Django Academy · 课时

模板片段缓存

只缓存页面中开销较大的部分

模板片段缓存 是 CoddyKit 上的免费 Django Academy 课时。这是第 3 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Django Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Django Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Cache Just One Piece

Often only part of a page is slow. Fragment caching lets you cache that one block while the rest renders fresh each time.

Load the cache Tag

Fragment caching lives in a template tag library, so start your template with load cache to make it available.

{% load cache %}

The cache Block

Wrap the slow markup in a cache block. Django renders it once, stores the HTML, and reuses it on later requests.

{% cache 500 sidebar %}
  ...expensive sidebar...
{% endcache %}

Timeout Comes First

The first argument is the timeout in seconds. After it expires, the next render rebuilds the fragment and caches it again.

Name Your Fragment

The second argument is a fragment name. Django combines it with extra arguments to form the unique cache key.

Vary the Fragment

Add variables after the name so a fragment can vary per user or object, caching one copy for each distinct value.

{% cache 500 sidebar request.user.id %}
  ...per-user sidebar...
{% endcache %}

Each Variation Is Separate

Every combination of the vary arguments gets its own key, so user 1 and user 2 each see their own cached copy.

Use a Specific Cache

Point a fragment at a named cache with using when you keep page fragments separate from other cached data.

{% cache 500 sidebar using="fragments" %}

Great for Shared Widgets

Fragment caching shines for shared widgets like a navbar or a top-posts list that look the same for many visitors.

Keep Live Parts Outside

Leave anything that must stay current, like a greeting with the user's name, outside the cache block so it never goes stale.

Less Effort Than View Caching

Fragment caching is the middle ground: more precise than caching a whole view, yet far simpler than caching every query by hand.

Quick Check

Let's check how a fragment stays unique per user.

Recap

You can now load cache, wrap a fragment in a cache block with a timeout and name, and vary it per user for precise speedups. ✨

常见问题解答

「模板片段缓存」课时是免费的吗？

是的 — 「模板片段缓存」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Django Academy 课程的其余内容，请升级到 CoddyKit PRO。 Django Academy 课程共包含 4 节课。

「模板片段缓存」这节课中我会学到什么？

只缓存页面中开销较大的部分你通过在浏览器中直接运行的动手代码来练习 Django Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Django Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Django Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 3 节课，共 4 节。

「模板片段缓存」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Django Academy 课中编写并运行代码吗？

能。每节 Django Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

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