使用wp_query是否可以按分类排序？

#1 楼

#2 楼

#3 楼

function orderby_tax_clauses( $clauses, $wp_query ) {
    global $wpdb;
    $taxonomies = get_taxonomies();
    foreach ($taxonomies as $taxonomy) {
        if ( isset( $wp_query->query['orderby'] ) && $taxonomy == $wp_query->query['orderby'] ) {
            $clauses['join'] .=<<<SQL
LEFT OUTER JOIN {$wpdb->term_relationships} ON {$wpdb->posts}.ID={$wpdb->term_relationships}.object_id
LEFT OUTER JOIN {$wpdb->term_taxonomy} USING (term_taxonomy_id)
LEFT OUTER JOIN {$wpdb->terms} USING (term_id)
SQL;
            $clauses['where'] .= " AND (taxonomy = '{$taxonomy}' OR taxonomy IS NULL)";
            $clauses['groupby'] = "object_id";
            $clauses['orderby'] = "GROUP_CONCAT({$wpdb->terms}.name ORDER BY name ASC) ";
            $clauses['orderby'] .= ( 'ASC' == strtoupper( $wp_query->get('order') ) ) ? 'ASC' : 'DESC';
        }
    }
    return $clauses;
}

    add_filter('posts_clauses', 'orderby_tax_clauses', 10, 2 );

#4 楼

$tax_query = array();
$tax_query['relation']="OR";
$tax_query[] = array(
    'taxonomy' => 'product_cat',
    'field'    => 'slug',
    'terms'    => $cat_terms,
);
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;

$args = array(
    'post_type'=>'post',
    'posts_per_page'=>12,
    'paged'=>$paged,
    'tax_query' => $tax_query,
);

add_filter('posts_orderby', 'edit_posts_orderby');
function edit_posts_orderby($orderby_statement) {
    $orderby_statement = " term_taxonomy_id ASC ";
    return $orderby_statement;
}
query_posts($args);
remove_filter('posts_orderby', 'edit_posts_orderby');

#5 楼

   <?php // Default
    $wheels_args = array(
        'post_type' => 'wheels',
        'posts_per_page' => '96',
        'orderby' => 'taxonomy, name', // Just enter 2 parameters here, seprated by comma
        'order'=>'ASC'
    );
    $loop = new WP_Query($wheels_args);
    ?>

#6 楼

SELECT SQL_CALC_FOUND_ROWS wp_posts.ID 
FROM wp_posts 
INNER JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id) 
WHERE 1=1 
AND ( wp_term_relationships.term_taxonomy_id IN (5,6,7,8,9,10,11,12,13,15,16,17,18,19,20,21,22,23,25,26,28,29,31,32,33,35,38,95,101,102,193) )
AND wp_posts.post_type IN ('ruta', 'nav_menu_item') 
AND (wp_posts.post_status = 'publish' OR wp_posts.post_author = 45 
AND wp_posts.post_status = 'private') 
GROUP BY wp_posts.ID 
ORDER BY wp_posts.post_date DESC LIMIT 0, 20

SELECT SQL_CALC_FOUND_ROWS wp_posts.ID, tt1.parent AS pare,
    (
    SELECT COUNT(*) 
    FROM  wp_posts
    INNER JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id)
    INNER JOIN wp_term_taxonomy AS tt1 ON ( tt1.term_taxonomy_id =      wp_term_relationships.term_taxonomy_id )
    INNER JOIN wp_term_taxonomy AS tt2 ON ( tt2.term_taxonomy_id =  tt1.term_taxonomy_id )
    WHERE 1=1  
    AND tt1.parent = pare
    ) AS Total
FROM  wp_posts
INNER JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id)
INNER JOIN wp_term_taxonomy AS tt1 ON ( tt1.term_taxonomy_id =      wp_term_relationships.term_taxonomy_id )
INNER JOIN wp_terms ON ( tt1.term_id = wp_terms.term_id )
WHERE 1=1  
AND ( wp_term_relationships.term_taxonomy_id IN (5,6,7,8,9,10,11,12,13,15,16,17,18,19,20,21,22,23,25,26,28,29,31,32,33,35,38,95,101,102,193) ) 
AND wp_posts.post_type IN ('ruta', 'nav_menu_item') 
AND (wp_posts.post_status = 'publish' OR wp_posts.post_author = 45 
AND wp_posts.post_status = 'private') 
GROUP BY wp_posts.ID 
ORDER BY
total DESC,
wp_terms.name  

function xc_query_fields( $fields ) {

   $fields = "wp_posts.ID, wp_posts.post_title, wp_terms.name, tt1.parent AS pare,
    (
    SELECT COUNT(*) 
    FROM  wp_posts
    INNER JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id)
    INNER JOIN wp_term_taxonomy AS tt1 ON ( tt1.term_taxonomy_id = wp_term_relationships.term_taxonomy_id )
    INNER JOIN wp_term_taxonomy AS tt2 ON ( tt2.term_taxonomy_id = tt1.term_taxonomy_id )
    WHERE 1=1  
    AND tt1.parent = pare
    )
    AS Total";
     return $fields;
}


function xc_query_joins( $join ) {
$join .= "INNER JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id)
   INNER JOIN wp_term_taxonomy AS tt1 ON ( tt1.term_taxonomy_id = wp_term_relationships.term_taxonomy_id )
   INNER JOIN wp_terms ON ( tt1.term_id = wp_terms.term_id )";
 return $join;
}


function xc_query_orderby( $join ) {
    $join = "total DESC, wp_terms.name ";
    return $join;
 }

function filtra_queries( $query )
{

  if (  is_archive()  && $query->is_main_query() && !is_admin()  ) {

$rutes = array('viajes-privados', 'asia', 'africa', 'oceania', 'america', 'oriente-proximo');

if  ( in_array( $query->get('category_name'), $rutes ) ) 
  {
  add_filter( 'posts_fields', 'xc_query_fields' );
  add_filter( 'posts_join', 'xc_query_joins' );
  add_filter( 'posts_orderby', 'xc_query_orderby' );
}// end if in_array

