Queue producers in NestJS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to inject the queue producer in the constructor.

NestJS

constructor(private readonly [1]: Queue) {}

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AqueueService

BproducerQueue

CqueueProducer

Dqueue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that does not match the injected type.

Forgetting to mark the constructor parameter as private readonly.

In NestJS, the queue producer is typically injected by its token or class name. Here, Queue is the injected type, so the variable name queue is the correct choice.

2fill in blank

medium

Complete the code to send a message to the queue.

NestJS

await this.queue.[1]({ text: 'Hello' });

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Apublish

Badd

Csend

Demit

Attempts:

3 left

💡 Hint

Common Mistakes

Using send which is not a method on the queue producer.

Using publish which is for event emitters.

The add method is used in NestJS queue producers to add a job or message to the queue.

3fill in blank

hard

Fix the error in the queue producer decorator.

NestJS

@[1]('email')
export class EmailProducer {}

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AQueueProducer

BProducerQueue

CInjectQueue

DInjectQueueProducer

Attempts:

3 left

💡 Hint

Common Mistakes

Using @InjectQueue instead of @QueueProducer.

Using incorrect decorator names that do not exist.

The correct decorator to define a queue producer in NestJS is @QueueProducer('queueName').

4fill in blank

hard

Fill both blanks to correctly import and inject the queue.

NestJS

import { [1] } from '@nestjs/bull';

constructor(@[2]('notifications') private queue: Queue) {}

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AInjectQueue

BQueueProducer

CInject

DBullModule

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing InjectQueue with QueueProducer.

Using Inject without specifying the queue name.

You import InjectQueue from @nestjs/bull and use it as a parameter decorator to inject a named queue.

5fill in blank

hard

Fill all three blanks to create a job with a delay and priority.

NestJS

await this.queue.add('sendEmail', { to: '[e-mail]' }, { [1]: 5000, [2]: [3] });

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Adelay

Bpriority

Chigh

Dtimeout

Attempts:

3 left

💡 Hint

Common Mistakes

Using timeout instead of delay.

Setting priority to a number instead of a string like 'high'.

The options object for adding a job can include delay in milliseconds and priority with values like high.