Loopback-next: LoopBack4 Cronjob

Created on 5 Aug 2020 · 5Comments · Source: strongloop/loopback-next

I use cronjob that described in document and i whould use repository in job but below error occured
this is my CronJobComponent:


import {CronJob, cronJob} from '@loopback/cron';
import {repository} from '@loopback/repository';
import moment from 'moment';

import {SettingsRepository, UsersRepository} from '../repositories';

@cronJob()
export class CronJobComponent extends CronJob {
  constructor(
    @repository(UsersRepository) public usersRepository: UsersRepository,
    @repository(SettingsRepository)
    public settingsRepository: SettingsRepository,
  ) {
    super({
      name: 'job-1',
      cronTime: '* */1 * * * *',
      onTick: async () => {
        await this.scheduleNotifyJob();
      },
      start: false,
    });
  }

  async scheduleNotifyJob() {
    const foundUserIds = await this.settingsRepository.find({
      fields: {userId: true},
      where: {
        scheduleNotify: true,
        scheduleTime: moment().startOf('minute').toString(),
      },
    });

    console.log(foundUserIds);
  }
}

This is my Application.ts


import {CronJobComponent} from './components';
import {
  ApplicationConfig,
  BindingKey,
  createBindingFromClass,
} from '@loopback/core';

export class MyApplication extends BootMixin(
  ServiceMixin(RepositoryMixin(RestApplication)),
) {
  hashRound: number;

  constructor(options: ApplicationConfig = {}) {
...
    this.component(CronJobComponent);
    this.add(createBindingFromClass(CronJobComponent));
...
}

Current Behavior

This issue occured:

Cannot start the application. ResolutionError: The key 'repositories.SettingsRepository' is not bound to any value in context MyApplication-4yxpOGOFSwS3Y68UCUEVGA-0 (context: MyApplication-4yxpOGOFSwS3Y68UCUEVGA-0, binding: repositories.SettingsRepository, resolutionPath: components.CronJobComponent --> @CronJobComponent.constructor[0])
    at MyApplication.getValueOrPromise (/home/navid/Projects/dongip_services/node_modules/@loopback/context/src/context.ts:810:13)
    at /home/navid/Projects/dongip_services/node_modules/@loopback/context/src/resolver.ts:159:20
    at /home/navid/Projects/dongip_services/node_modules/@loopback/context/src/resolution-session.ts:157:13
    at tryCatchFinally (/home/navid/Projects/dongip_services/node_modules/@loopback/context/src/value-promise.ts:222:14)
    at Object.tryWithFinally (/home/navid/Projects/dongip_services/node_modules/@loopback/context/src/value-promise.ts:197:10)
    at Function.runWithInjection (/home/navid/Projects/dongip_services/node_modules/@loopback/context/src/resolution-session.ts:156:12)
    at resolve (/home/navid/Projects/dongip_services/node_modules/@loopback/context/src/resolver.ts:143:38)
    at /home/navid/Projects/dongip_services/node_modules/@loopback/context/src/resolver.ts:246:12
    at Object.resolveList (/home/navid/Projects/dongip_services/node_modules/@loopback/context/src/value-promise.ts:169:28)
    at resolveInjectedArguments (/home/navid/Projects/dongip_services/node_modules/@loopback/context/src/resolver.ts:224:10)
    at Object.instantiateClass (/home/navid/Projects/dongip_services/node_modules/@loopback/context/src/resolver.ts:62:25)
    at /home/navid/Projects/dongip_services/node_modules/@loopback/context/src/binding.ts:747:29
    at Binding._getValue (/home/navid/Projects/dongip_services/node_modules/@loopback/context/src/binding.ts:603:14)
    at /home/navid/Projects/dongip_services/node_modules/@loopback/context/src/binding.ts:478:23
    at /home/navid/Projects/dongip_services/node_modules/@loopback/context/src/resolution-session.ts:122:13
    at tryCatchFinally (/home/navid/Projects/dongip_services/node_modules/@loopback/context/src/value-promise.ts:222:14) {
  resolutionCtx: {
    context: MyApplication {
      _events: [Object: null prototype],
      _eventsCount: 2,
      _maxListeners: Infinity,
      registry: [Map],
      _parent: undefined,
      name: 'MyApplication-4yxpOGOFSwS3Y68UCUEVGA-0',
      tagIndexer: [ContextTagIndexer],
      subscriptionManager: [ContextSubscriptionManager],
      _debug: [Function],
      _isShuttingDown: false,
      _state: 'created',
      options: [Object],
      _shutdownOptions: [Object],
      hashRound: 10,
      configResolver: [DefaultConfigurationResolver],
      [Symbol(kCapture)]: false
    },
    binding: Binding {
      _events: [Object: null prototype] {},
      _eventsCount: 0,
      _maxListeners: undefined,
      isLocked: false,
      tagMap: {},
      key: 'repositories.SettingsRepository',
      [Symbol(kCapture)]: false
    },
    options: {
      session: [ResolutionSession],
      decorator: '@inject',
      name: 'SettingsRepository',
      modelName: undefined,
      modelClass: undefined,
      dataSourceName: undefined,
      dataSource: undefined
    }
  },
  name: 'ResolutionError'
}

Additional information

  node -e 'console.log(process.platform, process.arch, process.versions.node)'
         linux x64 12.16.2

```
npm ls --prod --depth 0 | grep loopback
├── @loopback/[email protected]
├── @loopback/[email protected]
├── @loopback/[email protected]
├── @loopback/[email protected]
├── @loopback/[email protected]
├── @loopback/[email protected]
├── @loopback/[email protected]
├── @loopback/[email protected]
├── @loopback/[email protected]
├── @loopback/[email protected]
├── @loopback/[email protected]
├── @loopback/[email protected]
├── @loopback/[email protected]
├── @loopback/[email protected]
├── @loopback/[email protected]
├── [email protected]

```

question

Source

navidarry

All 5 comments

Sorry for reporting in bug. now i noticed and cannot move to questions

navidarry on 5 Aug 2020

@navidarry, i just created an app with CronJob, which is similar to yours. I think in application.ts, it should be:

import {CronComponent} from '@loopback/cron';

and in the constructor:

    this.component(CronComponent); //CronComponent from the cron package
    this.add(createBindingFromClass(MyCronJob)); //MyCronJob is the component extends CronJob

Not sure if that's the cause of the problem. Could you please give it a try?