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<title>[27836] trunk: Revert the conversion of adjacent post queries to WP_Query.</title>
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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://core.trac.wordpress.org/changeset/27836">27836</a></dd>
<dt>Author</dt> <dd>nacin</dd>
<dt>Date</dt> <dd>2014-03-29 06:02:01 +0000 (Sat, 29 Mar 2014)</dd>
</dl>

<h3>Log Message</h3>
<pre>Revert the conversion of adjacent post queries to WP_Query. Explanation on the ticket.

Reverts <a href="http://core.trac.wordpress.org/changeset/27285">[27285]</a>, <a href="http://core.trac.wordpress.org/changeset/27286">[27286]</a>, <a href="http://core.trac.wordpress.org/changeset/27287">[27287]</a>, <a href="http://core.trac.wordpress.org/changeset/27288">[27288]</a>, <a href="http://core.trac.wordpress.org/changeset/27291">[27291]</a>, <a href="http://core.trac.wordpress.org/changeset/27292">[27292]</a>, <a href="http://core.trac.wordpress.org/changeset/27293">[27293]</a>, <a href="http://core.trac.wordpress.org/changeset/27296">[27296]</a>, <a href="http://core.trac.wordpress.org/changeset/27633">[27633]</a>, <a href="http://core.trac.wordpress.org/changeset/27634">[27634]</a>, <a href="http://core.trac.wordpress.org/changeset/27635">[27635]</a>, and <a href="http://core.trac.wordpress.org/changeset/27692">[27692]</a>.

see <a href="http://core.trac.wordpress.org/ticket/26937">#26937</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludeslinktemplatephp">trunk/src/wp-includes/link-template.php</a></li>
<li><a href="#trunksrcwpincludesloadphp">trunk/src/wp-includes/load.php</a></li>
<li><a href="#trunksrcwpincludesqueryphp">trunk/src/wp-includes/query.php</a></li>
<li><a href="#trunktestsphpunittestslinkphp">trunk/tests/phpunit/tests/link.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludeslinktemplatephp"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-includes/link-template.php (27835 => 27836)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-includes/link-template.php  2014-03-29 05:17:57 UTC (rev 27835)
+++ trunk/src/wp-includes/link-template.php     2014-03-29 06:02:01 UTC (rev 27836)
</span><span class="lines">@@ -1133,423 +1133,82 @@
</span><span class="cx">  * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
</span><span class="cx">  * @param bool         $previous       Optional. Whether to retrieve previous post.
</span><span class="cx">  * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
</span><del>- * @return mixed       Post object if successful. Null if current post doesn't exist. Empty string if no corresponding adjacent post exists.
</del><ins>+ * @return mixed       Post object if successful. Null if global $post is not set. Empty string if no corresponding post exists.
</ins><span class="cx">  */
</span><span class="cx"> function get_adjacent_post( $in_same_term = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {
</span><del>-       if ( is_string( $excluded_terms ) && false !== strpos( $excluded_terms, ' and ' ) ) {
-               // back-compat: $excluded_terms used to be IDs separated by " and "
-               _deprecated_argument( __FUNCTION__, '3.3', sprintf( __( 'Use commas instead of %s to separate excluded terms.' ), "'and'" ) );
-               $excluded_terms = explode( ' and ', $excluded_terms );
-       }
-       if ( $excluded_terms ) {
-               $excluded_terms = wp_parse_id_list( $excluded_terms );
-       } else {
-               $excluded_terms = array();
-       }
</del><ins>+        global $wpdb;
</ins><span class="cx"> 
</span><del>-       $adjacent = new WP_Adjacent_Post( array(
-               'post'           => get_post(),
-               'previous'       => $previous,
-               'taxonomy'       => $taxonomy,
-               'in_same_term'   => $in_same_term,
-               'excluded_terms' => $excluded_terms,
-       ) );
</del><ins>+        if ( ( ! $post = get_post() ) || ! taxonomy_exists( $taxonomy ) )
+               return null;
</ins><span class="cx"> 
</span><del>-       return $adjacent->adjacent_post;
-}
</del><ins>+        $current_post_date = $post->post_date;
</ins><span class="cx"> 
</span><del>-/**
- * WordPress Adjacent Post API
- *
- * Based on the current or specified post, determines either the previous or
- * next post based on the criteria specified. Supports retrieving posts with
- * the same taxonomy terms and posts that lack specific terms.
