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I am trying to enable revisions for an existing custom post type. As the post type was already created about 2 years ago so where the post type was register I added revisions to the supports array.

Earlier my code was like:

   $labels = array(
    'name' => 'Products',
    'singular_name' => 'Product',
    'all_items' => 'All Products',      
    'add_new' => 'Add New',
    'add_new_item' => 'Add New Product',
    'edit_item' => 'Edit Products',
    'new_item' => 'New Product',
    'view_item' => 'View Product',
    'search_items' => 'Search Products',
    'not_found' =>  'No Prducsts Found',
    'not_found_in_trash' => 'No Products in Trash', 
    'parent_item_colon' => ''
  );
  $supports = array(
    'title',
    'custom-fields',
    'editor',
    'thumbnail'
  );
  $args = array(
    'labels' => $labels,
    'public' => true,
    'menu_position' => 5,
    'rewrite' => array( 'slug' => 'products' ),
    'has_archive' => true,
    'supports' => $supports 
  ); 
  register_post_type('products', $args);

And now it looks like:

   $labels = array(
    'name' => 'Products',
    'singular_name' => 'Product',
    'all_items' => 'All Products',      
    'add_new' => 'Add New',
    'add_new_item' => 'Add New Product',
    'edit_item' => 'Edit Products',
    'new_item' => 'New Product',
    'view_item' => 'View Product',
    'search_items' => 'Search Products',
    'not_found' =>  'No Prducsts Found',
    'not_found_in_trash' => 'No Products in Trash', 
    'parent_item_colon' => ''
  );
  $supports = array(
    'title',
    'custom-fields',
    'editor',
    'thumbnail',
    'revisions'
  );
  $args = array(
    'labels' => $labels,
    'public' => true,
    'menu_position' => 5,
    'rewrite' => array( 'slug' => 'products' ),
    'has_archive' => true,
    'supports' => $supports 
  ); 
  register_post_type('products', $args);

This code didn't enable revisions in the custom post type.

Then I found another code which I added to my theme's function.php:

function add_revisions_custom_post()
{
    add_post_type_support( 'products', 'revisions' );
}
add_action('init','add_revisions_custom_post');

This one is also not working.

Can anyone suggest me how I can enable revisions?

Thanks in advance.

EDIT: Here is my wp-config.php file.

<?php
/**
 * The base configurations of the WordPress.
 *
 * This file has the following configurations: MySQL settings, Table Prefix,
 * Secret Keys, WordPress Language, and ABSPATH. You can find more information
 * by visiting {@link http://codex.wordpress.org/Editing_wp-config.php Editing
 * wp-config.php} Codex page. You can get the MySQL settings from your web host.
 *
 * This file is used by the wp-config.php creation script during the
 * installation. You don't have to use the web site, you can just copy this file
 * to "wp-config.php" and fill in the values.
 *
 * @package WordPress
 */

// ** MySQL settings - You can get this info from your web host ** //
/** The name of the database for WordPress */
define('WP_MEMORY_LIMIT', '64MB');

define('DB_NAME', 'MYDBNAME');

/** MySQL database username */
define('DB_USER', 'MYDBUSER');

/** MySQL database password */
define('DB_PASSWORD', 'MYDBPASSWORD');

/** MySQL hostname */
define('DB_HOST', 'localhost');

/** Database Charset to use in creating database tables. */
define('DB_CHARSET', 'utf8');

/** The Database Collate type. Don't change this if in doubt. */
define('DB_COLLATE', '');

define('WP_MEMORY_LIMIT', '64MB');

/**#@+
 * Authentication Unique Keys and Salts.
 *
 * Change these to different unique phrases!
 * You can generate these using the {@link https://api.wordpress.org/secret-key/1.1/salt/ WordPress.org secret-key service}
 * You can change these at any point in time to invalidate all existing cookies. This will force all users to have to log in again.
 *
 * @since 2.6.0
 */
define('AUTH_KEY',         'c7ypbekexsfbt4wiucppwewene93cbtcfhf6xgpggepycabhildsoyqpre5iv3wi');
define('SECURE_AUTH_KEY',  'ujjxufvylpndsj0qeuwa90gxawj3cgaqnyusrdbmujmb08r37pnyreorpcyxqouu');
define('LOGGED_IN_KEY',    'vwlhlmenthgrq9g5jcocihz4ndldhrpegmcp6qyb3rfmjvxjejbacv1zharaexlp');
define('NONCE_KEY',        'qhnyqgmqckh3ylasveugagqlvifiuqajl6s9e7ulfrxepdxh2mewr8qhdinua8o2');
define('AUTH_SALT',        'rlb723gcatjvkfrd3jscmvdjio3kx9apm5yie9e4ibxktnnlukvgfpgbdsohrns9');
define('SECURE_AUTH_SALT', 'pllenyye8zbtml91hekptc2clqr7bhvhlriecz5qozexfhiqptmcvxrlehj44c16');
define('LOGGED_IN_SALT',   '9lyqc6qod0zdgyh6esp7bsxmpmuyp3h64m62pcnwxyefejh6tjykm7tpxhecg3xy');
define('NONCE_SALT',       'ob0bq3fye46rubbgu5flycjuai4ygxqgxho8bb1k8t81mwhghcbkysrgxrjzx0fu');

