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Comments: Don't do direct SQL query when fetching decendants. 

The SQL query was built using the clauses compiled when querying for
top-level comments. But in cases where the top-level comment query
results are already in the cache, the SQL clauses are not built, and
so are unavailable for `fill_descendants()`. Instead, we call
`get_comments()`, using modified versions of the parameters passed
to the main `WP_Comment_Query` class.

Props Akeif, Rarst for testing.
Fixes #37696.

git-svn-id: https://develop.svn.wordpress.org/trunk@38446 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Boone Gorges 2016-08-30 14:48:00 +00:00
parent f80068e75b
commit 2fc4e48d07
2 changed files with 59 additions and 2 deletions
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12
src/wp-includes/class-wp-comment-query.php
View File

@ -990,8 +990,16 @@ class WP_Comment_Query {
}
if ( $uncached_parent_ids ) {
$where = 'WHERE ' . $_where . ' AND comment_parent IN (' . implode( ',', array_map( 'intval', $uncached_parent_ids ) ) . ')';
$level_comments = $this->db->get_results( "SELECT {$this->db->comments}.comment_ID, {$this->db->comments}.comment_parent {$this->sql_clauses['from']} {$where} {$this->sql_clauses['groupby']} ORDER BY comment_date_gmt ASC, comment_ID ASC" );
// Fetch this level of comments.
$parent_query_args = $this->query_vars;
foreach ( $exclude_keys as $exclude_key ) {
$parent_query_args[ $exclude_key ] = '';
}
$parent_query_args['parent__in'] = $uncached_parent_ids;
$parent_query_args['no_found_rows'] = true;
$parent_query_args['hierarchical'] = false;
$level_comments = get_comments( $parent_query_args );
// Cache parent-child relationships.
$parent_map = array_fill_keys( $uncached_parent_ids, array() );

49
tests/phpunit/tests/comment/query.php
View File

@ -2494,6 +2494,55 @@ class Tests_Comment_Query extends WP_UnitTestCase {
$this->assertSame( $num_queries, $wpdb->num_queries );
}
/**
* @ticket 37696
*/
public function test_hierarchy_should_be_filled_when_cache_is_incomplete() {
global $wpdb;
$p = self::factory()->post->create();
$comment_1 = self::factory()->comment->create( array(
'comment_post_ID' => $p,
'comment_approved' => '1',
) );
$comment_2 = self::factory()->comment->create( array(
'comment_post_ID' => $p,
'comment_approved' => '1',
'comment_parent' => $comment_1,
) );
$comment_3 = self::factory()->comment->create( array(
'comment_post_ID' => $p,
'comment_approved' => '1',
'comment_parent' => $comment_1,
) );
$comment_4 = self::factory()->comment->create( array(
'comment_post_ID' => $p,
'comment_approved' => '1',
'comment_parent' => $comment_2,
) );
// Prime cache.
$q1 = new WP_Comment_Query( array(
'post_id' => $p,
'hierarchical' => true,
) );
$q1_ids = wp_list_pluck( $q1->comments, 'comment_ID' );
$this->assertEqualSets( array( $comment_1, $comment_2, $comment_3, $comment_4 ), $q1_ids );
// Delete one of the parent caches.
$last_changed = wp_cache_get( 'last_changed', 'comment' );
$key = md5( serialize( wp_array_slice_assoc( $q1->query_vars, array_keys( $q1->query_var_defaults ) ) ) );
$cache_key = "get_comment_child_ids:$comment_2:$key:$last_changed";
wp_cache_delete( $cache_key, 'comment' );
$q2 = new WP_Comment_Query( array(
'post_id' => $p,
'hierarchical' => true,
) );
$q2_ids = wp_list_pluck( $q2->comments, 'comment_ID' );
$this->assertEqualSets( $q1_ids, $q2_ids );
}
/**
* @ticket 27571
*/