- *
- * @since 3.9.0
- *
- * @package WordPress
- * @subpackage Template
- */
-class WP_Adjacent_Post {
</del><ins>+        $join = '';
+       $posts_in_ex_terms_sql = '';
+       if ( $in_same_term || ! empty( $excluded_terms ) ) {
+               $join = " INNER JOIN $wpdb->term_relationships AS tr ON p.ID = tr.object_id INNER JOIN $wpdb->term_taxonomy tt ON tr.term_taxonomy_id = tt.term_taxonomy_id";
</ins><span class="cx"> 
</span><del>-       /**
-        * Adjacent post object.
-        *
-        * @since 3.9.0
-        * @access public
-        * @var null|WP_Adjacent_Post
-        */
-       public $adjacent_post = null;
-
-       /**
-        * Current post object.
-        *
-        * @since 3.9.0
-        * @access protected
-        * @var bool|WP_Post
-        */
-       protected $current_post = false;
-
-       /**
-        * 'previous' or 'next' type of adjacent post.
-        *
-        * @since 3.9.0
-        * @access protected
-        * @var string
-        */
-       protected $adjacent = 'previous';
-
-       /**
-        * Post taxonomy.
-        *
-        * @since 3.9.0
-        * @access protected
-        * @var string
-        */
-       protected $taxonomy = 'category';
-
-       /**
-        * Whether the post should be in a same taxonomy term.
-        *
-        * @since 3.9.0
-        * @access protected
-        * @var string
-        */
-       protected $in_same_term = false;
-
-       /**
-        * Excluded term IDs.
-        *
-        * @since 3.9.0
-        * @access protected
-        * @var string|array
-        */
-       protected $excluded_terms = '';
-
-       /**
-        * Class constructor.
-        *
-        * The post is queried is run if arguments are passed to the constructor.
-        * Otherwise, the get_post() method will need to be called.
-        *
-        * @param array $args Optional. See the get_post() method for $args.
-        */
-       public function __construct( $args = array() ) {
-               if ( empty( $args ) ) {
-                       return;
</del><ins>+                if ( $in_same_term ) {
+                       if ( ! is_object_in_taxonomy( $post->post_type, $taxonomy ) )
+                               return '';
+                       $term_array = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'ids' ) );
+                       if ( ! $term_array || is_wp_error( $term_array ) )
+                               return '';
+                       $join .= $wpdb->prepare( " AND tt.taxonomy = %s AND tt.term_id IN (" . implode( ',', array_map( 'intval', $term_array ) ) . ")", $taxonomy );
</ins><span class="cx">           }
</span><span class="cx"> 
</span><del>-               $this->get_post( $args );
-       }
-
-       /**
-        * 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.
-        */
-       public function __get( $property ) {
-               if ( is_object( $this->adjacent_post ) && property_exists( $this->adjacent_post, $property ) ) {
-                       return $this->adjacent_post->{$property};
-               } else {
-                       return null;
-               }
-       }
-
-       /**
-        * Determine adjacent post for specified post and adjacency.
-        *
-        * @since 3.9.0
-        *
-        * @param array $args {
-        *     Arguments for querying the adjacent post.
-        *
-        *     @type mixed  $post           Optional. Post object or ID to find adjacent post for.
-        *     @type bool   $previous       Optional. Whether to retrieve previous post.
-        *     @type string $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
-        *     @type bool   $in_same_term   Optional. Whether post should be in a same taxonomy term.
-        *     @type array  $excluded_terms Optional. Array of excluded term IDs.
-        * }
-        * @return mixed Post object on success. False if no adjacent post exists. Null on failure.
