Nestjs:无法异步连接mongo [英] Nestjs: Unable to connect mongo asynchronously
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问题描述
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,
},
});
以下是应用程序模块内部编写的代码
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 {}
这是它引发的错误:
无法分解"mongooseModuleOptions"的属性"retryAttempts",因为该属性未定义&qot;
我不明白它为什么引发此错误,因为"retryAttempts"是MongooseModuleOptions接口中的可选属性。
MongooseModuleInterface
export interface MongooseModuleOptions extends ConnectOptions, Record<string, any> {
uri?: string;
retryAttempts?: number;
retryDelay?: number;
connectionName?: string;
connectionFactory?: (connection: any, name: string) => any;
}
推荐答案
如果您要使用async MongoDB configuration,请使用单独的配置类。我将解释如何:
创建用于解析MongoDB配置的新服务。
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'),
};
}
}
Mongoose模块导入:
//...
MongooseModule.forRootAsync({
imports: [ConfigModule],
useClass: MongodbConfigService,
}),
//...
如果要将MongoDB配置为config namespace:
创建用于保存配置的文件: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]
}),
//...
Mongoose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:副本集和授权源是从我的配置中复制的。如果您没有安装副本,请忽略它。这篇关于Nestjs:无法异步连接mongo的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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