create-nest-template-malahimdev/template/src/app.module.ts

Scaffolds a NestJS template with Swagger, global pipes, exception filters, MongoDB connection and response helpers.

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

@Module({
  imports: [
    ConfigModule.forRoot({ isGlobal: true }),
    MongooseModule.forRootAsync({
      useFactory: (config: ConfigService) => ({
        uri: config.get<string>('MONGO_URI') || 'mongodb://127.0.0.1:27017/mydb',
      }),
      inject: [ConfigService],
    }),
  ],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule implements OnModuleInit {
  constructor(@InjectConnection() private readonly connection: Connection) {}

 async onModuleInit() {
  if (this.connection.readyState === 1) {
    console.log('✅ MongoDB already connected');
  } else {
    console.log('⏳ MongoDB connecting... current state:', this.connection.readyState);
  }

  this.connection.on('connected', () => {
    console.log('✅ MongoDB connected');
  });

  this.connection.on('error', (err) => {
    console.error('❌ MongoDB connection error:', err);
  });

  this.connection.on('disconnected', () => {
    console.warn('⚠️ MongoDB disconnected');
  });
}
}