• wavesnshapes

• in reply to: Auto-populate Custom Post Excerpt with one or multiple Custom Field(s)
• February 19, 2024 at 9:15 pm

Hi John,

Thank you for pointing me to the right direction but i actually got it working with the solution below. When i edit the custom field value and just click save, the excerpt gets updated as well.

Would you still recommend that i use the acf/save_post method?

function update_custom_post_excerpt_with_acf_field( $post_id ) {
    // Ensure ACF is loaded
    if (function_exists('get_field')) {
        // Check if this is a post of your custom post type and not an autosave.
        if ( get_post_type( $post_id ) === 'watercraft' && ! wp_is_post_autosave( $post_id ) && ! wp_is_post_revision( $post_id ) ) {
            // Get the value of the custom field using ACF's get_field function.
            $custom_field_value = get_field( 'watercraft_stock_number', $post_id );

            // Check if the custom field value is not empty.
            if ( ! empty( $custom_field_value ) ) {
                // Prepare an array to update the post excerpt.
                $post_data = array(
                    'ID'           => $post_id,
                    'post_excerpt' => $custom_field_value,
                );

                // Update the post excerpt without triggering an infinite loop.
                remove_action( 'save_post', 'update_custom_post_excerpt_with_acf_field' );
                wp_update_post( $post_data );
                add_action( 'save_post', 'update_custom_post_excerpt_with_acf_field' );
            }
        }
    }
}

// Hook into the save_post action.
add_action( 'save_post', 'update_custom_post_excerpt_with_acf_field' );

• wavesnshapes

• in reply to: Auto-populate Custom Post Excerpt with one or multiple Custom Field(s)
• February 18, 2024 at 9:42 am

Also i believe there is very close answer to what i need: on stack exchange

The following code auto-populates the post_excerpt whenever a post is created or saved, if it had no previous excerpt.
Note that the excerpt creation can be greatly improved, as it doesn’t differentiates Urls nor short words.

// Define the custom excerpt length
$wpse_40574_custom_excerpt_length = 15;

add_filter( 'wp_insert_post_data', 'wpse_40574_populate_excerpt', 99, 2 );

/** 
 * Checks if the the post has excerpt or not
 * Code reference: https://wordpress.stackexchange.com/a/52897/12615
 */
// 
function wpse_40574_populate_excerpt( $data, $postarr ) 
{   
    global $wpse_40574_custom_excerpt_length;
    
    // check if it's a valid call
    if ( !in_array( $data['post_status'], array( 'draft', 'pending', 'auto-draft' ) ) && 'post' == $data['post_type'] ) 
    {
        // if the except is empty, call the excerpt creation function
        if ( strlen($data['post_excerpt']) == 0 ) 
            $data['post_excerpt'] = wpse_40574_create_excerpt( $data['post_content'], $wpse_40574_custom_excerpt_length );
    }

    return $data;
}

/** 
 * Returns the original content string if its word count is lesser than $length, 
 * or a trimed version with the desired length.
 * Reference: see this StackOverflow Q&A - http://stackoverflow.com/q/11521456/1287812
 */
function wpse_40574_create_excerpt( $content, $length = 20 )
{
    $the_string = preg_replace( '#\s+#', ' ', $content );
    $words = explode( ' ', $the_string );

    /**
     * The following is a more efficient way to split the $content into an array of words
     * but has the caveat of spliting Url's into words ( removes the /, :, ., charachters )
     * so, not very useful in this context, could be improved though.
     * Note that $words[0] has to be used as the array to be dealt with (count, array_slice)
     */
    //preg_match_all( '/\b[\w\d-]+\b/', $content, $words );

    if( count($words) <= $length ) 
        $result = $content;
    else
        $result = implode( ' ', array_slice( $words, 0, $length ) );

    return $result;
}

Note
Example of default_excerpt filter usage:

add_filter( 'default_excerpt', 'wpse_40574_excerpt_content', 10, 2 );

function wpse_40574_excerpt_content(  $post_excerpt, $post  ) 
{
    // Do nothing if not the correct post type
    // http://codex.wordpress.org/Post_Types
    if( 'post' != $post->post_type )
        return;
        
    $post_excerpt = "DEFAULT EXCERPT FOR POSTS OF THE TYPE -POST-";

    return $post_excerpt;
}