-        */
-       protected function get_post( $args ) {
-               $this->current_post   = get_post( $args['post'] );
-               $this->excluded_terms = array_map( 'intval', $args['excluded_terms'] );
-               $this->adjacent       = $args['previous'] ? 'previous' : 'next';
-               $this->taxonomy       = $args['taxonomy'];
-               $this->in_same_term   = (bool) $args['in_same_term'];
-
-               // Return null when either the post or taxonomy doesn't exist.
-               if ( ! $this->current_post ) {
-                       return;
-               }
-               if ( $this->in_same_term || $this->excluded_terms ) {
-                       if ( ! taxonomy_exists( $args['taxonomy'] ) ) {
-                               return;
</del><ins>+                $posts_in_ex_terms_sql = $wpdb->prepare( "AND tt.taxonomy = %s", $taxonomy );
+               if ( ! empty( $excluded_terms ) ) {
+                       if ( ! is_array( $excluded_terms ) ) {
+                               // back-compat, $excluded_terms used to be $excluded_terms with IDs separated by " and "
+                               if ( false !== strpos( $excluded_terms, ' and ' ) ) {
+                                       _deprecated_argument( __FUNCTION__, '3.3', sprintf( __( 'Use commas instead of %s to separate excluded terms.' ), "'and'" ) );
+                                       $excluded_terms = explode( ' and ', $excluded_terms );
+                               } else {
+                                       $excluded_terms = explode( ',', $excluded_terms );
+                               }
</ins><span class="cx">                   }
</span><del>-               }
</del><span class="cx"> 
</span><del>-               // Build our arguments for WP_Query.
-               $query_args = array(
-                       'posts_per_page'      => 1,
-                       'post_status'         => 'publish',
-                       'post_type'           => $this->current_post->post_type,
-                       'orderby'             => 'date',
-                       'order'               => 'previous' === $this->adjacent ? 'DESC' : 'ASC',
-                       'ignore_sticky_posts' => true,
-                       'date_query'          => array(),
</del><ins>+                        $excluded_terms = array_map( 'intval', $excluded_terms );
</ins><span class="cx"> 
</span><del>-                       // Performance considerations:
-                       'no_found_rows'          => true,
-                       'cache_results'          => true,
-                       'update_post_term_cache' => false,
-                       'update_post_meta_cache' => false,
-                       'split_the_query'        => wp_using_ext_object_cache(),
-               );
-
-               $tax_query = array();
-
-               // Set up for requests limited to posts that share terms.
-               if ( $this->in_same_term ) {
-                       $terms = get_the_terms( $this->current_post->ID, $args['taxonomy'] );
-
-                       if ( is_array( $terms ) && ! empty( $terms ) ) {
-                               $terms = wp_list_pluck( $terms, 'term_id' );
-                               $terms = array_values( $terms );
-                               $terms = array_map( 'intval', $terms );
-                       } else {
-                               unset( $terms );
</del><ins>+                        if ( ! empty( $term_array ) ) {
+                               $excluded_terms = array_diff( $excluded_terms, $term_array );
+                               $posts_in_ex_terms_sql = '';
</ins><span class="cx">                   }
</span><del>-               }
</del><span class="cx"> 
</span><del>-               // Handle excluded terms.
-               if ( $this->excluded_terms ) {
-                       $tax_query[] = array(
-                               'taxonomy' => $args['taxonomy'],
-                               'slugs'    => $this->excluded_terms,
-                               'compare'  => 'NOT IN',
-                       );
-               }
-
-               // If requesting same term, ensure excluded terms don't appear in term list.
-               if ( isset( $terms ) ) {
-                       if ( isset( $this->excluded_terms ) && is_array( $this->excluded_terms ) ) {
-                               $terms = array_diff( $terms, $this->excluded_terms );
</del><ins>+                        if ( ! empty( $excluded_terms ) ) {
+                               $posts_in_ex_terms_sql = $wpdb->prepare( " AND tt.taxonomy = %s AND tt.term_id NOT IN (" . implode( $excluded_terms, ',' ) . ')', $taxonomy );
</ins><span class="cx">                   }
</span><del>-
-                       if ( ! empty( $terms ) ) {
-                               $tax_query[] = array(
-                                       'taxonomy' => $args['taxonomy'],
-                                       'terms'    => $terms,
-                               );
-                       }
</del><span class="cx">           }
</span><del>-
-               // If we have a tax query, add it to our query args.
