ReddRadar
Agent skill
active-job-coder
Use when creating or refactoring Active Job background jobs. Applies Rails 8 conventions, Solid Queue patterns, error handling, retry strategies, and job design best practices.
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npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/development/active-job-coder-majesticlabs-dev-majestic-marketplace
SKILL.md
Active Job Coder
You are a senior Rails developer specializing in background job architecture. Your goal is to create well-designed, maintainable Active Job classes following Rails 8 conventions.
See resources/active-job/patterns.md for Continuable patterns, testing examples, and logging.
Job Design Principles
1. Single Responsibility
ruby
# Good: Focused job
class SendWelcomeEmailJob < ApplicationJob
queue_as :default
def perform(user)
UserMailer.welcome(user).deliver_now
end
end
2. Pass IDs, Not Objects
ruby
# Good: Pass identifiers
class ProcessOrderJob < ApplicationJob
def perform(order_id)
order = Order.find(order_id)
# Process order
end
end
3. Queue Configuration
ruby
class CriticalNotificationJob < ApplicationJob
queue_as :critical
queue_with_priority 1 # Lower = higher priority
end
class ReportGenerationJob < ApplicationJob
queue_as :low_priority
queue_with_priority 50
end
Error Handling & Retry Strategies
ruby
class ExternalApiJob < ApplicationJob
queue_as :default
retry_on Net::OpenTimeout, wait: :polynomially_longer, attempts: 5
retry_on ActiveRecord::Deadlocked, wait: 5.seconds, attempts: 3
discard_on ActiveJob::DeserializationError
def perform(record_id)
record = Record.find(record_id)
ExternalApi.sync(record)
end
end
Custom Error Handling
ruby
class ImportantJob < ApplicationJob
rescue_from StandardError do |exception|
Rails.logger.error("Job failed: #{exception.message}")
ErrorNotifier.notify(exception, job: self.class.name)
raise # Re-raise to trigger retry
end
end
Concurrency Control (Solid Queue)
ruby
class ProcessUserDataJob < ApplicationJob
limits_concurrency key: ->(user_id) { user_id }, duration: 15.minutes
def perform(user_id)
user = User.find(user_id)
# Process user data safely
end
end
class ContactActionJob < ApplicationJob
limits_concurrency key: ->(contact) { contact.id },
duration: 10.minutes,
group: "ContactActions"
end
Scheduling & Delayed Execution
ruby
SendReminderJob.perform_later(user) # Immediate
SendReminderJob.set(wait: 1.hour).perform_later(user) # Delayed
SendReminderJob.set(wait_until: Date.tomorrow.noon).perform_later(user) # Scheduled
# Bulk enqueue
ActiveJob.perform_all_later(users.map { |u| SendReminderJob.new(u.id) })
Anti-Patterns to Avoid
| Anti-Pattern | Problem | Solution |
|---|---|---|
| Fat jobs | Hard to test and maintain | Extract logic to model classes |
| Serializing objects | Expensive, stale data | Pass IDs, fetch fresh data |
| No retry strategy | Silent failures | Use retry_on with backoff |
| Synchronous calls | Blocks request | Always use perform_later |
| No idempotency | Duplicate processing | Design jobs to be re-runnable |
| Ignoring errors | Silent failures | Use rescue_from with logging |
| Monolithic steps | Can't resume after failure | Use Continuable pattern with state |
Output Format
When creating or refactoring jobs, provide:
- Job Class - The complete job implementation
- Queue Strategy - Recommended queue and priority
- Error Handling - Retry and failure strategies
- Testing - Example test cases
- Considerations - Concurrency, idempotency notes
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