/**#@-*/

/**
 * WordPress Database Table prefix.
 *
 * You can have multiple installations in one database if you give each a unique
 * prefix. Only numbers, letters, and underscores please!
 */
$table_prefix = 'wp_';

/**
 * WordPress Localized Language, defaults to English.
 *
 * Change this to localize WordPress.  A corresponding MO file for the chosen
 * language must be installed to wp-content/languages. For example, install
 * de_DE.mo to wp-content/languages and set WPLANG to 'de_DE' to enable German
 * language support.
 */
define ('WPLANG', '');

/**
 * For developers: WordPress debugging mode.
 *
 * Change this to true to enable the display of notices during development.
 * It is strongly recommended that plugin and theme developers use WP_DEBUG
 * in their development environments.
 */
define('WP_DEBUG', false);

/* That's all, stop editing! Happy blogging. */

/** Absolute path to the WordPress directory. */
if ( !defined('ABSPATH') )
    define('ABSPATH', dirname(__FILE__) . '/');

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');
0
$cap_type = 'post';
$plural = 'Products';
$single = 'Product';
$cpt_name = 'products';

$opts['supports'] = array( 'products', 'title', 'editor', 'thumbnail', 'author', 'revisions' );
$opts['can_export'] = TRUE;
$opts['capability_type'] = $cap_type;
$opts['description'] = '';
$opts['exclude_from_search'] = FALSE;
$opts['has_archive'] = TRUE;
$opts['hierarchical'] = TRUE;
$opts['map_meta_cap'] = TRUE;
$opts['menu_icon'] = 'dashicons-products';
$opts['menu_position'] = 2;
$opts['public'] = TRUE;
$opts['publicly_queryable'] = TRUE;
$opts['query_var'] = TRUE;
$opts['register_meta_box_cb'] = '';
$opts['rewrite'] = array('slug'=>'products', 'with_front'=>false);
$opts['show_in_admin_bar'] = TRUE;
$opts['show_in_menu'] = TRUE;
$opts['show_in_nav_menu'] = TRUE;

$opts['labels']['add_new'] = esc_html__( "Add New", 'wisdom' );
$opts['labels']['add_new_item'] = esc_html__( "Add New {$single}", 'wisdom' );
$opts['labels']['all_items'] = esc_html__( "All {$plural}", 'wisdom' );
$opts['labels']['edit_item'] = esc_html__( "Edit {$single}" , 'wisdom' );
$opts['labels']['menu_name'] = esc_html__( $plural, 'wisdom' );
$opts['labels']['name'] = esc_html__( $plural, 'wisdom' );
$opts['labels']['name_admin_bar'] = esc_html__( $single, 'wisdom' );
$opts['labels']['new_item'] = esc_html__( "New {$single}", 'wisdom' );
$opts['labels']['not_found'] = esc_html__( "No {$single} found", 'wisdom');
$opts['labels']['not_found_in_trash'] = esc_html__( "Not found {$plural} in Trash", 'wisdom' );
$opts['labels']['parent_item_colon'] = esc_html__( "Parent {$plural} :", 'wisdom' );
$opts['labels']['search_items'] = esc_html__( "Search {$plural}", 'wisdom' );
$opts['labels']['singular_name'] = esc_html__( $single, 'wisdom' );
$opts['labels']['view_item'] = esc_html__( "View {$single}", 'wisdom' );
register_post_type( strtolower( $cpt_name ), $opts );

try this

  • :( It's not working.. – Thomas Sep 29 '18 at 7:48
  • are you sure you don't have revisions turned off? be sure this does not exist in wp-config.php: define('WP_POST_REVISIONS', false); – Dhimas Ulung Pamungkas Sep 29 '18 at 8:01
  • yes, I did check this. and it's not in my wp-config.php – Thomas Sep 29 '18 at 8:02
  • Have you check on a page/post edit panel? click on "Screen Options" in the top right and look for a "Revisions" checkbox and make sure it is active – Dhimas Ulung Pamungkas Sep 29 '18 at 8:07
  • Yes, I checked that too. In screen options, there is no option to show revisions. I just want to confirm one thing that if I added the revisions to the supports array of custom post type then will it affect the data which is already added to the posts? – Thomas Sep 29 '18 at 8:13

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