Fix entity import

The entity should be imported manually, as the manual states.

Author: paolomainardi

sample/13-mongo-typeorm/src/app.module.ts

@@ -2,14 +2,15 @@ import { Module } from '@nestjs/common';
 import { TypeOrmModule } from '@nestjs/typeorm';
 import { join } from 'path';
 import { PhotoModule } from './photo/photo.module';
+import { Photo } from './photo/photo.entity';
 
 @Module({
   imports: [
     TypeOrmModule.forRoot({
       type: 'mongodb',
       host: 'localhost',
       database: 'test',
-      entities: [join(__dirname, '**/**.entity{.ts,.js}')],
+      entities: [Photo],
       synchronize: true,
     }),
     PhotoModule,