Resque问题：在Job内部调用#perform_later无法触发子Job执行

Hey there, let's break down why your child jobs aren't running. Looking at the code snippet you shared, the first thing that stands out is that your start_events method is iterating over events and their connectors—but there’s no actual code triggering a child job in that loop. That’s probably the biggest missing piece right now.

Let’s walk through the most likely fixes and checks step by step:

• Add code to enqueue your child jobs
  Right now, you’re looping through connectors but not telling Rails to run a job for each one. You need to explicitly call your child job’s perform_later (for async execution) or perform_now (for synchronous execution) method inside the loop. For example:

  private
  def start_events
    events = Events.all
    events.each do |event|
      event.connectors.each do |con|
        # Replace with your actual child job class name
        ChildConnectorJob.perform_later(con.id)
      end
    end
  end
  

  Without this line, your parent job just loops through records and does nothing to trigger the work you want.

• Verify your child job is properly defined
  Make sure your child job follows the Active Job structure:

  class ChildConnectorJob < ApplicationJob
    queue_as :default # Or a specific queue name
  
    def perform(connector_id)
      connector = Connector.find(connector_id)
      # Add your actual processing logic here
    end
  end
  

  If the child job doesn’t inherit from ApplicationJob, lacks a perform method, or has syntax errors, it won’t execute even if enqueued.

• Check your queue processor and configuration

  • If you’re using a tool like Sidekiq or Delayed Job, ensure the processor is running (e.g., bundle exec sidekiq for Sidekiq). If it’s stopped, jobs will sit in the queue indefinitely.
  • If your child job uses a custom queue (via queue_as :custom_queue), make sure your processor is listening to that queue. For Sidekiq, that means starting it with bundle exec sidekiq -q default -q custom_queue.
  • In development, if you’re using the default async adapter, note that it runs jobs in the same process as your server—restarting the server will clear pending jobs, and long-running parent jobs might block child job execution. Switching to a dedicated processor like Sidekiq for testing is better.

• Catch silent failures in the parent job
  If an exception occurs while iterating (e.g., a missing event/connector, database error), the parent job might stop early without triggering all child jobs. Add logging and error handling to debug this:

  private
  def start_events
    events = Events.all
    events.each do |event|
      event.connectors.each do |con|
        begin
          ChildConnectorJob.perform_later(con.id)
          Rails.logger.info "Enqueued child job for connector #{con.id}"
        rescue => e
          Rails.logger.error "Failed to enqueue job for connector #{con.id}: #{e.message}"
        end
      end
    end
  end
  

  Also, check your logs to confirm the parent job is running fully—you should see both TriggerJob before_perform and TriggerJob after_perform printed.

• Rule out hook interference
  Your around_perform block looks correct, but double-check if there are global job hooks (e.g., in ApplicationJob) or callbacks that might be blocking child job enqueuing or execution.

Start with the first check—adding the child job enqueue line is almost certainly the fix you need right now. If that’s already in place, work through the other steps while checking logs to narrow down where things are getting stuck.

内容的提问来源于stack exchange，提问作者Peter Evjan