Endpoint for purging all objects in class (#2032)

* Endpoint for purging all objects in class

* Use deleteObjectsByQuery

* Standalone handling function and purge cache

* Change endpoint url

src/Routers/FeaturesRouter.js

@@ -36,7 +36,7 @@ export class FeaturesRouter extends PromiseRouter {
           removeField: true,
           addClass: true,
           removeClass: true,
-          clearAllDataFromClass: false,
+          clearAllDataFromClass: true,
           exportClass: false,
           editClassLevelPermissions: true,
           editPointerPermissions: true,

src/Routers/PurgeRouter.js

@@ -0,0 +1,24 @@
+import PromiseRouter from '../PromiseRouter';
+import * as middleware from '../middlewares';
+
+export class PurgeRouter extends PromiseRouter {
+
+  handlePurge(req) {
+    return req.config.database.purgeCollection(req.params.className)
+    .then(() => {
+      var cacheAdapter = req.config.cacheController;
+      if (req.params.className == '_Session') {
+        cacheAdapter.user.clear();
+      } else if (req.params.className == '_Role') {
+        cacheAdapter.role.clear();
+      }
+      return {response: {}};
+    });
+  }
+
+  mountRoutes() {
+    this.route('DELETE',  '/purge/:className', middleware.promiseEnforceMasterKeyAccess, (req) => { return this.handlePurge(req); });
+  }
+}
+
+export default PurgeRouter;