Commit Graph

17 Commits

Author SHA1 Message Date
Boone Gorges
b2f253fc8e Prevent extra db queries in WP_Comment::get_children().
`WP_Comment_Query::fill_descendants()` queries for a comment tree in a way that
minimizes database overhead, and places the located descendants with their
proper parents. However, it doesn't touch leaf nodes - comments with no
children - so future calls to `get_children()` on those comment objects
result in unnecessary database queries. To prevent this, `fill_descendants()`
now sets a `populated_children` flag on all located `WP_Comment` objects.

See #8071.
Built from https://develop.svn.wordpress.org/trunk@34730


git-svn-id: http://core.svn.wordpress.org/trunk@34694 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-10-01 03:58:23 +00:00
Boone Gorges
9f36a943b5 Improve post field lazyloading for comments.
[34583] modified comment queries so that all post fields are no longer loaded
by default. Instead, they are loaded only when requested on individual comment
objects. This changeset improves that flow:

* `WP_Comment` magic methods `__isset()` and `__get()` should only load the post when a post field is being requested.
* The new `update_comment_post_cache` argument for `WP_Comment_Query` allows developers to specify that, when comments are queried, all of the posts matching those comments should be loaded into cache with a single DB hit. This parameter defaults to false, since typical comment queries are linked to a single post.

Fixes #27571.
Built from https://develop.svn.wordpress.org/trunk@34599


git-svn-id: http://core.svn.wordpress.org/trunk@34563 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-26 16:02:25 +00:00
Boone Gorges
18d6b3c8dc Force comment pagination on single posts.
Previously, the 'page_comments' toggle allowed users to disable comment
pagination. This toggle was only superficial, however. Even with
'page_comments' turned on, `comments_template()` loaded all of a post's
comments into memory, and passed them to `wp_list_comments()` and
`Walker_Comment`, the latter of which produced markup for only the
current page of comments. In other words, it was possible to enable
'page_comments', thereby showing only a subset of a post's comments on a given
page, but all comments continued to be loaded in the background. This technique
scaled poorly. Posts with hundreds or thousands of comments would load slowly,
or not at all, even when the 'comments_per_page' setting was set to a
reasonable number.

Recent changesets have addressed this problem through more efficient tree-
walking, better descendant caching, and more selective queries for top-level
post comments. The current changeset completes the project by addressing the
root issue: that loading a post causes all of its comments to be loaded too.

Here's the breakdown:

* Comment pagination is now forced. Setting 'page_comments' to false leads to evil things when you have many comments. If you want to avoid pagination, set 'comments_per_page' to something high.
* The 'page_comments' setting has been expunged from options-discussion.php, and from places in the codebase where it was referenced. For plugins relying on 'page_comments', we now force the value to `true` with a `pre_option` filter.
* `comments_template()` now queries for an appropriately small number of comments. Usually, this means the `comments_per_page` value.
* To preserve the current (odd) behavior for comment pagination links, some unholy hacks have been inserted into `comments_template()`. The ugliness is insulated in this function for backward compatibility and to minimize collateral damage. A side-effect is that, for certain settings of 'default_comments_page', up to 2x the value of `comments_per_page` might be fetched at a time.
* In support of these changes, a `$format` parameter has been added to `WP_Comment::get_children()`. This param allows you to request a flattened array of comment children, suitable for feeding into `Walker_Comment`.
* `WP_Query` loops are now informed about total available comment counts and comment pages by the `WP_Comment_Query` (`found_comments`, `max_num_pages`), instead of by `Walker_Comment`.

Aside from radical performance improvements in the case of a post with many
comments, this changeset fixes a bug that caused the first page of comments to
be partial (`found_comments` % `comments_per_page`), rather than the last, as
you'd expect.

Props boonebgorges, wonderboymusic.
Fixes #8071.
Built from https://develop.svn.wordpress.org/trunk@34561


git-svn-id: http://core.svn.wordpress.org/trunk@34525 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-25 20:40:25 +00:00
Boone Gorges
07dab62c98 Remove debug cruft, introduced in [34546].
Props ocean90.
See #8071.
Built from https://develop.svn.wordpress.org/trunk@34549


git-svn-id: http://core.svn.wordpress.org/trunk@34513 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-25 15:26:25 +00:00
Boone Gorges
d0185d4dde Normalize whitespace in WP_Comment_Query documentation.
Built from https://develop.svn.wordpress.org/trunk@34548


git-svn-id: http://core.svn.wordpress.org/trunk@34512 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-25 15:25:25 +00:00
Boone Gorges
fc854a837f Introduce hierarchical query support to WP_Comment_Query.
Comments can be threaded. Now your query can be threaded too! Bonus: it's
not totally insane.

* The new `$hierarchical` parameter for `WP_Comment_Query` accepts three values:
  * `false` - Default value, and equivalent to current behavior. No descendants are fetched for matched comments.
  * `'flat'` - `WP_Comment_Query` will fetch the descendant tree for each comment matched by the query paramaters, and append them to the flat array of comments returned. Use this when you have a separate routine for constructing the tree - for example, when passing a list of comments to a `Walker` object.
  * `'threaded'` - `WP_Comment_Query` will fetch the descendant tree for each comment, and return it in a tree structure located in the `children` property of the `WP_Comment` objects.
* `WP_Comment` now has a few utility methods for fetching the descendant tree (`get_children()`), fetching a single direct descendant comment (`get_child()`), and adding anothing `WP_Comment` object as a direct descendant (`add_child()`). Note that `add_child()` only modifies the comment object - it does not touch the database.

