fix backup handler destory loop

Author: Xziy

libs/BackupHandler.js

@@ -106,7 +106,7 @@ class BackupHandler {
                 options.concepts.push("origin");
             if (options.concepts.length && options.turncate) {
                 console.log(`Truncating concepts: ${options.concepts.join(', ')}`);
-                for (let concept in options.concepts) {
+                for (let concept of options.concepts) {
                     await Dish.destroy({ concept: concept }).fetch();
                     await Group.destroy({ concept: concept }).fetch();
                     console.log(`Destroyed concept: ${concept}`);

libs/BackupHandler.ts

@@ -113,7 +113,7 @@ export class BackupHandler {
       if (!options.concepts.length) options.concepts.push("origin");
       if (options.concepts.length && options.turncate) {
         console.log(`Truncating concepts: ${options.concepts.join(', ')}`);
-        for (let concept in options.concepts) {
+        for (let concept of options.concepts) {
           await Dish.destroy({ concept: concept }).fetch();
           await Group.destroy({ concept: concept }).fetch();
           console.log(`Destroyed concept: ${concept}`);