Handling Thread Safety implementing Concurrent Ruby in a Rails Application
I'm sure I'm missing something obvious here, but Quick question that's been bugging me - I'm a bit lost with Quick question that's been bugging me - I’m working with thread safety issues in my Rails 7 application that uses Concurrent Ruby (version 1.1.9)... I have a background job that processes records in a loop using `Concurrent::Future`, but I'm getting intermittent `ActiveRecord::ConnectionNotEstablished` errors. Here's a simplified version of my job: ```ruby class MyJob < ApplicationJob queue_as :default def perform records = MyModel.where(processed: false) futures = records.map do |record| Concurrent::Future.execute do # Simulate some processing record.update!(processed: true) end end futures.each(&:wait!) # Wait for all futures to complete end end ``` The job is running fine on a small dataset, but when I scale up to thousands of records, I start hitting the connection scenario. I’ve tried ensuring that I’m using `ActiveRecord::Base.connection_pool.with_connection` inside the `Future`, but it doesn't seem to help. Here’s a snippet of what I attempted: ```ruby Concurrent::Future.execute do ActiveRecord::Base.connection_pool.with_connection do record.update!(processed: true) end end ``` I also added connection pooling settings in my `database.yml`, setting `pool: 5`, but the scenario continues. Any suggestions on how to make this job thread-safe and avoid these connection errors? Is there a recommended pattern for using concurrency with ActiveRecord in Rails? I’m particularly interested in best practices for managing database connections in this context. I'm coming from a different tech stack and learning Ruby. Any suggestions would be helpful. This is for a application running on Windows 11. Am I missing something obvious? Any examples would be super helpful.