The process of lazy-loading can be resource intensive for object that have
terms in large numbers of taxonomies and are running a persistent object cache.
This new parameter allows the feature to be disabled in these cases.
Props DBrumbaugh10Up.
See #36953.
git-svn-id: https://develop.svn.wordpress.org/trunk@37589 602fd350-edb4-49c9-b593-d223f7449a82
Comment and term meta lazyloading for `WP_Query` loops, introduced in 4.4,
depended on filter callback methods belonging to `WP_Query` objects. This meant
storing `WP_Query` objects in the `$wp_filter` global (via `add_filter()`),
requiring that PHP retain the objects in memory, even when the local variables
would typically be expunged during normal garbage collection. In cases where a
large number of `WP_Query` objects were instantiated on a single pageload,
and/or where the contents of the `WP_Query` objects were quite large, serious
performance issues could result.
We skirt this problem by moving metadata lazyloading out of `WP_Query`. The
new `WP_Metadata_Lazyloader` class acts as a lazyload queue. Query instances
register items whose metadata should be lazyloaded - such as post terms, or
comments - and a `WP_Metadata_Lazyloader` method will intercept comment and
term meta requests to perform the cache priming. Since `WP_Metadata_Lazyloader`
instances are far smaller than `WP_Query` (containing only object IDs), and
clean up after themselves far better than the previous `WP_Query` methods (bp
only running their callbacks a single time for a given set of queued objects),
the resource use is decreased dramatically.
See [36525] for an earlier step in this direction.
Props lpawlik, stevegrunwell, boonebgorges.
Fixes#35816.
git-svn-id: https://develop.svn.wordpress.org/trunk@36566 602fd350-edb4-49c9-b593-d223f7449a82
`add_term_meta()` and `update_term_meta()` identify terms by `$term_id`. In
cases where a term is shared between taxonomies, `$term_id` is insufficient to
distinguish where the metadata belongs.
When attempting to add/update termmeta on a shared term, a `WP_Error` object
is returned. This gives developers enough information to decide whether they'd
like to force the term to be split and retry the save, or show an error in the
UI, or whatever.
Props boonebgorges, mboynes, DH-Shredder, jorbin, aaroncampbell.
Fixes#34544.
git-svn-id: https://develop.svn.wordpress.org/trunk@35515 602fd350-edb4-49c9-b593-d223f7449a82
Using more than one instance of `WP_UnitTest_Factory` causes all kinds of craziness, due to out-of-sync internal generator sequences. Since we want to use `setUpBeforeClass`, we were creating ad hoc instances. To avoid that, we were injecting one `static` instance via Dependency Injection in `wpSetUpBeforeClass`. All tests should really use the `static` instance, so we will remove the instance prop `$factory`.
Replace `$this->factory` with `self::$factory` over 2000 times.
Rewrite all of the tests that were hard-coding dynamic values.
#YOLOFriday
git-svn-id: https://develop.svn.wordpress.org/trunk@35225 602fd350-edb4-49c9-b593-d223f7449a82
By default, `WP_Query` will not cache query results when using a persistent
object cache. The lazyload tests, however, depend on the cache being set during
each `WP_Query`, because the object cache is cleared between tests.
See #31491.
git-svn-id: https://develop.svn.wordpress.org/trunk@35112 602fd350-edb4-49c9-b593-d223f7449a82
[34529] introduced lazyloading for the metadata belonging to terms matching
posts in the main `WP_Query`. The current changeset improves this technique
in the following ways:
* Term meta lazyloading is now performed on the results of all `WP_Query` queries, not just the main query.
* Fewer global variable touches and greater encapsulation.
* The logic for looping through posts to identify terms is now only performed once per `WP_Query`.
Props dlh, boonebgorges.
See #34047.
git-svn-id: https://develop.svn.wordpress.org/trunk@34704 602fd350-edb4-49c9-b593-d223f7449a82
The 'last_changed' incrementor is used to invalidate the `get_terms()` query
cache. Since `get_terms()` queries may reference 'meta_query', changing term
metadata could change the results of the queries. So we invalidate the cache
on add, delete, and update.
See #10142.
git-svn-id: https://develop.svn.wordpress.org/trunk@34538 602fd350-edb4-49c9-b593-d223f7449a82
Adds a new table to the database schema (`wp_termmeta`), and a set of
`*_term_meta()` API functions. `get_terms()` and `wp_get_object_terms()`
now also support 'meta_query' parameters, with syntax identical to other
uses of `WP_Meta_Query`.
When fetching terms via `get_terms()` or `wp_get_object_terms()`, metadata for
matched terms is preloaded into the cache by default. Disable this behavior
by setting the new `$update_term_meta_cache` paramater to `false`.
To maximize performance, within `WP_Query` loops, the termmeta cache is *not*
primed by default. Instead, we use a lazy-loading technique: metadata for all
terms belonging to posts in the loop is loaded into the cache the first time
that `get_term_meta()` is called within the loop.
Props boonebgorges, sirzooro.
See #10142.
git-svn-id: https://develop.svn.wordpress.org/trunk@34529 602fd350-edb4-49c9-b593-d223f7449a82
