BREAKING: use new backend syntax for limits

Author: minottic

src/app/datasource.service.ts

@@ -54,11 +54,13 @@ export class DatasourceService {
   ): string {
     return this.directMongoAccess
       ? JSON.stringify({
-          order: sortColumn + " " + sortDirection,
+        limits: {
           skip: itemsPerPage * currentPage,
           limit: itemsPerPage,
-          fields: itemFields,
-        })
+          order: sortColumn + ":" + sortDirection,
+        },
+        fields: itemFields,
+      })
       : "(" +
           "skip=" +
           itemsPerPage * currentPage +