Cop idea: Do not use threads in your jobs

[ydakuka]

Reference: https://github.com/toptal/active-job-style-guide#threads

# bad - consumes all available connections
class SomeJob < ApplicationJob
  def perform
    User.find_each |user|
      Thread.new do
        ExternalService.update(user)
      end
    end
  end
end

# good
class SomeJob < ApplicationJob
  def perform(user)
    ExternalService.update(user)
  end
end

User.find_each |user|
  SomeJob.perform_later(user)
end