Django 分页 "That page contains no results"

Question

我想使用 django 分页。第一页能够加载产品，但最后一页没有显示它们。

这是我的索引 View :

def index(request):

    categories = Category.objects.filter(parent_category=None)

    product_list = Product.objects.filter(is_deleted=False).order_by('created_at')
    paginator = Paginator(product_list, 1) # Show 25 contacts per page
    page = request.GET.get("page",1)

    try:
        products = paginator.page(page)
    except PageNotAnInteger:
        products = paginator.page(1)
    except EmptyPage:
        products = paginator.page(1)

    context = {
        'products': products,
        'categories': categories
    }
    return render(request, 'product/urunler.html', context)

这是我的模板:

<div class="blog-pagination">
    <ul class="flat-pagination style1">
        {% if products.has_previous %}
            <li class="prev">
                <a href="?page={{products.previous_page_number}}" title="">
                    <img src="{% static 'images/icons/left-1.png' %}" alt="">Önceki Sayfa
                </a>
            </li>
        {% else %}
            <li class="prev">
                <a href="#" title="">
                    <img src="{% static 'images/icons/left-1.png' %}" alt="">Önceki Sayfa
                </a>
            </li>
        {% endif %}
        {% for i in products.paginator.page_range %}
            {% if products.number == i %}
                <li class="active">
                    <a href="?page={{i}}" class="waves-effect" title="">{{i}}</a>
                </li>
            {% else %}
                <li>
                    <a href="?page={{i}}" class="waves-effect" title="">{{i}}</a>
                </li>
            {% endif %}
        {% endfor %}
        {% if products.has_previous %}
            <li class="next">
                <a href="?page={{products.next_page_number}}" title="">
                    Sonraki Sayfa
                    <img src="{% static 'images/icons/right-1.png' %}" alt="">
                </a>
            </li>
        {% else %}
        {% if products.has_next %}
            <li class="next">
                    <a href="" title="">
                        Sonraki Sayfa
                        <img src="{% static 'images/icons/right-1.png' %}" alt="">
                    </a>
            </li>
        {% endif %}                                                           
        {% endif %}                           
    </ul>
    <div class="clearfix"></div>
</div>

我的数据库中有 2 个产品我可以显示第一页，但最后一页没有显示在这里是回溯:

Traceback (most recent call last):
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py", line 41, in inner
ecommerce_1            |     response = get_response(request)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 187, in _get_response
ecommerce_1            |     response = self.process_exception_by_middleware(e, request)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 185, in _get_response
ecommerce_1            |     response = wrapped_callback(request, *callback_args, **callback_kwargs)
ecommerce_1            |   File "/ecommerce/Product/views.py", line 22, in index
ecommerce_1            |     return render(request, 'product/urunler.html', context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/shortcuts.py", line 30, in render
ecommerce_1            |     content = loader.render_to_string(template_name, context, request, using=using)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/loader.py", line 68, in render_to_string
ecommerce_1            |     return template.render(context, request)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/backends/django.py", line 66, in render
ecommerce_1            |     return self.template.render(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 207, in render
ecommerce_1            |     return self._render(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 199, in _render
ecommerce_1            |     return self.nodelist.render(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 990, in render
ecommerce_1            |     bit = node.render_annotated(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 957, in render_annotated
ecommerce_1            |     return self.render(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/loader_tags.py", line 177, in render
ecommerce_1            |     return compiled_parent._render(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 199, in _render
ecommerce_1            |     return self.nodelist.render(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 990, in render
ecommerce_1            |     bit = node.render_annotated(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 957, in render_annotated
ecommerce_1            |     return self.render(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/loader_tags.py", line 72, in render
ecommerce_1            |     result = block.nodelist.render(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 990, in render
ecommerce_1            |     bit = node.render_annotated(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 957, in render_annotated
ecommerce_1            |     return self.render(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/defaulttags.py", line 322, in render
ecommerce_1            |     return nodelist.render(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 990, in render
ecommerce_1            |     bit = node.render_annotated(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 957, in render_annotated
ecommerce_1            |     return self.render(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 1040, in render
ecommerce_1            |     output = self.filter_expression.resolve(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 708, in resolve
ecommerce_1            |     obj = self.var.resolve(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 849, in resolve
ecommerce_1            |     value = self._resolve_lookup(context)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/template/base.py", line 911, in _resolve_lookup
ecommerce_1            |     current = current()
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/core/paginator.py", line 158, in next_page_number
ecommerce_1            |     return self.paginator.validate_number(self.number + 1)
ecommerce_1            |   File "/usr/local/lib/python3.6/site-packages/django/core/paginator.py", line 50, in validate_number
ecommerce_1            |     raise EmptyPage(_('That page contains no results'))

第一页没有错误，但最后一页总是有错误。

Answer 1

您正在查看 has_previous但随后包括 next_page_number .看起来您想包含 previous_page_number反而:

{% if products.has_previous %}
    <a href="?page={{products.previous_page_number}}" title="">Previous</a>
{% endif %}