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  • UPDATE: disregard this hack. See next post for a more complete solution.

    Ok so I’ve made a little progress on the concept of revisioning with acf_form() but is admittedly a hack. It will revision a post but for some reason, not until the 2nd change. I’m still working on it but I’m posting it here in hopes that someone else can expand on or replace with a more elegant solution.

    Basically I’m hijacking ‘pre_save_post’ and instead of letting it alter post meta for the existing post, I’m forcing the creation of a revision and letting acf act on that new post ID instead. Of course we still want the active post to get updated so I’m manually calling an un-documented acf function which obviously is a very bad approach.

    function my_pre_save_post( $post_id ) {
        // bail early if editing in admin
        if( is_admin() ) {
        // bail if this is a brand new post
        if ( ! is_numeric($post_id) ) {
          return $post_id;
        acf_save_post( $post_id );
        add_filter( 'wp_save_post_revision_check_for_changes', 'on_forced_revision', 10, 3 );
        $new_id = wp_save_post_revision( $post_id );
        remove_filter( 'wp_save_post_revision_check_for_changes', 'on_forced_revision', 10 );
        // return the new ID
        return $new_id;
    add_filter('acf/pre_save_post' , 'my_pre_save_post', 1, 2 );
    function on_forced_revision($check_for_changes, $last_revision, $post) {
      if( isset($_POST['_acfchanged']) && $_POST['_acfchanged'] == '1' )
        return false;
      return $check_for_changes;