2.2 懒加载

一、注入形式

1. lazy.module.ts

import { Module } from '@nestjs/common';
import { LazyService } from './lazy.service';
import { LazyController } from './lazy.controller';

@Module({
  controllers: [LazyController],
  providers: [LazyService],
  exports: [LazyService],
})
export class LazyModule {}

2. lazy.service.ts

import { Injectable } from '@nestjs/common';

@Injectable()
export class LazyService {
  findAll() {
    return `This action returns all lazy`;
  }
}

3. keyword.controller.ts

import {
  Controller,
  Get,
  Inject,
} from '@nestjs/common';
import { LazyModuleLoader } from '@nestjs/core';
import { LazyService } from '../lazy/lazy.service';
 @Controller('keyword')
export class KeywordController {
 @Inject()
 private lazyModuleLoader: LazyModuleLoader;
 @Get()
  async findOne() {
    const { LazyModule } = await import('../lazy/lazy.module');
    const moduleRef = await this.lazyModuleLoader.load(() => LazyModule);
    const lazyService = moduleRef.get(LazyService);
    return lazyService.findAll();
  }
}

二、app实例获取

  const lazyModuleLoader = app.get(LazyModuleLoader);