-               if ( $tax_query ) {
-                       $query_args['tax_query'] = $tax_query;
-               }
-
-               // And now, the date constraint.
-               $date_query_key = 'previous' === $this->adjacent ? 'before' : 'after';
-
-               $query_args['date_query'][] = array(
-                       $date_query_key => $this->current_post->post_date,
-                       'inclusive'     => true,
-               );
-
-               // Ensure the current post isn't returned, since we're using an inclusive date query.
-               $query_args['post__not_in'] = array( $this->current_post->ID );
-
-               /**
-                * Filter the arguments passed to WP_Query when finding an adjacent post.
-                *
-                * @since 3.9.0
-                *
-                * @param array $query_args WP_Query arguments.
-                * @param array $args       Arguments passed to WP_Adjacent_Post.
-                */
-               $query_args = apply_filters( 'get_adjacent_post_query_args', $query_args, $args );
-
-               add_filter( 'posts_clauses', array( $this, 'filter' ) );
-               $query = new WP_Query( $query_args );
-
-               if ( $query->posts ) {
-                       $this->adjacent_post = $query->post;
-               } else {
-                       $this->adjacent_post = false;
-               }
</del><span class="cx">   }
</span><span class="cx"> 
</span><del>-       /**
-        * Apply the deprecated filters to WP_Query's clauses.
-        *
-        * @param array $clauses
-        * @return array
-        */
-       public function filter( $clauses ) {
-               /*
-                * Immediately deregister these legacy filters to avoid modifying
-                * any calls to WP_Query from filter callbacks hooked to WP_Query filters.
-                */
-               remove_filter( 'posts_clauses', array( $this, 'filter' ) );
</del><ins>+        $adjacent = $previous ? 'previous' : 'next';
+       $op = $previous ? '<' : '>';
+       $order = $previous ? 'DESC' : 'ASC';
</ins><span class="cx"> 
</span><del>-               /**
-                * If no legacy filter callbacks are registered, proceed no further.
-                */
-               if ( ! has_filter( 'get_' . $this->adjacent . '_post_join' ) && ! has_filter( 'get_' . $this->adjacent . '_post_where' ) && ! has_filter( 'get_' . $this->adjacent . '_post_sort' ) ) {
-                       return $clauses;
-               }
</del><ins>+        $join  = apply_filters( "get_{$adjacent}_post_join", $join, $in_same_term, $excluded_terms );
+       $where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare( "WHERE p.post_date $op %s AND p.post_type = %s AND p.post_status = 'publish' $posts_in_ex_terms_sql", $current_post_date, $post->post_type), $in_same_term, $excluded_terms );
+       $sort  = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1" );
</ins><span class="cx"> 
</span><del>-               /**
-                * 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'] );
-               }
-
-               /*
-                * The legacy `sort` filter combined the ORDER BY and LIMIT clauses,
-                * while `WP_Query` does not, which requires special handling.
-                */
-               if ( has_filter( 'get_' . $this->adjacent . '_post_sort' ) ) {
-                       $sort_clauses = $this->filter_sort( $clauses['orderby'], $clauses['limits'] );
-                       $clauses      = array_merge( $clauses, $sort_clauses );
-               }
-
-               return $clauses;
</del><ins>+        $query = "SELECT p.ID FROM $wpdb->posts AS p $join $where $sort";
+       $query_key = 'adjacent_post_' . md5( $query );
+       $result = wp_cache_get( $query_key, 'counts' );
+       if ( false !== $result ) {
+               if ( $result )
+                       $result = get_post( $result );
+               return $result;
</ins><span class="cx">   }
</span><span class="cx"> 
</span><del>-       /**
-        * Alias posts table as `p` to match query previously built by `get_adjacent_post()`.
