Python Django for loop未在网页上显示我的项目

我在我的网页上有一个表，我想迭代产品信息，直到我尝试添加一个分页器。服务器运行正常，网站的其余部分正常运行

这是我的档案：

shop/products.html

{% extends 'base.html' %}

{% block content %}
<h1>On sale here</h1>
<div class="col-sm-3">
    <h4>Categories</h4>
    <ul class="list-group">
        <a href="{% url 'products' %}" class="list-group-item"> All Categories </a>
        {% for c in countcat %} 
            <a href="{{ c.get_absolute_url }}" class="list-group-item catheight">{{c.name}}     
                    <span class="badge">{{c.num_products}}</span> 
            </a> 
        {% endfor %}
    </ul>
</div>
<div class="col-sm-9">
    <h4>Note that all products are second hand, unless otherwise stated.</h4>
    <form class="form-inline my-2 my-lg-0" action="{% url 'search_result' %}" method="get">
        {% csrf_token %}
        <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search" name="q">
        <button class="glyphicon glyphicon-search h-100" type="submit"></button>
    </form>
    <table class="table table-bordered table-hover table-condensed">
        <thead>
            <!-- The header row-->
            <tr>
                <th>ID</th>
                <th>Name</th>
                <th>Image</th>
                <th>Category</th>
                <th>Description</th>
                <th>Stock</th>
                <th>Price</th>
                <th>Buy</th>
            </tr>
        </thead>
        <tbody>
            <!-- Product row(s) -->
            {% for product in products %}
            <tr>
                <td>{{product.id}}</td>
                <td>{{product.name}}</td>
                {% if product.image %}
                    <td><img src="{{product.image.url}}"></td>
                {% endif %}
                <td>{{product.category}}</td>
                <td>{{product.description}}</td>
                <td>{{product.stock}}</td>
                <td>&euro;{{product.price}}</td>
                {% if product.stock > 0 %}
                <td><a href="{% url 'add_cart' product.id %}" class="btn btn-default btn-xs"><span
                    class="glyphicon glyphicon-shopping-cart"></span></a></td>
                {% else %}
                <td><a href="" class="btn btn-default btn-xs"><span
                    class="glyphicon glyphicon-warning-sign red"></span></a></td>
                {% endif %}
            </tr>
            {% endfor %}
        </tbody>

    </table>
    <hr>
        <div class="text-center">
            {% for pg in products.paginator.page_range %}
                <a href="?page={{pg}}" class="btn btn-light btn-sm
                    {% if products.number == pg %}
                        active
                    {% endif %}">{{pg}}</a>
            {% endfor %}
        </div>
</div>
{% endblock content %}

shop/url.py

from django.urls import path
from . import views 


urlpatterns = [
    path('', views.product_list,
            name='products'),
    path('<int:category_id>/', views.product_list,
            name='product_list_by_category'),
]

---

我有点像django noob，因此非常感谢您的帮助，谢谢：）

您在这里向Paginator传递字符串：

paginator = Paginator('products', 3)

您应该传递一个对象列表：

paginator = Paginator(products, 3)

paginator = Paginator('products', 3)

paginator = Paginator(products, 3)