[django]使用 Paginator 实现分页功能

from django.core.paginator import Paginator
from django.core.paginator import EmptyPage
from django.core.paginator import PageNotAnInteger
from hello.models import Topic


def index(request):
    limit = 3  # 每页显示的记录数
    topics = Topic.objects.all()
    paginator = Paginator(topics, limit)  # 实例化一个分页对象

    page = request.GET.get('page')  # 获取页码
    try:
        topics = paginator.page(page)  # 获取某页对应的记录
    except PageNotAnInteger:  # 如果页码不是个整数
        topics = paginator.page(1)  # 取第一页的记录
    except EmptyPage:  # 如果页码太大，没有相应的记录
        topics = paginator.page(paginator.num_pages)  # 取最后一页的记录

    return render_to_response('index.html', {'topics': topics})

{% for topic in topics.object_list %}
  <p>{{ topic.title }}</p>
{% endfor %}

<!-- 第一种分页显示方式 -->
<p>
  {# topics.paginator.page_range 这个函数返回包含一个所有页码数的 range 对象 #}
  {# 即 range(1, topics.paginator.num_pages + 1) #}
  {% for page_number in topics.paginator.page_range %}
    {% ifequal page_number  topics.number %}
      {{ page_number }}
    {% else %}
      <a href="?page={{ page_number }}">{{ page_number }}</a>
    {% endifequal %}
  {% endfor %}
</p>


<!-- 另一种分页显示方式 -->
<p>
{% if topics.has_previous %}
  <a href="?page={{ topics.previous_page_number }}">Previous</a>
  {% endif %}
  {# topics.paginator.number_pages 返回总页数 #}
  Page {{ topics.number }} of {{ topics.paginator.num_pages }}.
{% if topics.has_next %}
  <a href="?page={{ topics.next_page_number }}">Next</a>
{% endif %}
</p>