通过post meta在wordpress中进行自定义查询搜索

Question

我在wordpress中进行自定义搜索，我希望通过自定义元键搜索来查找自定义类型的文章。

此代码按自定义类型过滤帖子，但会按自定义元素过滤所有帖子，但不显示任何结果！

function filtri_di_ricerca( $query ) {
    if ( is_admin() || ! $query->is_main_query() )
        return;

    if (is_home())
    {
        $query->set('post_type', 'post_annunci');  
        $query->set('posts_per_page', 1000);

        $meta_query = array();

        // Only check these form fields
        $fields = array( 'annuncio_contratto', 'annuncio_categorie', 'annuncio_tipologia', 'annuncio_citta', 'annuncio_prezzo');
        foreach( $fields as $field ) {
            if( $_GET[$field] != '' ) {
                // We have something to match, otherwise ignore the field...
                $meta_query[] = array(
                    'key' => $field,
                    'value' => $_GET[$field], 
                    'compare' => '='
                );
            }
        }
        $meta_query['relation'] = 'AND';

        $query->set('meta_query',$meta_query);
    }

    return;
}
add_action( 'pre_get_posts', 'filtri_di_ricerca');

搜索地址为：

http://example.com/?annuncio_contratto=Vendita&annuncio_categorie=Residenziale&annuncio_tipologia=Appartamento&annuncio_citta=NewYork

调试：

echo "<pre>"; print_r($wp_query->query_vars); echo "</pre>";

结果：

Array
(
    [error] => 
    [m] => 0
    [p] => 0
    [post_parent] => 
    [subpost] => 
    [subpost_id] => 
    [attachment] => 
    [attachment_id] => 0
    [name] => 
    [static] => 
    [pagename] => 
    [page_id] => 0
    [second] => 
    [minute] => 
    [hour] => 
    [day] => 0
    [monthnum] => 0
    [year] => 0
    [w] => 0
    [category_name] => 
    [tag] => 
    [cat] => 
    [tag_id] => 
    [author_name] => 
    [feed] => 
    [tb] => 
    [paged] => 0
    [comments_popup] => 
    [meta_key] => 
    [meta_value] => 
    [preview] => 
    [s] => 
    [sentence] => 
    [fields] => 
    [menu_order] => 
    [category__in] => Array
        (
        )

    [category__not_in] => Array
        (
        )

    [category__and] => Array
        (
        )

    [post__in] => Array
        (
        )

    [post__not_in] => Array
        (
        )

    [tag__in] => Array
        (
        )

    [tag__not_in] => Array
        (
        )

    [tag__and] => Array
        (
        )

    [tag_slug__in] => Array
        (
        )

    [tag_slug__and] => Array
        (
        )

    [post_type] => post_annunci
    [posts_per_page] => 1000
    [meta_query] => Array
        (
            [0] => Array
                (
                    [key] => annuncio_contratto
                    [value] => Vendita
                    [compare] => =
                )

            [1] => Array
                (
                    [key] => annuncio_categorie
                    [value] => Residenziale
                    [compare] => =
                )

            [2] => Array
                (
                    [key] => annuncio_tipologia
                    [value] => Appartamento
                    [compare] => =
                )

            [3] => Array
                (
                    [key] => annuncio_citta
                    [value] => Pesaro
                    [compare] => =
                )

            [relation] => AND
        )

    [ignore_sticky_posts] => 
    [suppress_filters] => 
    [cache_results] => 1
    [update_post_term_cache] => 1
    [update_post_meta_cache] => 1
    [nopaging] => 
    [comments_per_page] => 50
    [no_found_rows] => 
    [order] => DESC
)

Answer 1

function filtri_di_ricerca( $query ) {
    if ( is_admin() || ! $query->is_main_query() )
        return;

    if (is_home())
    {
       $query->set('post_type', 'post_annunci');  // added
       $query->set('posts_per_page', 1000);  //added
       $meta_query = array();  //edited

        // Only check these form fields
        $fields = array( 'annuncio_contratto', 'annuncio_categorie', 'annuncio_tipologia', 'annuncio_citta', 'annuncio_prezzo');

        foreach( $fields as $field ) {
           if( isset($_GET[$field]) and $_GET[$field] != '' ) {     // ADDED isset()
               // We have something to match, otherwise ignore the field...
               $meta_query[] = array(
                   'key' => $field,
                   'value' => $_GET[$field], 
                   'compare' => '=',    // CHANGED
               );
           }
       }
       $meta_query['relation'] = 'AND';   // ADDED


    $query->set('meta_query',$meta_query);
    }

    return;
}
add_action( 'pre_get_posts', 'filtri_di_ricerca');

修改

当您将主查询数据和元查询数据放在同一个购物篮中时，您出错了。