+ return false
+}
+
+function checkSort (sortableColumns: string[]) {
+ return [
+ query('sort').optional().isIn(sortableColumns).withMessage('Should have correct sortable column'),
+
+ (req: express.Request, res: express.Response, next: express.NextFunction) => {
+ logger.debug('Checking sort parameters', { parameters: req.query })
+
+ if (areValidationErrors(req, res)) return
+
+ return next()
+ }
+ ]
+}
+
+function createSortableColumns (sortableColumns: string[]) {
+ const sortableColumnDesc = sortableColumns.map(sortableColumn => '-' + sortableColumn)
+
+ return sortableColumns.concat(sortableColumnDesc)