Product CPT

<?php
add_action('init', 'wlg_cstm_register');

 function wlg_cstm_register() {

    $product_labels = array(
    'name' => _x('Products', 'post type general name'),
    'singular_name' => _x('product', 'post type singular name'),
    'add_new' => _x('Add New', 'product'),
    'add_new_item' => __('Add New Products'),
    'edit_item' => __('Edit Products'),
    'new_item' => __('New product'),
    'view_item' => __('View Products'),
    'search_items' => __('Search Products'),
    'not_found' =>  __('No Products found'),
    'not_found_in_trash' => __('No Products found in Trash'),
    'parent_item_colon' => ''
);

    $product_args = array(
         'labels' => $product_labels,
         'public' => true,
         'show_ui' => true,
         'capability_type' => 'post',
         'hierarchical' => false,
         'rewrite' => true,
         'supports' => array('title', 'editor', 'thumbnail'),
        'taxonomies' => array( '' ),
        'menu_icon' => get_bloginfo('template_directory') . '/images/products-icon.png',  // Icon Path
        'has_archive' => true
        );


     register_post_type( 'product' , $product_args );
     register_taxonomy( 'brands', 'product', array( 'hierarchical' => true, 'label' => __('Product Brands'), 'query_var' => 'brands' ) );
 }

 add_action("admin_init", "admin_init");
add_action('save_post', 'save_points', 1, 2);
function admin_init(){
  add_meta_box("productInfo-meta", "Product Details", "product_meta_options", 'product', "normal", "high");
}

function product_meta_options(){
  global $post;
  $custom = get_post_custom($post->ID);
  $category = (!empty($custom["_category"][0])) ? $custom["_category"][0] : '';
  $brand = (!empty($custom["_brand"][0])) ? $custom["_brand"][0]  : '';
  $id = (!empty($custom["_productid"][0])) ? $custom["_productid"][0] : '';
  $features = (!empty($custom["_features"][0])) ? $custom["_features"][0]  : '';
  $holds = (!empty($custom["_holds"][0])) ? $custom["_holds"][0]  : '';
?>
<table>
    <tr>
        <td>Category</td>
        <td> <input type="text" size="100" name="category" value="<?php echo $category; ?>" /> </td>
    </tr>
    <tr>
        <td>Brand</td>
        <td> <input type="text" size="100" name="brand" value="<?php echo $brand; ?>" /> </td>
    </tr>
    <tr>
        <td>Product ID</td>
        <td> <input type="text" size="100" name="productid" value="<?php echo $productid; ?>" /> </td>
    </tr>
    <tr>
        <td>Features</td>
        <td><?php wp_editor( $features, 'features', $settings = array('textarea_rows'=>20) ); ?></td>
    </tr>
    <tr>
        <td>Holds</td>
        <td><?php wp_editor( $holds, 'holds', $settings = array('textarea_rows'=>20) ); ?></td>
    </tr>
</table>

<?php
}

function save_points($postid,$post){
  global $_POST;
  // set the ID to the parent post, not the revision
  $postid = (wp_is_post_revision( $postid )) ? wp_is_post_revision( $post ) : $postid;
  $post_type = get_post_type( $postid );
  if ('product' == $post_type) {
    update_post_meta($postid, "_category", $_POST["category"]);
    update_post_meta($postid, "_brand", $_POST["brand"]);
    update_post_meta($postid, "_productid", $_POST["productid"]);
    update_post_meta($postid, "_features", $_POST["features"]);
    update_post_meta($postid, "_holds", $_POST["holds"]); // save the data
  }
}



function todo_restrict_manage_posts() {
    global $typenow;
    $args=array( 'public' => true, '_builtin' => false );
    $post_types = get_post_types($args);
    if ( in_array($typenow, $post_types) ) {
    $filters = get_object_taxonomies($typenow);
        foreach ($filters as $tax_slug) {
            $tax_obj = get_taxonomy($tax_slug);
            wp_dropdown_categories(array(
                'show_option_all' => __('Show All '.$tax_obj->label ),
                'taxonomy' => $tax_slug,
                'name' => $tax_obj->name,
                'orderby' => 'term_order',
                'selected' => $_GET[$tax_obj->query_var],
                'hierarchical' => $tax_obj->hierarchical,
                'show_count' => false,
                'hide_empty' => true
            ));
        }
    }
}
function todo_convert_restrict($query) {
    global $pagenow;
    global $typenow;
    if ($pagenow=='edit.php') {
        $filters = get_object_taxonomies($typenow);
        foreach ($filters as $tax_slug) {
            $var = &$query->query_vars[$tax_slug];
            if ( isset($var) ) {
                $term = get_term_by('id',$var,$tax_slug);
                $var = $term->slug;
            }
        }
    }
    return $query;
}
add_action( 'restrict_manage_posts', 'todo_restrict_manage_posts' );
add_filter('parse_query','todo_convert_restrict');


add_filter( 'manage_edit-product_columns', 'my_columns' );
function my_columns( $columns ) {
    $columns['brands'] = 'Brands';
    $columns['category'] = 'Category';
    unset( $columns['comments'] );
    return $columns;
}
add_action( 'manage_posts_custom_column', 'populate_columns' );
function populate_columns( $column ) {
    if ( 'brands' == $column ) {
        $brand = esc_html( get_post_meta( get_the_ID(), 'brand', true ) );
        echo $brand;
    }
    elseif ( 'category' == $column ) {
        $category = get_post_meta( get_the_ID(), 'category', true );
        echo $category;
    }
}