id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
29562	An idea for improving the template fragment cache	HongWeipeng	nobody	"There is a problem in using template fragment caching, that is, we need transfer `data` for template every time, even the data has been in cache.

If the data acquisition process is time consuming (such as 3 seconds), template caching has no helpful.

My idea is to allow provide a callback function to tell the cache how to get the data. and only call the function when cache expires.

I have tried it many times and found out how to make the simplest changes to complete this feature and ensure its compatibility.

Can you see this RP please? [https://github.com/django/django/pull/10176]"	New feature	new	Core (Cache system)	dev	Normal				Unreviewed	0	0	0	0	0	0