Move filter registration out of CPT constructor

lib/class-wp-json-customposttype.php

@@ -38,10 +38,18 @@ public function __construct(WP_JSON_ResponseHandler $server) {
 			return;
 		}
 
+		parent::__construct($server);
+	}
+
+	/**
+	 * Add actions and filters for the post type
+	 *
+	 * This method should be called after instantiation to automatically add the
+	 * required filters for the post type.
+	 */
+	public function register_filters() {
 		add_filter( 'json_endpoints', array( $this, 'register_routes' ) );
 		add_filter( 'json_post_type_data', array( $this, 'type_archive_link' ), 10, 2 );
-
-		parent::__construct($server);
 	}
 
 	/**

plugin.php

@@ -51,8 +51,7 @@ function json_api_default_filters($server) {
 
 	// Pages
 	$wp_json_pages = new WP_JSON_Pages($server);
-	add_filter( 'json_endpoints', array( $wp_json_pages, 'register_routes' ), 1 );
-	add_filter( 'json_post_type_data', array( $wp_json_pages, 'type_archive_link' ), 10, 2 );
+	$wp_json_pages->register_filters();
 
 	// Media
 	$wp_json_media = new WP_JSON_Media($server);