- Wagtail 是一个用 Python 编写的开源 CMS，基于 Django 框架构建。 它优雅、强大、敏捷，专注于灵活性和用户体验，为开发人员提供一个快速有吸引力的界面，可以直观地创建和组织内容。
- Wagtail 教程系列 记录了基于 Wagtail 搭建博客站点的整个过程，当前站点 所呈现的即是搭建过程的最新效果。
安装 django-redis
pip install django-redis配置 Django Cache Setting
CACHES = {
'default': {
'BACKEND': 'django_redis.cache.RedisCache',
'LOCATION': '127.0.0.1:6379',
'OPTIONS': {
'CLIENT_CLASS': 'django_redis.client.DefaultClient',
}
}
}缓存模板页面
可以对整个模板页面缓存：
{% cache 691200 blog_index request.get_full_path request.preview_timestamp %}
<!-- 691200 = 8 days. The next 2 arguments make sure the fragment
is cached for a specific URL (there are index pages for each tag and category)
and can be identified in the cache table easily. The last argument is to allow wagtail page previews -->
<!DOCTYPE html>
<html lang="zh_cn">
...
</html>
{% endcache %}也可以对模板页面局部缓存：
<!-- blog index page template example -->
{% extends "base.html" %}
{% load blog_tags cache %}
{% block content %}
{% cache 691200 blog_index request.get_full_path request.preview_timestamp %}
<!-- 691200 = 8 days. The next 2 arguments make sure the fragment
is cached for a specific URL (there are index pages for each tag and category)
and can be identified in the cache table easily. The last argument is to allow wagtail page previews -->
{% include 'spotlight_hero.html' %}
{% category_menu_strip category %}
<section>
<div class="container">
<div class="row">
<div class="col-sm-12">
{% for rl in self.related_links.all %}
<!-- NOTE: this is where the queryset is evaluated, so this database hit will be cached -->
<p>{{ rl.title }}: <a href='{{ rl.link_page.url }}'>{{ rl.link_page }}</a></p>
{% endfor %}
<div class="row">
{% for blog in blogs %}
{% include 'blog/blog_post.html' %}
{% endfor %}
</div>
</div>
</div>
</div>
</section>
{% endcache %}
{% endblock %}预览Wagtail 实时页面效果
我们在预览时向缓存签名添加时间戳，以便我们实际看到预览而不是相同URL的缓存：
# Add this to each of your page models to over ride their serve_preview method
class MyPage(Page):
# your other class stuff here
def serve_preview(self, request, mode_name):
request.preview_timestamp = datetime.now()
return super(MyPage, self).serve_preview(request, mode_name)缓存刷新(创建/删除)
用编码方式来访问所有需要刷新的页面以自动创建缓存，重建缓存时需要先删除缓存：
# in my /slowread/slowread/utils.py
# I will want to use this in a management command as well as a view
import requests
from wagtail.core.models import Page
from django.core.cache import cache
def request_all_pages():
try:
# 访问 / 主页
print("访问 主页 http://localhost")
requests.get("http://localhost")
# 访问 /blog
print("访问 博客列表页 http://localhost/blog")
requests.get("http://localhost/blog")
# 访问 /blog/*
page = Page.objects.get(title="文章列表")
blogpages = page.get_children().live().order_by('-first_published_at')
for blogpage in blogpages:
print("访问 文章 " + blogpage.full_url)
requests.get(blogpage.full_url)
# 访问 /wallpaper
print("访问 博客列表页 http://localhost/wallpaper")
requests.get("http://localhost/wallpaper")
except Exception as e:
print("Unexpected Error: {}".format(e))
# 默认情况下，Django的模板缓存使用名为“template.chache.”前缀键名
def clear_page_cache():
# just clears all template fragment caches
try:
cache.delete_pattern("template.cache.*")
print("Page Cache deleted...")
except Exception as e:
print("Unexpected Error: {}".format(e))将“刷新缓存”加入 Wagtail 设置菜单
# Create your views here.
# in /slowread/slowread/blog/views.py
from django.shortcuts import render
from django.contrib import messages
from django.shortcuts import redirect
from django.contrib.auth.decorators import login_required
from slowread.utils import request_all_pages, clear_page_cache
@login_required()
def RefreshPageCache(r):
try:
clear_page_cache()
request_all_pages()
messages.success(r, 'Page Cache has been refreshed!')
except Exception as e:
messages.error(r, e )
return redirect('/admin/')# in /slowread/slowread/blog/wagtail_hooks.py
from wagtail.admin.menu import MenuItem
from wagtail.core import hooks
@hooks.register('register_settings_menu_item')
def register_refresh_cache_menu_item():
return MenuItem('刷新缓存', '/blog/refresh-cache', classnames='icon icon-folder-inverse', order=1)修改 /slowread/urls.py ，增加 刷新缓存 url:
from django.urls import path
from slowread.blog.views import RefreshPageCache
urlpatterns = [
...
# 刷新 缓存
path('blog/refresh-cache/', RefreshPageCache, name='refresh cache'),
...
]