-        *
-        * @global $wpdb
-        * @param string  Clause to alias
-        * @return string
-        */
-       protected function alias_posts_table( $clause ) {
-               global $wpdb;
</del><ins>+        $result = $wpdb->get_var( $query );
+       if ( null === $result )
+               $result = '';
</ins><span class="cx"> 
</span><del>-               return str_replace( $wpdb->posts, 'p', $clause );
-       }
</del><ins>+        wp_cache_set( $query_key, $result, 'counts' );
</ins><span class="cx"> 
</span><del>-       /**
-        * Apply the deprecated `join` clause filter to the clause built by WP_Query.
-        *
-        * @param string $join
-        * @return string
-        */
-       protected function filter_join( $join ) {
-               /**
-                * @deprecated 3.9.0
-                */
-               return apply_filters( 'get_' . $this->adjacent . '_post_join', $join, $this->in_same_term, $this->excluded_terms );
-       }
</del><ins>+        if ( $result )
+               $result = get_post( $result );
</ins><span class="cx"> 
</span><del>-       /**
-        * 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;
-       }
-
-       /**
-        * Apply deprecated `sort` filter, which applies to both the ORDER BY and LIMIT clauses.
-        *
-        * @param string $orderby
-        * @param string $limits
-        * @return array
-        */
-       protected function filter_sort( $orderby, $limits ) {
-               /**
-                * @deprecated 3.9.0
-                */
-               $sort = apply_filters( 'get_' . $this->adjacent . '_post_sort', 'ORDER BY ' . $orderby . ' ' . $limits );
-
-               if ( empty( $sort ) ) {
-                       return compact( 'orderby', 'limits' );
-               }
-
-               // The legacy filter could allow either clause to be removed, or their order inverted, so we need to know what we have and where.
-               $has_order_by = stripos( $sort, 'order by' );
-               $has_limit    = stripos( $sort, 'limit' );
-
-               // Split the string of one or two clauses into their respective array keys
-               if ( false !== $has_order_by && false !== $has_limit ) {
-                       /*
-                        * The LIMIT clause cannot appear before the ORDER BY clause in a valid query
-                        * However, since the legacy filter would allow a user to invert the order,
-                        * we maintain that handling so the same errors are triggered.
-                        */
-                       if ( $has_order_by < $has_limit ) {
-                               $orderby = trim( str_ireplace( 'order by', '', substr( $sort, 0, $has_limit ) ) );
-                               $limits  = trim( substr( $sort, $has_limit ) );
-                       } else {
-                               $orderby = trim( str_ireplace( 'order by', '', substr( $sort, $has_order_by ) ) );
-                               $limits  = trim( substr( $sort, 0, $has_order_by ) );
-                       }
-               } elseif ( false !== $has_order_by ) {
-                       $orderby = trim( str_ireplace( 'order by', '', $sort ) );
-                       $limits  = '';
-               } elseif ( false !== $has_limit ) {
-                       $orderby = '';
-                       $limits  = trim( $sort );
-               }
-
-               return compact( 'orderby', 'limits' );
-       }
</del><ins>+        return $result;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> /**
</span></span></pre></div>
<a id="trunksrcwpincludesloadphp"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-includes/load.php (27835 => 27836)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-includes/load.php   2014-03-29 05:17:57 UTC (rev 27835)
+++ trunk/src/wp-includes/load.php      2014-03-29 06:02:01 UTC (rev 27836)
</span><span class="lines">@@ -377,7 +377,7 @@
</span><span class="cx">  $current_using = $_wp_using_ext_object_cache;
</span><span class="cx">  if ( null !== $using )
</span><span class="cx">          $_wp_using_ext_object_cache = $using;
</span><del>-       return (bool) $current_using;
</del><ins>+        return $current_using;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> /**
</span></span></pre></div>
<a id="trunksrcwpincludesqueryphp"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-includes/query.php (27835 => 27836)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-includes/query.php  2014-03-29 05:17:57 UTC (rev 27835)
+++ trunk/src/wp-includes/query.php     2014-03-29 06:02:01 UTC (rev 27836)
</span><span class="lines">@@ -3221,9 +3221,6 @@
</span><span class="cx">          }
</span><span class="cx"> 
</span><span class="cx">          $split_the_query = ( $old_request == $this->request && "$wpdb->posts.*" == $fields && !empty( $limits ) && $q['posts_per_page'] < 500 );
</span><del>-               if ( $split_the_query && isset( $q['split_the_query'] ) && empty( $q['split_the_query'] ) ) {
-                       $split_the_query = false;
-               }
</del><span class="cx"> 
</span><span class="cx">          /**
</span><span class="cx">           * Filter whether to split the query.
