而docs state:

请注意，API不能阻止您更改响应，但代码的结构强烈阻止了这一点。内部，field registration is powered by filters, 和these can be used if you absolutely have no other choice.

那里IS 大多数情况下的另一种选择，即：custom endpoints/routes.

您甚至可以将rest控制器类分配给CPT。所以你可以扩展WP_Rest_Posts_Controller 和设置custom endpoints, their routes, 参数，以及相应的回调以响应您所需的任何内容。

涉及的步骤包括：

设置rest_controller_class 对于自定义帖子类型（CPT）

注意：WP_REST_Posts_Controller 自身正在扩展WP_REST_Controller.

设置rest_controller_class CPT的参数：

1）In$args 注册时的数组：

    $labels = array( ... );
    $args = array(
                \'labels\'                => $labels,
                ...
                ...
                \'show_in_rest\'          => true,
                \'rest_base\'             => \'my_rest_base\',
              //\'rest_controller_class\' => \'WP_REST_Posts_Controller\',
                \'rest_controller_class\' => \'My_CPT_Controller_Class\'
              );
    register_post_type( \'my-post-type\', $args );

2）注册CPT后要添加，请使用过滤器挂钩：register_post_type_args

function add_rest_stuff( $args, $post_type ) {
    $custom_post_type = \'my-post-type\';

    if ( $post_type !== $custom_post_type ) {
     return $args;
    }

    $args[\'show_in_rest\'] = true;
    $args[\'rest_base\'] = \'my_rest_base\';
    $args[\'rest_controller_class\'] = \'My_CPT_Controller_Class\';

    return $args;
}
add_filter(\'register_post_type_args\', \'make_it_public\' ); 

延伸WP_REST_Controller 对于自定义端点/路由：

作为起点的快速部分示例（从previous answer)

    class My_CPT_Controller_Class extends WP_REST_Controller {
            public function __construct() {
                add_action( \'rest_api_init\', array( $this, \'register_routes\' ) );
            }//end __construct

            public function register_routes() {
                $version = \'1\';
                $namespace = \'my-fancy-namespace/v\' . $version; 
                $base = \'my-route-base\';

    // so, site.com/wp-json/my-fancy-namespace/v1/my-route-base/

                register_rest_route( $namespace, \'/\'. $base, array(
                    array(
                        \'methods\'  => \'GET\',
                        \'callback\' => array( $this, \'my_get_callback\' ),
                        \'permission_callback\' => array( $this, \'key_permissions_check\' ),
                        ),
                    array(
                        \'methods\'  => \'POST\',
                        \'callback\' => array( $this, \'my_post_callback\' ),
                        \'permission_callback\' => array( $this, \'key_permissions_check\' ),
                        ),)
                );

                $base2 = \'my-second-base\';
    // so, site.com/wp-json/my-fancy-namespace/v1/my-second-base/

                register_rest_route( $namespace, \'/\'. $base2, array(
                    array(
                        \'methods\'  => \'GET\',
                        \'callback\' => array( $this, \'my_get_callback_two\' ),
                        \'permission_callback\' => array( $this, \'key_permissions_check\' ),
                        ),
                    array(
                        \'methods\'  => \'POST\',
                        \'callback\' => array( $this, \'my_post_callback_two\' ),
                        \'permission_callback\' => array( $this, \'key_permissions_check\' ),
                        ),)
                );

        }//register_routes

       public function key_permissions_check() {
          //do permissions check stuff
       }

       public function my_get_callback( WP_REST_Request $request ) {

            //do stuff with $request 
           //see the methods mentioned below
        }//end 
    }//end class

TheWP_Rest_Request class provides several methods 用于处理$request.

模式查看Schema 以及建立响应。

我添加了prefix_get_comment() 该页底部的示例，因为这是一个简单的示例：

function prefix_register_my_comment_route() {
    register_rest_route( \'my-namespace/v1\', \'/comments\', array(
        // Notice how we are registering multiple endpoints the \'schema\' equates to an OPTIONS request.
        array(
            \'methods\'  => \'GET\',
            \'callback\' => \'prefix_get_comment_sample\',
        ),
        // Register our schema callback.
        \'schema\' => \'prefix_get_comment_schema\',
    ) );
}
/**
 * Get our sample schema for comments.
 */
function prefix_get_comment_schema() {
    $schema = array(
        // This tells the spec of JSON Schema we are using which is draft 4.
        \'$schema\'              => \'http://json-schema.org/draft-04/schema#\',
        // The title property marks the identity of the resource.
        \'title\'                => \'comment\',
        \'type\'                 => \'object\',
        // In JSON Schema you can specify object properties in the properties attribute.
        \'properties\'           => array(
            \'id\' => array(
                \'description\'  => esc_html__( \'Unique identifier for the object.\', \'my-textdomain\' ),
                \'type\'         => \'integer\',
                \'context\'      => array( \'view\', \'edit\', \'embed\' ),
                \'readonly\'     => true,
            ),
            \'author\' => array(
                \'description\'  => esc_html__( \'The id of the user object, if author was a user.\', \'my-textdomain\' ),
                \'type\'         => \'integer\',
            ),
            \'content\' => array(
                \'description\'  => esc_html__( \'The content for the object.\', \'my-textdomain\' ),
                \'type\'         => \'string\',
            ),
        ),
    );

    return $schema;
}