Reply To: get previous and next post link in post objects

• aryanraj

• May 4, 2023 at 12:16 pm

Yes, i already revised the code and this works:

function post_object_navigation_shortcode() {
	global $post;

	// get the post/page id where post object field is added.
	$course_id = get_field( 'lesson_of_course' );

	// get current post id, this can be also a post object.
	$current_post_link_id = get_the_ID();

	// get all the post_link sub field values.
	$post_objects = array();

	if ( have_rows( 'lesson_listing', $course_id ) ) :
		while ( have_rows( 'lesson_listing', $course_id ) ) :
			the_row();

			// check for rows (sub repeater)
			if ( have_rows( 'section_repeater', $course_id ) ) :

				while ( have_rows( 'section_repeater', $course_id ) ) :
					the_row();

					$my_field = get_sub_field( 'post_link' );
					if ( ! empty( $my_field ) ) {
						$post_objects[] = $my_field;
					}

				endwhile;
			endif;
		endwhile;
	endif;

	// get the current index of the current post object
	$current_index = array_search( $current_post_link_id, array_column( $post_objects, 'ID' ) );

	// output the previous post object title and link
	if ( $current_index > 0 ) {
		$previous_post = $post_objects[ $current_index - 1 ];
		$post = get_post( $previous_post );
		setup_postdata( $post );
		$title = get_the_title();
		$link = get_the_permalink();
		echo '<a href="' . esc_url( $link ) . '">' . esc_html( $title ) . '</a>';
	}

	// output the next post object title and link
	if ( $current_index < count( $post_objects ) - 1 ) {
		$next_post = $post_objects[ $current_index + 1 ];
		$post = get_post( $next_post );
		setup_postdata( $post );
		$title = get_the_title();
		$link = get_the_permalink();
		echo '<a href="' . esc_url( $link ) . '">' . esc_html( $title ) . '</a>';
	}

	wp_reset_postdata();
}
add_shortcode( 'lesson_navigation', 'post_object_navigation_shortcode' );