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mcaskill/acf-preview-changes-when-revisions-disabled.php

Created May 24, 2023 21:48
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  1. mcaskill created this gist May 24, 2023.
    46 changes: 46 additions & 0 deletions acf-preview-changes-when-revisions-disabled.php
    View file
    Original file line number Diff line number Diff line change
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    <?php

    /**
    * Ensure ACF fields can be previewed when post revisions are disabled
    * (`WP_POST_REVISIONS`).
    *
    * @listens action:wp_revisions_to_keep
    * Filters the number of revisions to save for the given post.
    */
    add_filter( 'wp_revisions_to_keep', function ( int $num, WP_Post $post ) : int {
    // Bail early if post revisions enabled.
    if ( WP_POST_REVISIONS ) {
    return $num;
    }

    // Bail early if the post type is not supported.
    if ( ! post_type_supports( $post->post_type, 'revisions' ) ) {
    return $num;
    }

    // Bail early if not previewing post.
    if (
    ! is_preview() ||
    empty( $_GET['preview_id'] )
    ) {
    return $num;
    }

    $preview_id = (int) $_GET['preview_id'];

    // Bail early if not previewing this post.
    if ( $preview_id !== $post->ID ) {
    return $num;
    }

    // Bail early if not currently filtering the post ID
    // for ACF to fetch from its latest revision.
    if (
    ! doing_filter( 'wp_revisions_to_keep' ) ||
    ! doing_filter( 'acf/validate_post_id' )
    ) {
    return $num;
    }

    return 1;
    }, 10, 2 );