Migrate and fix GlobalConfig database storage.

src/Routers/GlobalConfigRouter.js

@@ -1,38 +1,28 @@
 // global_config.js
 
-var Parse = require('parse/node').Parse;
-
 import PromiseRouter from '../PromiseRouter';
 import * as middleware from "../middlewares";
 
 export class GlobalConfigRouter extends PromiseRouter {
   getGlobalConfig(req) {
-    return req.config.database.rawCollection('_GlobalConfig')
-      .then(coll => coll.findOne({'_id': 1}))
-      .then(globalConfig => ({response: { params: globalConfig.params }}))
-      .catch(() => ({
-        status: 404,
-        response: {
-          code: Parse.Error.INVALID_KEY_NAME,
-          error: 'config does not exist',
+    return req.config.database.adaptiveCollection('_GlobalConfig')
+      .then(coll => coll.find({ '_id': 1 }, { limit: 1 }))
+      .then(results => {
+        if (results.length != 1) {
+          // If there is no config in the database - return empty config.
+          return { response: { params: {} } };
         }
-      }));
+        let globalConfig = results[0];
+        return { response: { params: globalConfig.params } };
+      });
   }
+
   updateGlobalConfig(req) {
-    return req.config.database.rawCollection('_GlobalConfig')
-      .then(coll => coll.findOneAndUpdate({ _id: 1 }, { $set: req.body }))
-      .then(response => {
-        return { response: { result: true } }
-      })
-      .catch(() => ({
-        status: 404,
-        response: {
-          code: Parse.Error.INVALID_KEY_NAME,
-          error: 'config cannot be updated',
-        }
-     }));
+    return req.config.database.adaptiveCollection('_GlobalConfig')
+      .then(coll => coll.upsertOne({ _id: 1 }, { $set: req.body }))
+      .then(() => ({ response: { result: true } }));
   }
-  
+
   mountRoutes() {
     this.route('GET', '/config', req => { return this.getGlobalConfig(req) });
     this.route('PUT', '/config', middleware.promiseEnforceMasterKeyAccess, req => { return this.updateGlobalConfig(req) });