如何根据登录的用户限制ManyToMany字段中的选择？

from django.db import models
from django.contrib.auth.models import User

class Product(models.Model):
    name = models.CharField(max_length=100)
    allowed_users = models.ManyToManyField(User)

from django.shortcuts import render
from django.contrib.auth.decorators import login_required

@login_required
def product_detail(request, product_id):
    product = Product.objects.get(id=product_id)
    
    # 检查当前登录用户是否在allowed_users中
    if request.user in product.allowed_users.all():
        # 用户被允许访问该产品
        return render(request, 'product_detail.html', {'product': product})
    else:
        # 用户没有权限访问该产品
        return render(request, 'access_denied.html')

{% if user in product.allowed_users.all %}
    <!-- 显示产品内容 -->
{% else %}
    <!-- 显示无权限提示 -->
{% endif %}