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Fix various issues with WP_Adjacent_Post: 

* Performance / number of queries.
 * Incorrect results caused by sticky posts.
 * Back compat for filters, which had used "WHERE" while WP_Query does not; and fixing table references.

props ethitter.
fixes #26937.

Built from https://develop.svn.wordpress.org/trunk@27635


git-svn-id: http://core.svn.wordpress.org/trunk@27478 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Andrew Nacin 2014-03-20 02:59:15 +00:00
parent 2061a3aa5f
commit 413207be6d
1 changed files with 103 additions and 23 deletions
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108
wp-includes/link-template.php
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@ -1243,7 +1243,7 @@ class WP_Adjacent_Post {
}
/**
* Allow direct access to adjacent post from the class instance itself
* Allow direct access to adjacent post from the class instance itself.
*
* @param string $property Property to get.
* @return mixed String when adjacent post is found and post property exists. Null when no adjacent post is found.
@ -1296,9 +1296,15 @@ class WP_Adjacent_Post {
'post_type' => 'post',
'orderby' => 'date',
'order' => 'previous' === $this->adjacent ? 'DESC' : 'ASC',
'ignore_sticky_posts' => true,
'date_query' => array(),
// Performance considerations:
'no_found_rows' => true,
'cache_results' => true,
'date_query' => array(),
'update_post_term_cache' => false,
'update_post_meta_cache' => false,
'split_the_query' => wp_using_ext_object_cache(),
);
$tax_query = array();
@ -1388,14 +1394,37 @@ class WP_Adjacent_Post {
*/
remove_filter( 'posts_clauses', array( $this, 'filter' ) );
/*
* The `join` and `where` filters are identical in their parameters,
* so we can use the same approach for both.
/**
* If no legacy filter callbacks are registered, proceed no further.
*/
foreach ( array( 'join', 'where' ) as $clause ) {
if ( has_filter( 'get_' . $this->adjacent . '_post_' . $clause ) ) {
$clauses[ $clause ] = $this->filter_join_and_where( $clauses[ $clause ], $clause );
if ( ! has_filter( 'get_' . $this->adjacent . '_post_join' ) && ! has_filter( 'get_' . $this->adjacent . '_post_where' ) && ! has_filter( 'get_' . $this->adjacent . '_post_sort' ) ) {
return $clauses;
}
/**
* Posts table must be aliased as `p` for backwards compatibility with query previously generated by `get_adjacent_post()`.
*/
$clauses = array_map( array( $this, 'alias_posts_table' ), $clauses );
/**
* Apply the legacy `join` filter.
*/
if ( has_filter( 'get_' . $this->adjacent . '_post_join' ) ) {
$clauses['join'] = $this->filter_join( $clauses['join'] );
}
/**
* Posts table must be aliased as `p` for backwards compatibility with query previously generated by `get_adjacent_post()`.
* No filter on the table name exists, so we have to leverage the next applied filter, that for the `join` clause.
* We wait to apply this until after the legacy filter is applied so that the legacy filter doesn't remove the alias.
*/
$clauses['join'] = 'AS p ' . $clauses['join'];
/**
* Apply the legacy `where` filter.
*/
if ( has_filter( 'get_' . $this->adjacent . '_post_where' ) ) {
$clauses['where'] = $this->filter_where( $clauses['where'] );
}
/*
@ -1411,18 +1440,69 @@ class WP_Adjacent_Post {
}
/**
* Apply the deprecated `join` or `where` clause filter to the clauses built by WP_Query.
* Alias posts table as `p` to match query previously built by `get_adjacent_post()`.
*
* @param string $value
* @param string $clause
* @global $wpdb
* @param string Clause to alias
* @return string
*/
protected function filter_join_and_where( $value, $clause ) {
protected function alias_posts_table( $clause ) {
global $wpdb;
return str_replace( $wpdb->posts, 'p', $clause );
}
/**
* Apply the deprecated `join` clause filter to the clause built by WP_Query.
*
* @param string $join
* @return string
*/
protected function filter_join( $join ) {
/**
* @todo Minimal hook docs
* @deprecated 3.9.0
*/
return apply_filters( 'get_' . $this->adjacent . '_post_' . $clause, $value, $this->in_same_term, $this->excluded_terms );
return apply_filters( 'get_' . $this->adjacent . '_post_join', $join, $this->in_same_term, $this->excluded_terms );
}
/**
* Apply the deprecated `where` clause filter to the clause built by WP_Query.
*
* @param string $join
* @return string
*/
protected function filter_where( $where ) {
$where = trim( $where );
// The legacy filter passed the entire clause, including the `WHERE`, while WP_Query's filter does not.
// We prepend the `WHERE` for the benefit of legacy callbacks that look for it.
if ( 0 !== stripos( $where, 'where' ) ) {
$where = 'WHERE 1=1 ' . $where;
}
/**
* @deprecated 3.9.0
*/
$where = apply_filters( 'get_' . $this->adjacent . '_post_where', $where, $this->in_same_term, $this->excluded_terms );
$where = trim( $where );
// The legacy filter passed the entire clause, including the `WHERE`, while WP_Query's filter does not.
// Removing the `WHERE` is necessary as we've added it above, and the legacy filter could include it in the returned string.
if ( 0 === stripos( $where, 'where 1=1' ) ) {
$where = substr( $where, 9 );
} elseif ( 0 === stripos( $where, 'where' ) ) {
$where = substr( $where, 5 );
}
$where = trim( $where );
// WP_Query expects that the string returned begins with `AND`, as it is prepended with "1=1" when the clauses are joined
if ( 0 !== stripos( $where, 'and' ) ) {
$where = 'AND ' . $where;
}
return $where;
}
/**