How to filter get previous post function by meta value DESC and post date DESC?

Question

How to filter get previous post function by meta value DESC and post date DESC?

Nick M.

2022年2月22日 07:02

My loop displays featured posts and then posts in reverse chronological order.

However when I use ?php echo get_previous_post(); ? it grabs posts in reverse chronological order.

How do I add a filter to the previous post function similiar to this but instead filter by an array like this: 'orderby' = array( 'meta_value' = 'DESC', 'date' = 'DESC') ?

Code:

UPDATE: Cleaned up index.php loop after help from @sMyles and @JackJohansson

Index.php loop:

$args = array(
    'posts_per_page'    = - 1,
    'meta_key'          = 'meta-checkbox',
    'orderby'           = array( 'meta_value' = 'DESC', 'date'  =  'DESC')

);

$posts = new WP_Query( $args );

if($posts-have_posts() ){

    while( $posts-have_posts() ){

        $posts-the_post();

        // Set to content template by default
        $template = 'content';

        // Change template to featured when `is_featured` meta has a value
        if(get_post_meta(get_the_ID(), 'meta-checkbox', 'yes')){
            $template = 'featured';
        }

        // Load template part
        get_template_part( $template, get_post_format() );

    }
}

UPDATE: As suggested, I added where I use the previous post function

Previous Post Function

div id="next-post"
    ?php $prev_post = get_previous_post();
    if(!empty($prev_post)) {
        echo 'a class="next-story" href="' . get_permalink($prev_post-ID) . '"Next Story/a'; 
        echo 'a class="next-story-title" href="' . get_permalink($prev_post-ID) . '" title="' . $prev_post-post_title . '"' . $prev_post-post_title . '/a'; 
    } ?
/div

Function For Featured Posts:

function sm_custom_meta() {
    add_meta_box( 'sm_meta', __( 'Featured Posts', 'sm-textdomain' ), 'sm_meta_callback', 'post' );
}
function sm_meta_callback( $post ) {
    $featured = get_post_meta( $post-ID );
?

p
div class="sm-row-content"
    label for="meta-checkbox"
        input type="checkbox" name="meta-checkbox" id="meta-checkbox" value="yes" ?php if ( isset ( $featured['meta-checkbox'] ) ) checked( $featured['meta-checkbox'][0], 'yes' ); ? /
        ?php _e( 'Featured this post', 'sm-textdomain' )?
    /label

/div
/p

?php
}
add_action( 'add_meta_boxes', 'sm_custom_meta' );

function sm_meta_save( $post_id ) {

    // Checks save status
    $is_autosave = wp_is_post_autosave( $post_id );
    $is_revision = wp_is_post_revision( $post_id );
    $is_valid_nonce = ( isset( $_POST[ 'sm_nonce' ] )  wp_verify_nonce( $_POST[ 'sm_nonce' ], basename( __FILE__ ) ) ) ? 'true' : 'false';

    // Exits script depending on save status
    if ( $is_autosave || $is_revision || !$is_valid_nonce ) {
        return;
    }

    // Checks for input and saves
    if( isset( $_POST[ 'meta-checkbox' ] ) ) {
        update_post_meta( $post_id, 'meta-checkbox', 'yes' );

    } else {
        update_post_meta( $post_id, 'meta-checkbox', '' );
    }

}
add_action( 'save_post', 'sm_meta_save' );

Topic featured-post next-post-link previous-post-link loop filters Wordpress

Category Web

sMyles · Accepted Answer · 2017年7月1日 01:20

Add this to your child theme's functions.php file to modify the main posts loop query:

add_action( 'pre_get_posts', 'smyles_main_query_custom_orderby' );
/**
 *  Modify main post query sort by meta key and date
 *
 * @param \WP_Query $query
 */
function smyles_main_query_custom_orderby( $query ) {

    // Verify query is main blog archive
    if ( $query->is_home() && $query->is_main_query() ) {
        $query->set( 'meta_key', 'meta-checkbox' );
        $query->set( 'orderby', array( 'meta_value' => 'DESC', 'date' => 'DESC' ) );
    }

}

https://codex.wordpress.org/Plugin_API/Action_Reference/pre_get_posts https://make.wordpress.org/core/2014/08/29/a-more-powerful-order-by-in-wordpress-4-0/

Your index.php file loop can then just look like this:

if ( have_posts() ) {

    while( have_posts() ) {

        the_post();

        $template = get_post_meta( get_the_ID(), 'meta-checkbox', true ) ? 'featured' : 'content';
        // This could have just been the code below had you used underscores like I previously mentioned
        // $template = $post->meta_checkbox ? 'featured' : 'content';

        // Load template part
        get_template_part( $template, get_post_format() );

    }
}

sMyles · Accepted Answer · 2017年7月1日 01:11

You should just do a new full query for all posts (not just featured ones), and set the orderby to meta_value and just check when doing the loop, if that post meta value is yes, and output the featured template, otherwise output standard one.

https://codex.wordpress.org/Class_Reference/WP_Query#Order_.26_Orderby_Parameters

UPDATE: Maybe something like this:

$args = array(
    'posts_per_page'    => - 1,
    'meta_key'          => 'meta-checkbox',
    'orderby'           => array( 'meta_value' => 'DESC', 'date'  =>  'DESC')

);

$posts = new WP_Query( $args );

if($posts->have_posts() ){

    while( $posts->have_posts() ){

        $posts->the_post();

        // Set to content template by default
        $template = 'content';

        // Change template to featured when `is_featured` meta has a value
        if(get_post_meta(get_the_ID(), 'meta-checkbox', true )){
            $template = 'featured';
        }

        // Load template part
        get_template_part( $template, get_post_format() );

    }
}

You will notice I changed the meta key to is_featured .. it's good practice to use underscores instead of hyphens.

To get the value for meta on the post, just use the $post object which has a __get PHP magic method which will return post meta if it exists.

http://php.net/manual/en/language.oop5.overloading.php#object.get

How to filter get previous post function by meta value DESC and post date DESC?

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