Problem/Motivation

CacheableMetadata is a tricky class for two reasons.
One, because figuring out what to add to it and when to add it can vary wildly in implementation.
Two, because there are not really any docs for it.

It was something I learned through finding and reading other usages of it within core.

Proposed resolution

Write examples of how to use it within the class docs.
Consider a more lengthy explanation on https://www.drupal.org/docs/8/api/render-api/cacheability-of-render-arrays

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet

Comments

tim.plunkett created an issue. See original summary.

xjm’s picture

xjm
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Title: Expand documentation of CacheableMetadata to give usage examples » Expand documentation of CacheableMetadata and RefinableCacheableDependencyInterface to give usage examples
Related issues: +#2561773: CacheableMetadata is misnamed, +#2705819: Remove core's parameter typehints of CacheableMetadata within interfaces and base classes

In #2976148: Layout-based entity rendering should delegate to the correct section storage instead of hardcoding to either defaults or overrides we switched the typehint to RefinableCacheableDependencyInterface which has a more helpful name and at least a paragraph of documentation; however, that interface doesn't (and shouldn't) cover what you need to do with the CacheableMetadata objects (constructing them and using applyTo() which doesn't exist on this interface. So the docs on both will need work.

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