ACF backend cache

• boram.kim

• June 18, 2016 at 3:45 am

Are there any ACF-specific keys/group to be cleared with regard to caching?

We have Redis setup as the backend cache for WordPress. In most all cases, when an ACF field is edited on a post, the changes do not show up until the cache is flushed. I think it’s acceptable to flush specific groups or target a specific key, but it doesn’t seem logical to have to flush the entire cache for WordPress.

Current logic is something like this.

	add_filter( 'acf/save_post', 'acf_clear_object_cache' );

	/**
	 * Intended to clear a post's cache
	 */
	public function acf_clear_object_cache( $post_id ) {
		if ( empty( $_POST['acf'] ) ) {
			return;
		}
		
		// clear post related cache
		clean_post_cache( $post_id );
		
		// clear ACF cache
		$acf_cache_cleared = wp_cache_delete( 'acf-post', 'acf' );
		
		// clear all cache if no specific key/group is found
		if ( !$acf_cache_cleared ) {
			wp_cache_flush();
		}
	}

• boram.kim

• June 18, 2016 at 5:00 am

After doing some digging in your ACF code, I may have a more targeted solution from the acf_get_value() function. This is untested, but assuming this is where the value is cached, it should easily be cleared on post update hook.

	public function acf_clear_object_cache( $post_id ) {
		if ( empty( $_POST['acf'] ) ) {
			return;
		}
		
		// clear post related cache
		clean_post_cache( $post_id );
		
		// clear ACF cache
		if ( is_array( $_POST['acf'] ) ) {
			foreach ( $_POST['acf'] as $field_name => $value ) {
				$cache_slug = "load_value/post_id={$post_id}/name={$field_name}";
				wp_cache_delete( $cache_slug, 'acf' );
			}
		}
	}