When `WP_Term` was introduced in [34997], the `$taxonomy` parameter for
`get_term()` was made optional. This meant that, when the optional param was
omitted, `get_term()` had no way of determining which term was intended when
the term_id was shared between multiple taxonomies. As a (somewhat sneaky) way
of fixing things, `get_term()` split any shared terms it found. But this could
cause problems with developer expectations: it's not clear why requesting a
term should result in a database update, much less a potential change in the
ID of a term.
In place of this technique, this changeset introduces a number of changes that
make the handling of shared terms a bit less insane:
* When a taxonomy is provided to `get_term()`, and a cached term is found matching the term_id, make sure the taxonomy also matches before returning it.
* When a taxonomy is not provided, ensure that the term is not shared before adding it to the cache.
* When a term is shared between taxonomies and no taxonomy is provided, return a `WP_Error` rather than splitting the term.
* When a term is shared between taxonomies, only one of which is valid, return the term from that taxonomy.
Props boonebgorges, dlh.
Fixes#34533.
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`wp_ajax_add_term()` fetches a term using `get_term()`, and passes the term to
`WP_Ajax_Response`, which expects each of the term's properties to be scalar.
Having `$data` as a `stdClass` (meant to mimic `WP_User::data`, populated by
a `get_row()` database query) violated this expectation, causing fatal string
conversion errors. As a workaround, `$term->data` is converted so that it is
no longer an actual property of the term object, but is assembled only when
requested in the magic `__get()` method.
Fixes#34348.
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The data stored in the cache should be raw database query results, not
`WP_Term` objects (which may be modified by plugins, and may contain additional
properties that shouldn't be cached).
If term relationships caches were handled in `wp_get_object_terms()` - where
a database query takes place - it would be straightforward to cache raw data.
See #34239. Since, in fact, `get_the_terms()` caches the value it gets from
`wp_get_object_terms()`, we need a technique that allows us to get raw data
from a `WP_Term` object. Mirroring `WP_User`, we introduce a `data` property
on term objects, which `get_the_terms()` uses to fetch cacheable term info.
Fixes#34262.
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`get_term()` now returns a `WP_Term` object, instead of a `stdClass` object.
Cache support and sanitization filters for individual terms are now more
centralized. For example, `get_term_by()` is able to cast results of its query
to a `WP_Term` object by passing it through `get_term()`.
The `$taxonomy` parameter for `get_term()` is now optional, as terms ought to
be unique to a taxonomy (ie, shared terms no longer exist). In cases where
`get_term()` detects that the term matching the specified term_id is from the
wrong taxonomy, it checks to see if you've requested a shared term, and if so,
it splits the term. This is used only for fallback purposes.
The elimination of shared terms allows the caching strategy for terms to be
simplified. Individual terms are now cached in a single 'terms' bucket.
Props flixos90, boonebgorges, scribu, dipesh.kakadiya.
See #14162.
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Boone Gorges
Scott Taylor
Sergey Biryukov
John Blackbourn