Rails 7.1: How to properly implement background jobs for file uploads with ActiveStorage and avoid race conditions?
I need help solving I'm currently working on a Rails 7.1 application that uses ActiveStorage to handle file uploads, and I'm trying to implement background jobs for processing these uploads. My question arises when multiple users upload files simultaneously, leading to potential race conditions and inconsistencies in the processing of these uploads. I've tried using `ActiveJob` with Sidekiq to handle the processing asynchronously, but I keep running into issues where the job for one upload interferes with another. Specifically, I see the following behavior in the logs: ``` ActiveRecord::StaleObjectError: Attempted to update a stale object: ActiveStorage::Blob ``` Here's a simplified version of my job class: ```ruby class ProcessUploadJob < ApplicationJob queue_as :default def perform(blob_id) blob = ActiveStorage::Blob.find(blob_id) # Processing logic here # e.g., creating a thumbnail, renaming files, etc. # Simulating some processing time sleep(10) # Save changes to the blob blob.update!(some_attribute: 'new_value') # This raises the behavior end end ``` I enqueue the job like this: ```ruby @user.uploads.each do |upload| ProcessUploadJob.perform_later(upload.blob.id) end ``` I suspect that the `update!` might be failing because the blob is being modified by multiple jobs simultaneously. I tried isolating the processing logic by introducing locks, but I'm unsure how best to handle it with ActiveStorage. What’s the best approach to ensure that each upload is processed independently without causing stale object errors? Any advice or suggested best practices for handling this kind of situation would be greatly appreciated! I'm working on a API that needs to handle this. I'm coming from a different tech stack and learning Ruby.