迁移错误修复

database/migrations/2021_01_06_114158_create_station_task_children2.php

@@ -24,7 +24,7 @@ class CreateStationTaskChildren2 extends Migration
         Schema::table('station_tasks', function (Blueprint $table) {
             $table->dropColumn('station_taskable_type');
             $table->dropColumn('station_taskable_id');
-            $table->dropIndex('station_taskable_type');
+//            $table->dropIndex('station_taskable_type');
         });
     }