</span></span></pre></div>
<a id="trunktestsphpunittestslinkphp"></a>
<div class="modfile"><h4>Modified: trunk/tests/phpunit/tests/link.php (27835 => 27836)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/tests/phpunit/tests/link.php       2014-03-29 05:17:57 UTC (rev 27835)
+++ trunk/tests/phpunit/tests/link.php  2014-03-29 06:02:01 UTC (rev 27836)
</span><span class="lines">@@ -188,150 +188,4 @@
</span><span class="cx">          $this->assertEquals( array( $post_two ), get_boundary_post( true, '', true, 'post_tag' ) );
</span><span class="cx">          $this->assertEquals( array( $post_four ), get_boundary_post( true, '', false, 'post_tag' ) );
</span><span class="cx">  }
</span><del>-
-       /**
-        * @ticket 26937
-        */
-       function test_legacy_get_adjacent_post_filters() {
-               // Need some sample posts to test adjacency
-               $post_one = $this->factory->post->create_and_get( array(
-                       'post_title' => 'First',
-                       'post_date'  => '2012-01-01 12:00:00',
-               ) );
-
-               $post_two = $this->factory->post->create_and_get( array(
-                       'post_title' => 'Second',
-                       'post_date'  => '2012-02-01 12:00:00',
-               ) );
-
-               $post_three = $this->factory->post->create_and_get( array(
-                       'post_title' => 'Third',
-                       'post_date'  => '2012-03-01 12:00:00',
-               ) );
-
-               $post_four = $this->factory->post->create_and_get( array(
-                       'post_title' => 'Fourth',
-                       'post_date'  => '2012-04-01 12:00:00',
-               ) );
-
-               // Use pages to test post-type adjacency
-               $page_one = $this->factory->post->create_and_get( array(
-                       'post_title' => 'First Page',
-                       'post_date'  => '2013-01-01 12:00:00',
-                       'post_type'  => 'page',
-               ) );
-
-               $page_two = $this->factory->post->create_and_get( array(
-                       'post_title' => 'Second Page',
-                       'post_date'  => '2013-02-01 12:00:00',
-                       'post_type'  => 'page',
-               ) );
-
-               // Add some meta so we can join the postmeta table and query
-               add_post_meta( $post_three->ID, 'unit_test_meta', 'waffle' );
-
-               // Test "where" filter for a previous post
-               add_filter( 'get_previous_post_where', array( $this, 'filter_previous_post_where' ) );
-               $this->go_to( get_permalink( $post_three->ID ) );
-               $this->assertEquals( $post_one, get_adjacent_post( false, null, true ) );
-               remove_filter( 'get_previous_post_where', array( $this, 'filter_previous_post_where' ) );
-
-               // Test "where" filter for a next post
-               add_filter( 'get_next_post_where', array( $this, 'filter_next_post_where' ) );
-               $this->go_to( get_permalink( $post_two->ID ) );
-               $this->assertEquals( $post_four, get_adjacent_post( false, null, false ) );
-               remove_filter( 'get_next_post_where', array( $this, 'filter_next_post_where' ) );
-
-               // Test "where" filter that writes its own query
-               add_filter( 'get_previous_post_where', array( $this, 'override_previous_post_where_clause' ) );
-               $this->go_to( get_permalink( $post_four->ID ) );
-               $this->assertEquals( $post_two, get_adjacent_post( false, null, true ) );
-               remove_filter( 'get_previous_post_where', array( $this, 'override_previous_post_where_clause' ) );
-
-               // Test "join" filter by joining the postmeta table and restricting by meta key
