Merge pull request #179 from wp-graphql/fix/#176-fatal-error-for-comp…

…oser-installs

fix: prevent error when users install the plugin from Composer

src/Cache/Invalidation.php

@@ -30,7 +30,6 @@ public function __construct( Collection $collection ) {
 	 * Initialize the actions to listen for
 	 */
 	public function init() {
-
 		// @phpcs:ignore
 		do_action( 'graphql_cache_invalidation_init', $this );
 

wp-graphql-smart-cache.php

@@ -38,7 +38,12 @@
 const WPGRAPHQL_REQUIRED_MIN_VERSION = '1.2.0';
 const WPGRAPHQL_SMART_CACHE_VERSION  = '0.3.1';
 
-require __DIR__ . '/vendor/autoload.php';
+// If the autoload file exists, require it.
+// If the plugin was installed from composer, the autoload
+// would be required elsewhere in the project
+if ( file_exists( __DIR__ . '/vendor/autoload.php' ) ) {
+	require __DIR__ . '/vendor/autoload.php';
+}
 
 if ( ! defined( 'WPGRAPHQL_SMART_CACHE_PLUGIN_DIR' ) ) {
 	define( 'WPGRAPHQL_SMART_CACHE_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
@@ -58,6 +63,11 @@ function can_load_plugin() {
 		return false;
 	}
 
+	// If the Document class doesn't exist, then the autoloader failed to load
+	if ( ! class_exists( Document::class ) ) {
+		return false;
+	}
+
 	// Do we have a WPGraphQL version to check against?
 	if ( empty( defined( 'WPGRAPHQL_VERSION' ) ) ) {
 		return false;