我在express中做了类似的事情来记录mongodb连接事件。

mongoose
  .connect(process.env.DATABASE, {
    useNewUrlParser: true,
    useFindAndModify: false
  })
  .then(() => console.log('connect to DB successfully :)'));

mongoose.connection.on('error', err => {
  console.log('DB connection failed');
});

mongoose.connection.on('disconnected', () => {
  console.log('DB disconnected');
});

mongoose.connection.on('reconnected', () => {
  console.log('DB reconnected');
});

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我想在Nest js中有这样的东西，但我不能这样做。下面是我连接到mongodb的nest js代码。

import { Module } from '@nestjs/common';
import { ConfigModule, ConfigService } from '@nestjs/config';
import { MongooseModule } from '@nestjs/mongoose';
import { AppController } from './app.controller';
import { AppService } from './app.service';

@Module({
  controllers: [AppController],
  providers: [AppService],
  imports: [
    MongooseModule.forRootAsync({
      imports: [ConfigModule],
      useFactory: async (configService: ConfigService) => ({
        uri: configService.get<string>('dbConnectionString'),
        user: configService.get<string>('DB_USER'),
        pass: configService.get<string>('DB_PASS')
      }),
      inject: [ConfigService]
    })
  ]
})
export class AppModule {}

型