Tsed: Dependency injection failing on standalone service

[johncalvinroberts]

Description

I've wrote a few services to function as standalone services, i.e. doing some fetching and scraping, then calling some other repository services to save to DB. Point being: the service is not instantiated by a controller, just trying to instantiate in Server.ts.

The Problem

Cannot inject service into Server.ts. Can compile without error, but the instance of the service class comes back as undefined.

Steps to reproduce

1. Create a standalone service object class in Services directory

// ShopifyScraperService.ts
import { Service } from '@tsed/common'
import { AbstractScraperService } from './AbstractScraperService'

@Service()
export class ShopifyScraperService extends AbstractScraperService {

    public startScraping = (url: string) => {
        console.log('hey, welcome to scraper service')
    }
}

1. Inject in Server.ts and try to call class method

// Server.ts
import { GlobalAcceptMimesMiddleware, InjectorService, ServerLoader, ServerSettings } from '@tsed/common'
import '@tsed/mongoose'
import '@tsed/multipartfiles'
import { ShopifyScraperService } from './services/scraping/ShopifyScraperService'

// config @serversettings here
export class Server extends ServerLoader {
    public $onReady() {
       const shopifyScraperService: ShopifyScraperService = InjectorService.get(ShopifyScraperService)
        console.log(shopifyScraperService) // <--- WILL PRINT UNDEFINED
       shopifyScraperService.startScraping('https://scrapme.com/stuff') // <-- WILL THROW ERROR
  }
}

What I tried

• Tried @Inject decorator above $onReady hook. Like:

    @Inject()
    $onReady(service: Service) {
          // service.doSomething()
    }

• Tried injecting in class constructor of Server class, like:

export class Server extends ServerLoader {
 constructor(public shopifyScraperService: ShopifyScraperService){}

• Tried injecting withInjectorService. See code sample from steps to reproduce
• also tried this method invoked inside of a setTimeout

Thanks in advance!

[milewski]

you can grab the instance of your service like this:

export class Server extends ServerLoader {
    public $onReady() {
        const shopifyScraperService: ShopifyScraperService = this.injector.get(ShopifyScraperService)
        shopifyScraperService.startScraping('https://scrapme.com/stuff')
    }
}

[johncalvinroberts]

Solution from @milewski worked completely

Thanks!