Props boonebgorges, wonderboymusic.
See #8071.
Built from https://develop.svn.wordpress.org/trunk@34546


git-svn-id: http://core.svn.wordpress.org/trunk@34510 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-25 15:13:24 +00:00
Boone Gorges
fea3051f54 Improve pagination internals in WP_Comment_Query.
`WP_Comment_Query` will now report the total number of comments matching the
query params (`comments_found`), as well as the total number of pages required
to display these comments (`max_num_pages`). Because `SQL_CALC_FOUND_ROWS`
queries can introduce a lot of overhead in some cases, we disable the feature
by default. Pass `no_found_rows=false` to `WP_Comment_Query` to enable the
count. (We use the negative parameter name 'no_found_rows' for parity with
`WP_Query`.)

Props wonderboymusic, boonebgorges.
See #8071.
Built from https://develop.svn.wordpress.org/trunk@34544


git-svn-id: http://core.svn.wordpress.org/trunk@34508 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-25 14:35:24 +00:00
Boone Gorges
4b467a2698 Store SQL clauses in WP_Comment_Query property.
This small syntax change paves the way for some improvements related to #8071.
Built from https://develop.svn.wordpress.org/trunk@34542


git-svn-id: http://core.svn.wordpress.org/trunk@34506 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-25 14:09:25 +00:00
Drew Jaynes
35977a06e7 Docs: The Comments subpackage is plural.
See #33701.

Built from https://develop.svn.wordpress.org/trunk@34411


git-svn-id: http://core.svn.wordpress.org/trunk@34375 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-22 13:45:26 +00:00
Drew Jaynes
8df8fb6046 Docs: The Comment API is singular.
See #33701.

Built from https://develop.svn.wordpress.org/trunk@34409


git-svn-id: http://core.svn.wordpress.org/trunk@34373 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-22 13:43:25 +00:00
Boone Gorges
c6c9f8ad26 Split the comment query.
`WP_Comment_Query` now fetches comments in two stages: (1) a query to get the
IDs of comments matching the query vars, and (2) a query to populate the
objects corresponding to the matched IDs. The two queries are cached
separately, so that sites with persistent object caches will continue to have
complete cache coverage for normal comment queries.

Splitting the query allows our cache strategy to be more modest and precise, as
full comment data is only stored once per comment. It also makes it possible
to introduce logic for paginated threading, which is necessary to address
certain performance problems.

See #8071.
data is only stored once per comment, instead of along with
Built from https://develop.svn.wordpress.org/trunk@34310


git-svn-id: http://core.svn.wordpress.org/trunk@34274 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-18 19:28:51 +00:00
Boone Gorges
bb43f72692 Prime comment meta caches in WP_Comment_Query.
The new 'update_comment_meta_cache' parameter, which defaults to `true`, can
be used to disable this behavior.

`update_comment_cache()` has been updated to support an `$update_meta_cache`
parameter, which also updates to true; this matches the pattern we use for
priming post caches.

See #16894.
Built from https://develop.svn.wordpress.org/trunk@34268


git-svn-id: http://core.svn.wordpress.org/trunk@34232 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-17 19:30:27 +00:00
Scott Taylor
f5edeb11d0 WP_Comment_Query: add comment__in to allowed values for $orderby.
Adds unit tests.

Fixes #33883.

Built from https://develop.svn.wordpress.org/trunk@34212


git-svn-id: http://core.svn.wordpress.org/trunk@34176 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-15 16:35:44 +00:00
Scott Taylor
72651400ba Add parent__in and parent__not_in query vars to WP_Comment_Query.
Adds unit tests.

Fixes #33882.

Built from https://develop.svn.wordpress.org/trunk@34205


git-svn-id: http://core.svn.wordpress.org/trunk@34169 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-15 16:23:39 +00:00
Drew Jaynes
a71ee9a0ea Docs: Add a missing file header for wp-includes/class-wp-comment-query.php, introduced in [33750].
Also clarifies the class DocBlock summary and tags for `WP_Comment_Query`.

See #33413. See #33701.

Built from https://develop.svn.wordpress.org/trunk@33898


git-svn-id: http://core.svn.wordpress.org/trunk@33867 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-04 01:38:24 +00:00
Scott Taylor
e73ee5ac98 Introduce WP_Comment class to model/strongly-type rows from the comments database table. Inclusion of this class is a pre-req for some more general comment cleanup and sanity.
* 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.

Built from https://develop.svn.wordpress.org/trunk@33891


git-svn-id: http://core.svn.wordpress.org/trunk@33860 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-03 18:17:24 +00:00
Scott Taylor
f07ab12359 Comments: move WP_Comment_Query into its own file. comment.php loads the new files, so this is 100% BC if someone is loading comment.php directly. New files created using svn cp.
Creates: 
`class-wp-comment-query.php` 
`comment-functions.php` 

`comment.php` contains only top-level code. Class file only contains the class. Functions file only contains functions.

See #33413.

Built from https://develop.svn.wordpress.org/trunk@33750


git-svn-id: http://core.svn.wordpress.org/trunk@33718 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-08-26 04:27:21 +00:00