nestjs - Nestjs：无法异步连接mongo

Question

我无法异步连接到 mongodb。请让我知道我做错了什么。

MongoConfig文件：

import { MongooseModuleOptions } from '@nestjs/mongoose';

export default (): { mongoConfig: MongooseModuleOptions } => ({
  mongoConfig: {
    uri: process.env.DB_URI,
    connectionName: 'learn-nest',
    useCreateIndex: true,
    useUnifiedTopology: true,
    useFindAndModify: false,
    useNewUrlParser: true,
  },
});

这是在App Module内部编写的代码

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

@Module({
  imports: [
    ConfigModule.forRoot({
      envFilePath: ['.env'],
      isGlobal: true,
      cache: true,
    }),
    MongooseModule.forRootAsync({
      useFactory: (configService: ConfigService): any => {
        configService.get('mongoConfig');
      },
      inject: [ConfigService],
    }),
  ],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule {}

这是它抛出的错误：

“无法解构‘mongooseModuleOptions’的属性‘retryAttempts’，因为它是未定义的”

我不明白为什么会抛出这个错误，因为“retryAttempts”是MongooseModuleOptions 接口中的一个可选属性。

MongooseModule接口

export interface MongooseModuleOptions extends ConnectOptions, Record<string, any> {
    uri?: string;
    retryAttempts?: number;
    retryDelay?: number;
    connectionName?: string;
    connectionFactory?: (connection: any, name: string) => any;
}

标签： nestjsnestjs-config

Answer 1

如果您要进行异步 MongoDB 配置，请选择单独的配置类。我将解释如何：

为解决 MongoDB 配置创建一个新服务。

mongodb.config.service.ts

import { Injectable } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import {
  MongooseModuleOptions,
  MongooseOptionsFactory,
} from '@nestjs/mongoose';

@Injectable()
export class MongodbConfigService implements MongooseOptionsFactory {

  constructor(private readonly configService: ConfigService) {}

  //You can retrun promise as well
  public createMongooseOptions(): MongooseModuleOptions {
    return {
      //MONGODB_URL is in .env file
      //MONGO_REPL_SET is in .env file
      //MONGO_AUTH_SOURCE is in .env file
      uri: this.configService.get<string>('MONGODB_URL'),
      useNewUrlParser: true,
      useFindAndModify: false,
      useCreateIndex: true,
      useUnifiedTopology: true,
      replicaSet: this.configService.get<string>('MONGO_REPL_SET'),
      authSource:  this.configService.get<string>('MONGO_AUTH_SOURCE'),
    };
  }
}

猫鼬模块导入：

//...
MongooseModule.forRootAsync({
      imports: [ConfigModule],
      useClass: MongodbConfigService,
    }),
//...

如果要将 MongoDB 配置为配置命名空间：

制作一个文件来保存配置： mongodb.config.ts

import { registerAs } from '@nestjs/config';

// @returns MongooseModuleOptions
export default registerAs('mongo_db', () => ({
      //MONGODB_URL is in .env file
      //MONGO_REPL_SET is in .env file
      //MONGO_AUTH_SOURCE is in .env file
      uri: process.env.MONGODB_URL,
      useNewUrlParser: true,
      useFindAndModify: false,
      useCreateIndex: true,
      useUnifiedTopology: true,
      replicaSet: process.env.MONGO_REPL_SET,
      authSource: process.env.MONGO_AUTH_SOURCE,
}));

现在在配置模块导入中：

import mongoDbConfig from '<path>/mongodb.config';
//...
ConfigModule.forRoot({
      envFilePath: ['.env'],
      isGlobal: true,
      cache: true,
      load:[mongoDbConfig]
    }),
//...

猫鼬模块导入：

//...
MongooseModule.forRootAsync({
    useFactory:(configService:ConfigService)=>{
       return this.configService.get<MongooseModuleOptions>('mongo_db')
       },
    inject: [ConfigService],
    }),
//...

这两种方法都应该有效。

顺便说一句：副本集和身份验证源是从我的配置中复制的。如果您没有副本设置，请忽略它。