[development] Object Caching in DRUPAL-7?

Nathaniel Catchpole catch56 at googlemail.com
Thu Feb 26 04:28:42 UTC 2009

In the node_load() caching patch we've added a hook_nodeapi_post_load()
which is uncached - so poll implements hook_nodeapi_load() to get the
options in there, and hook_nodeapi_post_load() to get user-specific

There may well be a use case for a field_attach equivalent which does the
same thing. Field already has a cache though, so if we're caching objects
persistently there'd actually be no change on this specific point.


On Wed, Feb 25, 2009 at 8:58 PM, Josh Koenig <josh at chapterthree.com> wrote:

> > There is the issue of distinguishing cacheable and non-cacheable fields.
> > Does D7 Fields API flag fields as cacheable to make this simpler?
> Off the top of my head, it would somewhat defeat the purpose of
> object-caching to try and handle this on the per-field basis. You'd
> really need field-level caching then, which is an order of magnitude
> more in complexity (if not more).
> That said, I'm not sure what a "non cacheable" field would be like,
> unless it was some kind of php computed value, which seems like an
> edge case. Am I mistaking your meaning here? In mose cases, the field
> values should only change when the object itself is updated, at which
> point the cache would be invalidated anyway, and the next load would
> be fresh.
> This does break down if there's a computed value in a field. The most
> basic example I can think of is a node with PHP content for the body.
> Maybe something that displays the current time. As it stands, I
> believe Drupal's page caching system grabs the output of that PHP and
> stores it for anonymous users, meaning they'll get out-of-date
> computations.
> That's potentially a big deal if you're talking about object-level
> caching for logged-in users, so perhaps we would treat nodes like this
> as "uncacheable."
> Anyway, let me know if I'm way off here.
> I'll also be checking up on Nedjo's patch, as that definitely seems
> like the right architectural solution for drupal 7 core.
> cheers
> -j
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