  }// end if is_archive

}
 add_filter('pre_get_posts', 'filtra_queries');

#7 楼

  // Get your terms and put them into an array
  $issue_terms = get_terms([
    'taxonomy' => 'issues',
    'hide_empty' => false,
  ]);

  // Run foreach over each term to setup query and display for posts
  foreach ($issue_terms as $issue_term) {
    $the_query = new WP_Query( array(
      'post_type' => 'post',
      'tax_query' => array(
        array(
          'taxonomy' => 'issues',
          'field' => 'slug',
          'terms' => array( $issue_term->slug ),
          'operator' => 'IN'
        )
      )
    ) );

    // Run loop over each query
    while($the_query->have_posts()) :
      $the_query->the_post();

      // YOUR TEMPLATE OUTPUT FOR EACH POST

    endwhile;
  }

#8 楼

global $wpdb;

$taxonomies = array('my-tax-1', 'my-tax-2', 'my-tax-3');

$orderby = "'".implode("', '", array_keys($taxonomies))."'";
$id_sql = $GLOBALS['wp_query']->request;

$id_sql = preg_replace('/LIMIT\s+\d+\s?,?\s\d*/', '', $id_sql);
$id_sql = str_replace('SQL_CALC_FOUND_ROWS', '', $id_sql);

$term_sql = "SELECT
  tt.taxonomy AS `taxonomy`,
  t.name AS `term_name`,
  t.slug AS `term_slug`,
  count(*) AS `term_count`
FROM ({$id_sql}) p 
JOIN wp_term_relationships tr
  ON p.ID = tr.object_id
JOIN wp_term_taxonomy tt
  ON tr.term_taxonomy_id = tt.term_taxonomy_id
JOIN wp_terms t
  ON tt.term_id = t.term_id
WHERE tt.taxonomy IN ({$orderby})
GROUP BY t.slug
ORDER BY
  FIELD(tt.taxonomy, {$orderby})"; // Add further specific ordering here

$results = $wpdb->get_results($term_sql, ARRAY_A);

#9 楼

function grouped_by_taxonomy_main_query( $query ) {

    if ( $query->is_home() && $query->is_main_query() ) { // Run only on the homepage

        $post_ids = array();

        $terms = get_terms('my_custom_taxonomy');

        foreach ( $terms as $term ) {
            $post_ids = array_merge( $post_ids, get_posts( array( 
                'posts_per_page' => 4, // as you wish...
                'post_type' => 'my_custom_post_type', // If needed... Default is posts
                'fields' => 'ids', // we only want the ids to use later in 'post__in'
                'tax_query' => array( array( 'taxonomy' => $term->taxonomy, 'field' => 'term_id', 'terms' => $term->term_id, )))) // getting posts in the current term
            );
        }

        $query->query_vars['post_type'] = 'my_custom_post_type'; // Again, if needed... Default is posts
        $query->query_vars['posts_per_page'] = 16; // If needed...
        $query->query_vars['post__in'] = $post_ids; // Filtering with the post ids we've obtained above
        $query->query_vars['orderby'] = 'post__in'; // Here we keep the order we generated in the terms loop
        $query->query_vars['ignore_sticky_posts'] = 1; // If you dont want your sticky posts to change the order

    }
}

// Hook my above function to the pre_get_posts action
add_action( 'pre_get_posts', 'grouped_by_taxonomy_main_query' );

#10 楼

function so14306_pre_get_posts($query)
{
    if (is_admin()) :
        return;
    endif;

    if ($query->is_main_query()) :
        if (is_post_type_archive('music')) :
            $query->set('orderby', 'style');

        endif;
    endif;
}

add_action('pre_get_posts', 'so14306_pre_get_posts');

function so14306_posts_clauses($clauses, $wp_query)
{
    global $wpdb;

    if (isset($wp_query->query_vars['orderby']) && $wp_query->query_vars['orderby'] === 'style') {
        $orderby = $wp_query->query_vars['orderby'];
        $clauses['join'] .= <<<SQL
LEFT OUTER JOIN {$wpdb->term_relationships} ON {$wpdb->posts}.ID={$wpdb->term_relationships}.object_id
LEFT OUTER JOIN {$wpdb->term_taxonomy} USING (term_taxonomy_id)
LEFT OUTER JOIN {$wpdb->terms} USING (term_id)
SQL;
        $clauses['where'] .= " AND (taxonomy = '{$orderby}' OR taxonomy IS NULL)";
        $clauses['groupby'] = "object_id";
        $clauses['orderby'] = "GROUP_CONCAT({$wpdb->terms}.term_order ORDER BY {$wpdb->terms}.term_order ASC) ASC";
        $clauses['orderby'] .= ", {$wpdb->posts}.post_name ASC";
    }

    return $clauses;
}

add_filter('posts_clauses', 'so14306_posts_clauses', 10, 2);

#11 楼

// 1
add_action( 'publish_post', 'save_and_add_meta' );

function save_and_add_meta($post_id){

        //Temporarily remove the action to avoid an infinite loop
        remove_action( 'publish_post', 'save_and_add_meta' );

        // 2            
        $category_slug = get_the_terms($post_id, 'your_taxonomys_name')[0]->slug;

        //3
        add_post_meta($post_id, 'cat_slug', $category_slug);

        //Add the action back in.
        add_action( 'publish_post', 'save_and_add_meta' );
}

'meta_key' => 'cat_slug',
'orderby' => 'meta_value',
'order' => 'DESC',