meraj.khattak on "Adding edit link to admin bar as sub menu"

Fixed this issue by using $wp_query->get_queried_object(); as the following in my code:

/**
 *  Add sub menu item to admin bar
 */
function custom_admin_bar_render() {
    global $wp_admin_bar;
    global $wp_query;
    $post_obj = $wp_query->get_queried_object();
    $post_id = $post_obj->ID;

    if ( is_single() )
        $wp_admin_bar->add_menu( array(
            'id' => 'edit',

            //here define the name of parent under which this link is required to appear
            'parent' => 'new-content',
            'title' => __( 'Edit'),
            'href' => get_edit_post_link($post_id)
        ) );
}

Hope this will help someone.