solid-queue-setup

name	solid-queue-setup
description	Configures Solid Queue for background jobs in Rails 8. Use when setting up background processing, creating background jobs, configuring job queues, or migrating from Sidekiq to Solid Queue. WHEN NOT: Synchronous in-request processing, real-time WebSocket features (use Action Cable), or simple operations that don't need background execution.
paths	app/jobs/**/*.rb, config/queue.yml, spec/jobs/**/*.rb

Solid Queue Setup for Rails 8

Overview

Solid Queue is Rails 8's default Active Job backend:

• Database-backed (no Redis required)
• Built-in concurrency controls
• Supports priorities and multiple queues
• Mission-critical job processing
• Web UI available via Mission Control

Quick Start

Installation

# Add to Gemfile (included in Rails 8 by default)
bundle add solid_queue

# Install Solid Queue
bin/rails solid_queue:install

# Run migrations
bin/rails db:migrate

Configuration

# config/solid_queue.yml
default: &default
  dispatchers:
    - polling_interval: 1
      batch_size: 500
  workers:
    - queues: "*"
      threads: 3
      processes: 1
      polling_interval: 0.1

development:
  <<: *default

production:
  <<: *default
  workers:
    - queues: [critical, default]
      threads: 5
      processes: 2
    - queues: [low]
      threads: 2
      processes: 1

Set as Active Job Adapter

# config/application.rb
config.active_job.queue_adapter = :solid_queue

# Or per environment
# config/environments/production.rb
config.active_job.queue_adapter = :solid_queue

Workflow Checklist

Solid Queue Setup:
- [ ] Add solid_queue gem
- [ ] Run solid_queue:install
- [ ] Run migrations
- [ ] Configure queues in solid_queue.yml
- [ ] Set queue adapter in config
- [ ] Create first job with spec
- [ ] Test job execution
- [ ] Configure recurring jobs (if needed)

Creating Jobs

Basic Job

# app/jobs/send_welcome_email_job.rb
class SendWelcomeEmailJob < ApplicationJob
  queue_as :default

  def perform(user_id)
    user = User.find(user_id)
    UserMailer.welcome(user).deliver_now
  end
end

Job with Retries

# app/jobs/process_payment_job.rb
class ProcessPaymentJob < ApplicationJob
  queue_as :critical

  # Retry on specific errors
  retry_on PaymentGatewayError, wait: :polynomially_longer, attempts: 5

  # Don't retry on these
  discard_on ActiveRecord::RecordNotFound

  # Custom error handling
  rescue_from(StandardError) do |exception|
    ErrorNotifier.notify(exception)
    raise # Re-raise to trigger retry
  end

  def perform(order_id)
    order = Order.find(order_id)
    PaymentService.new.charge(order)
  end
end

Job with Priority

class UrgentNotificationJob < ApplicationJob
  queue_as :critical

  # Lower number = higher priority
  # Default is 0
  def priority
    -10
  end

  def perform(notification_id)
    # Process urgent notification
  end
end

Enqueueing Jobs

# Enqueue immediately
SendWelcomeEmailJob.perform_later(user.id)

# Enqueue with delay
SendReminderJob.set(wait: 1.hour).perform_later(user.id)

# Enqueue at specific time
SendReportJob.set(wait_until: Date.tomorrow.noon).perform_later

# Enqueue on specific queue
ProcessJob.set(queue: :low).perform_later(data)

# Perform immediately (skips queue - use sparingly)
SendWelcomeEmailJob.perform_now(user.id)

Recurring Jobs

# config/recurring.yml
production:
  daily_report:
    class: GenerateDailyReportJob
    schedule: every day at 6am
    queue: low

  cleanup:
    class: CleanupOldRecordsJob
    schedule: every sunday at 2am

  sync:
    class: SyncExternalDataJob
    schedule: every 15 minutes

Testing Jobs

Job Spec Template

# spec/jobs/send_welcome_email_job_spec.rb
require 'rails_helper'

RSpec.describe SendWelcomeEmailJob, type: :job do
  let(:user) { create(:user) }

  describe '#perform' do
    it 'sends welcome email' do
      expect {
        described_class.perform_now(user.id)
      }.to have_enqueued_mail(UserMailer, :welcome)
    end
  end

  describe 'enqueueing' do
    it 'enqueues the job' do
      expect {
        described_class.perform_later(user.id)
      }.to have_enqueued_job(described_class)
        .with(user.id)
        .on_queue('default')
    end
  end

  describe 'retry behavior' do
    it 'retries on PaymentGatewayError' do
      expect(described_class).to have_retry_on(PaymentGatewayError)
    end
  end
end

Test Helpers

# spec/rails_helper.rb
RSpec.configure do |config|
  config.include ActiveJob::TestHelper
end

# In specs
it 'processes all jobs' do
  perform_enqueued_jobs do
    UserSignupService.call(user_params)
  end
  expect(user.reload.welcome_email_sent?).to be true
end

it 'enqueues multiple jobs' do
  expect {
    BatchProcessor.process(items)
  }.to have_enqueued_job(ProcessItemJob).exactly(items.count).times
end

Running Solid Queue

# Development (runs in separate terminal)
bin/rails solid_queue:start

# Production (via Procfile)
# Procfile
web: bin/rails server
worker: bin/rails solid_queue:start

Monitoring

Mission Control (Web UI)

# Gemfile
gem "mission_control-jobs"

# config/routes.rb
mount MissionControl::Jobs::Engine, at: "/jobs"

Console Queries

# Check pending jobs
SolidQueue::Job.where(finished_at: nil).count

# Check failed jobs
SolidQueue::FailedExecution.count

# Retry failed job
SolidQueue::FailedExecution.last.retry

# Clear old completed jobs
SolidQueue::Job.where('finished_at < ?', 1.week.ago).delete_all

Migration from Sidekiq

Sidekiq	Solid Queue
perform_async(args)	perform_later(args)
perform_in(5.minutes, args)	set(wait: 5.minutes).perform_later(args)
sidekiq_options queue: 'critical'	queue_as :critical
sidekiq_retry_in	retry_on with wait: