Reply To: No revision when update from front end

• JoelStransky

• May 5, 2016 at 10:47 am

Ok so I finally have something that so far appears to be pretty solid. It’s basically hooking into acf filters to trigger our own revision and then copying values over. This hasn’t been tested for creating NEW posts with acf_form, just editing them.

function my_pre_save_post( $post_id ) {
    // bail early if editing in admin
    // ACF already handles admin revisions correctly
    if( is_admin() ) {
      return $post_id;
    }
    // force a post update, this will generate a revision and
    // trigger the '_wp_put_post_revision' action
    wp_update_post( get_post($post_id) );
    // allow acf to update the parent post meta normally
    return $post_id;
}
add_filter('acf/pre_save_post' , 'my_pre_save_post' );

// revision just got created
// detect all of the acf fields on the original and
// apply them to the revision
function _on_wp_put_post_revision( $revision_id ) {
  // bail early if editing in admin
  if( is_admin() ) {
    return;
  }
  // get the revision post object
  $revision = get_post( $revision_id );
  // get the id of the original post
  $post_id  = $revision->post_parent;
  // A lot of this is copied from ACF's revision class
  // get all the post meta from the original post
  $custom_fields = get_post_custom( $post_id );
  if( !empty($custom_fields) ) {
    foreach( $custom_fields as $k => $v ) {
      // value is always an array
      $v = $v[0];
      // bail early if $value is not is a field_key
      if( !acf_is_field_key($v) ) {
        continue;
      }
      // remove prefix '_' field from reference
      $field_name = substr($k, 1);
      // update the field value using the POST value supplied in the form
      update_field($field_name, $_POST['acf'][$v], $revision_id);
      // add the reference key
      update_metadata('post', $revision_id, $k, $v);
    }
  }
}
add_action( '_wp_put_post_revision', '_on_wp_put_post_revision' );