依赖性注入-INestApplication上的app.get(UploadService)无法解决其依赖性

时间:2019-07-17 07:47:29

标签: node.js dependency-injection nestjs

我正在尝试创建使用我的Nest上下文的外部CLI。我已经建立了入口点,该入口点使用NestFactory.create创建应用程序。使用app.get访问服务后,该服务存在并可以正常工作。问题是,它不能解决任何依赖关系。文档上没有示例,我也没有在Internet上找到与此问题相关的任何信息。

我正在2019年7月17日在Node 10上使用Nest.js的最新版本。

main.ts

import { NestFactory } from '@nestjs/core';

import { AppModule } from '../app.module';
import { UploadService } from 'src/api/upload/upload.service';
import { UploadModule } from 'src/api/upload/upload.module';

async function bootstrap(): Promise<void> {
  const app = await NestFactory.create(AppModule);
  await app.init();

  const service: UploadService = app.select(UploadModule).get(UploadService);

  console.log(service); // OK - returns UploadService instance
  console.log(service.uploadModel); // X - returns `undefined`
  console.log(service.configService); // X - returns `undefined`
}

bootstrap();

app.module.ts

import { Module } from '@nestjs/common';
import { MongooseModule } from '@nestjs/mongoose';
import { ConfigModule } from './config/config.module';
import { ConfigService } from './config/config.service';
import { AwsModule } from './services/aws/aws.module';
import { UploadModule } from './api/upload/upload.module';

@Module({
  imports: [
    ConfigModule,
    MongooseModule.forRootAsync({
      useFactory: async (configService: ConfigService): Promise<object> => ({
        uri: configService.data.database.mongo.uri,
        useCreateIndex: true,
        useNewUrlParser: true,
      }),
      inject: [ConfigService],
    }),
    AwsModule,
    UploadModule,
  ],
})
export class AppModule {}

upload.module.ts

import { Module } from '@nestjs/common';
import { MongooseModule } from '@nestjs/mongoose';
import { AwsModule } from '../../services/aws/aws.module';
import { UploadService } from './upload.service';
import { UploadSchema } from './upload.schema';

@Module({
  imports: [MongooseModule.forFeature([{ name: 'Upload', schema: UploadSchema }]), AwsModule],
  providers: [UploadService],
  exports: [UploadService],
})
export class UploadModule {}

upload.service.ts

import { Injectable } from '@nestjs/common';
import { AwsService } from '../../services/aws/aws.service';

import { Upload } from './upload.schema';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';

@Injectable()
export class UploadService {
  constructor(
    @InjectModel('Upload')
    readonly uploadModel: Model<Upload>,
    readonly awsService: AwsService,
  ) {}
}

预期的输出

console.log(service.uploadModel); // X - returns `undefined`
console.log(service.configService); // X - returns `undefined`

是模型/服务实例。不幸的是,由于依赖项注入没有发生,它们都返回了undefined

1 个答案:

答案 0 :(得分:0)

我尝试了你所做的,在 nestjs 版本:7.6 中它按预期工作。

所以我的假设是他们同时修复了它。