option-activation.php

option-activation.php

register_activation_hook( __FILE__, 'my_plugin_activation' );
function my_plugin_activation() {
  add_option( 'my_plugin_activation','just-activated' );
}

add_action( 'admin_init','my_plugin_initialize' );
function my_plugin_initialize() {
    if( is_admin() && get_option( 'my_plugin_activation' ) == 'just-activated' ) {
    delete_option( 'my_plugin_activation' );
        flush_rewrite_rules();
    }
}

add_action( 'init', 'my_custom_post_type' );
function my_custom_post_type() {
    $args = array(
      'public' => true,
      'label'  => 'Board Games'
    );
    register_post_type( 'boardgames', $args );
}