Merge pull request #15869 from nextcloud/multiple-version-backends

fix loading multiple version backends from one app

apps/files_versions/lib/AppInfo/Application.php

@@ -65,25 +65,36 @@ class Application extends App {
 
 	public function registerVersionBackends() {
 		$server = $this->getContainer()->getServer();
-		$logger = $server->getLogger();
 		$appManager = $server->getAppManager();
-		/** @var IVersionManager $versionManager */
-		$versionManager = $this->getContainer()->getServer()->query(IVersionManager::class);
 		foreach($appManager->getInstalledApps() as $app) {
 			$appInfo = $appManager->getAppInfo($app);
 			if (isset($appInfo['versions'])) {
 				$backends = $appInfo['versions'];
 				foreach($backends as $backend) {
-					$class = $backend['@value'];
-					$for = $backend['@attributes']['for'];
-					try {
-						$backendObject = $server->query($class);
-						$versionManager->registerBackend($for, $backendObject);
-					} catch (\Exception $e) {
-						$logger->logException($e);
+					if (isset($backend['@value'])) {
+						$this->loadBackend($backend);
+					} else {
+						foreach ($backend as $singleBackend) {
+							$this->loadBackend($singleBackend);
+						}
 					}
 				}
 			}
 		}
 	}
+
+	private function loadBackend(array $backend) {
+		$server = $this->getContainer()->getServer();
+		$logger = $server->getLogger();
+		/** @var IVersionManager $versionManager */
+		$versionManager = $this->getContainer()->getServer()->query(IVersionManager::class);
+		$class = $backend['@value'];
+		$for = $backend['@attributes']['for'];
+		try {
+			$backendObject = $server->query($class);
+			$versionManager->registerBackend($for, $backendObject);
+		} catch (\Exception $e) {
+			$logger->logException($e);
+		}
+	}
 }