How to enable REST API on custom post type without Gutenberg?

Question

I understand that you have to enable the REST API in order to use the Gutenberg block editor, because Gutenberg relies on it; however, I want to use the Classic Editor for a custom post type and still use the REST API. Is there another way to disable Gutenberg?

I am aware that setting show_in_rest to true in my register_post_type() function enables the REST API, but it also enables Gutenberg when I do.

Any suggestions are greatly appreciated.

Answer 1

This code should do the trick. You will just need to add the post type(s) to the line below.

function my_disable_gutenberg( $current_status, $post_type ) {

    // Disabled post types
    $disabled_post_types = array( 'book', 'movie' );

    // Change $can_edit to false for any post types in the disabled post types array
    if ( in_array( $post_type, $disabled_post_types, true ) ) {
        $current_status = false;
    }

    return $current_status;
}
add_filter( 'use_block_editor_for_post_type', 'my_disable_gutenberg', 10, 2 );