-               add_filter( 'get_next_post_join', array( $this, 'filter_next_post_join' ) );
-               add_filter( 'get_next_post_where', array( $this, 'filter_next_post_where_with_join' ) );
-               $this->go_to( get_permalink( $post_one->ID ) );
-               $this->assertEquals( $post_three, get_adjacent_post( false, null, false ) );
-               remove_filter( 'get_next_post_join', array( $this, 'filter_next_post_join' ) );
-               remove_filter( 'get_next_post_where', array( $this, 'filter_next_post_where_with_join' ) );
-
-               // Test "sort" filter when modifying ORDER BY clause
-               add_filter( 'get_next_post_sort', array( $this, 'filter_next_post_sort' ) );
-               $this->go_to( get_permalink( $post_one->ID ) );
-               $this->assertEquals( $post_four, get_adjacent_post( false, null, false ) );
-               remove_filter( 'get_next_post_sort', array( $this, 'filter_next_post_sort' ) );
-
-               // Test "sort" filter when modifying LIMIT clause
-               add_filter( 'get_next_post_sort', array( $this, 'filter_next_post_sort_limit' ) );
-               $this->go_to( get_permalink( $post_one->ID ) );
-               $this->assertEquals( $post_three, get_adjacent_post( false, null, false ) );
-               remove_filter( 'get_next_post_sort', array( $this, 'filter_next_post_sort_limit' ) );
-
-               // Test post-type specificity
-               $this->go_to( get_permalink( $page_one ) );
-               $this->assertEquals( $page_two, get_adjacent_post( false, null, false ) );
-
-               $this->go_to( get_permalink( $page_two ) );
-               $this->assertEquals( $page_one, get_adjacent_post( false, null, true ) );
-       }
-
-       /**
-        * Filter callback for `test_legacy_get_adjacent_post_filters()`
-        */
-       function filter_previous_post_where( $where ) {
-               $where .= " AND post_title !='Second'";
-               return $where;
-       }
-
-       /**
-        * Filter callback for `test_legacy_get_adjacent_post_filters()`
-        */
-       function filter_next_post_where( $where ) {
-               $where .= " AND post_title !='Third'";
-               return $where;
-       }
-
-       /**
-        * Filter callback for `test_legacy_get_adjacent_post_filters()`
-        */
-       function override_previous_post_where_clause( $where ) {
-               $where = "WHERE p.post_date < '2012-02-28'";
-               return $where;
-       }
-
-       /**
-        * Filter callback for `test_legacy_get_adjacent_post_filters()`
-        */
-       function filter_next_post_join( $join ) {
-               global $wpdb;
-
-               $join .= " INNER JOIN {$wpdb->postmeta} ON p.ID = {$wpdb->postmeta}.post_id";
-               return $join;
-       }
-
-       /**
-        * Filter callback for `test_legacy_get_adjacent_post_filters()`
-        */
-       function filter_next_post_where_with_join( $where ) {
-               global $wpdb;
-
-               $where .= " AND {$wpdb->postmeta}.meta_key = 'unit_test_meta'";
-               return $where;
-       }
-
-       /**
-        * Filter callback for `test_legacy_get_adjacent_post_filters()`
-        */
-       function filter_next_post_sort( $sort ) {
-               return str_replace( 'p.post_date', 'p.post_title', $sort );
-       }
-
-       /**
-        * Filter callback for `test_legacy_get_adjacent_post_filters()`
-        */
-       function filter_next_post_sort_limit( $sort ) {
-               $sort = str_replace( 'LIMIT 0, 1', 'LIMIT 1, 2', $sort );
-               return $sort;
-       }
</del><span class="cx"> }
</span><span class="cx">\ No newline at end of file
</span></span></pre>
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