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.
Built from https://develop.svn.wordpress.org/trunk@36566
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Instead of returning a value for each of the related table column lengths, return an array of all of the column lengths used in the comment form.
Better fallback handling, where each field falls back to the expected max_length instead of an arbitrary number.
Props azaozz.
Fixes#10377.
Built from https://develop.svn.wordpress.org/trunk@36514
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When a comment is removed from the object cache, the `clean_comment_cache` action is now fired. This provides plugin and theme developers a chance to perform secondary cache invalidation as needed.
Props spacedmonkey.
Fixes#35610.
Built from https://develop.svn.wordpress.org/trunk@36405
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Added hardcoded maxlength attributes on the author, author_email, author_url, and comment_field input markup. These can be modified via the comment_form_defaults filter. Added logic in wp_handle_comment_submission() to return a WP_Error when the comment_author, comment_author_url, or comment_content values exceed the max length of their columns. Introduces wp_get_comment_column_max_length() which returns the max column length for a given column name, and is filterable. Unit tests included for the error conditions in wp_handle_comment_submission()
Fixes#10377.
Props westonruter rachelbaker.
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In `wp_update_comment()` only check if the given `comment_post_ID` is valid if it isn’t `0`. This allows comments that were created programmatically via `wp_insert_comment()` without the (optional) `comment_post_ID` parameter to be edited.
Props subharanjan for the initial patch.
Fixes#34954
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* Takes inspiration from `WP_Post` and adds sanity to comment caching.
* Clarifies when the current global value for `$comment` is returned. The current implementation in `get_comment()` introduces side effects and an occasion stale global value for `$comment` when comment caches are cleaned.
* Strongly-types `@param` docs
* This class is marked `final` for now
Props wonderboymusic, nacin.
See #32619.
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[31467] included a change that involved generating meta_query SQL before the
`pre_get_comments` hook, with the result that `pre_get_comments` callbacks were
no longer able to modify comment meta queries. We fix the problem by moving the
SQL generation to after the hook.
This changeset also includes a second call to `meta_query->parse_query_vars()`,
to ensure that modifications to metadata-related query vars (such as `meta_key`
and `meta_value`) performed in `pre_get_comments` callbacks have the expected
effect on the comment query.
Fixes#32762.
Built from https://develop.svn.wordpress.org/trunk@32911
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* Introduce a `__construct()` method, which can accept an array of query vars.
* Move query logic out of `query()` method and into a new `get_comments()` method.
* Ensure that `$this->comments` is set whenever `get_comments()` returns a value.
* Introduce a `parse_query()` method, where query vars are parsed with default values and the 'parse_comment_query' action is fired.
These changes bring `WP_Comment_Query` syntax closer to that of `WP_Query`.
Props westonruter, morganestes, boonebgorges.
Fixes#24826.
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