Django中url的逆向解析 -> Reverse resolution of URLs

• template文件: 用url模板标签
• python代码中可以使用django.core.urlresolvers.reverse()
• 其他get_absolute_url()

    <nav id="site-nav">
        {% for name in cat_all %}
            <a name="{{ name }}" href="{% url ‘list_category‘ name %}"
               class="{% if name == cat_now %}active{% endif %}">{{ name|capfirst }}</a>
        {% endfor %}
    </nav>

url(r‘^category/(?P<cat_name>\w+)/page/(?P<page_num>\d+)/$‘, ‘category‘, name=‘page‘)

        {% if posts.object_list and posts.paginator.num_pages > 1 %}
            <footer>
                {% if posts.has_previous %}
                    <a href="{% url ‘page‘ cat_now posts.previous_page_number %}"><</a>
                {% endif %}
                <span>
                    {{ posts.number }} of {{ posts.paginator.num_pages }}
                </span>
                {% if posts.has_next %}
                    <a href="{% url ‘page‘ cat_now posts.next_page_number %}">></a>
                {% endif %}
            </footer>
        {% endif %}

from django.shortcuts import render
from django.core.paginator import Paginator, InvalidPage, EmptyPage
from blog.models import Post, Category


def category(request, cat_name, page_num=1):
    if cat_name.lower() == ‘home‘:
        posts = Post.objects.all().order_by(‘-date‘)
    else:
        posts = Post.objects.all().filter(category__name=cat_name).order_by(‘-date‘)

    paginator = Paginator(posts, 3)
    try:
        page = int(page_num)
    except ValueError:
        page = 1

    try:
        posts = paginator.page(page)
    except (InvalidPage, EmptyPage):
        posts = paginator.page(paginator.num_pages)

    return render(request, ‘blog/index.html‘,
                  {
                      ‘posts‘: posts,
                      ‘cat_now‘: cat_name,
                      ‘cat_all‘: map(lambda cat: cat.name, Category.objects.all())
                  })