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使用 cached 缓存视图

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使用 cached 缓存视图 是 CoddyKit 上的免费 Flask Academy 课时。这是第 2 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 Flask Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Flask 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。

Caching Whole Responses

Some pages cost real work to build. The cached decorator stores the entire response, so repeat visitors get an instant copy.

Apply the Decorator

You add @cache.cached() right above your view function. The first request runs it; later ones replay the stored result.

@app.route("/report")
@cache.cached()
def report():
    return build_report()

Order of Decorators

Stacking matters. Put @app.route on top and @cache.cached below it, so routing happens before caching kicks in.

Set a Per-View Timeout

You can override the global setting per view. The timeout argument says how many seconds this specific response stays fresh.

@cache.cached(timeout=60)
def report():
    ...

Cached by Request Path

By default the cache key is the request path. So /report and /report/extra are stored as separate, independent entries.

Query Strings Are Ignored

Watch out: the default key skips the query string. So /list?page=2 and /list?page=3 would share one cached entry.

Vary on the Full URL

To split by query string, set query_string=True. Now each unique URL, parameters included, gets its own cached response.

@cache.cached(query_string=True)
def listing():
    ...

Custom Cache Keys

Need full control? Pass a make_cache_key function that builds the key yourself, for example mixing in the current user.

@cache.cached(make_cache_key=my_key)

Only Cache Safe Methods

Cache GET requests, never POST. Caching a write would replay an old body and skip the side effects users expect.

Skip the Cache When Needed

Return unless a condition holds and the view runs fresh every time. Handy to bypass caching for logged-in users.

@cache.cached(unless=lambda: g.user)

First Hit vs Later Hits

The first request is a cache miss and does the work. Every later request within the timeout is a fast cache hit.

Quick Check

Your list page uses ?page= but every page shows the same cached content.

Recap: View Caching

You learned to wrap views with @cache.cached, tune the timeout, key on the full URL, and skip caching for writes. 🚀

常见问题解答

「使用 cached 缓存视图」课时是免费的吗？

是的 — 「使用 cached 缓存视图」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 Flask Academy 课程的其余内容，请升级到 CoddyKit PRO。 Flask Academy 课程共包含 4 节课。

「使用 cached 缓存视图」这节课中我会学到什么？

按 URL 记忆化完整响应你通过在浏览器中直接运行的动手代码来练习 Flask 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 Flask Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Flask 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 2 节课，共 4 节。

「使用 cached 缓存视图」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 Flask Academy 课中编写并运行代码吗？

能。每节 Flask 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。

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