Reply To: True/False – Only allow one post to have true value

• KiwiCreative

• July 24, 2018 at 12:02 am

Hi John,

Thank you for your reply. I’m using ACF PRO, so ACF5. I switched out $_POST['fields'] with $_POST['acf'] but unfortunately my code is still not working. Saving an post as featured, doesn’t unset the featured option on a different post.

So my code now looks like:

function my_acf_save_post( $post_id ){
	
	$fields = false;
	
	if ( isset( $_POST['acf'] ) ) {
		$fieldId = 'field_5b51ec43f331a';
		$fields = $_POST['acf'];

		$featuredArticle = $fields[$fieldId];
		
		if ( $featuredArticle ) {
			$args = array(
				'post_type' => array('post'),
				'meta_query' => array(
					array(
						'key' => 'featured',
						'value' => '1',
						'compare' => '=='
					)
				)
			);
			
			$post_query = new WP_Query( $args );
			
			if ( $post_query->have_posts() ) {
				while ( $post_query->have_posts() ) {
					$post_query->the_post();
					
					acf_update_field( $fieldId, false, get_the_ID() );
					
				}
			}
		}
	}

} // end my_acf_save_post
add_action('acf/save_post', 'my_acf_save_post', 1);