btn-danger btn-sm">
                    Не нравится <span class="badge badge-light">{{ post.dislike }}</span>
                </button>
                {% else %}
                <button type="button" class="btn btn-info btn-sm" disabled>
                    Нравится <span class="badge badge-light">{{ post.like }}</span>
                </button>
                <button type="button" class="btn btn-danger btn-sm" disabled>
                    Не нравится <span class="badge badge-light">{{ post.dislike }}</span>
                </button>
                {% endif %}
            </div>
            <a href="#" class="btn btn-primary">Читать!</a>
        </div>
    </div>
    {% endfor %}
</div>
{% endblock %}

预期结果：

谢谢你。