fix

things/nest-typeorm/src/config.ts

 import { TypeOrmModuleOptions } from '@nestjs/typeorm';
 import { User } from './entities/User';
+import { Group } from './entities/Group';
 
 export function dbConfig() {
   return {
@@ -14,7 +15,7 @@ export function typeormConfig(): TypeOrmModuleOptions {
   return {
     name: 'app',
     type: 'mysql',
-    entities: [User], // entities here
+    entities: [User, Group], // entities here
     synchronize: true,
     ...dbConfig(),
   };