Execute puma workers only in prod but not in dev environment

Question

I'm executing the following puma configuration

threads_count = Integer(ENV["DB_POOL"] || ENV["MAX_THREADS"] || 15)
threads threads_count, threads_count
workers 3
preload_app!

rackup      DefaultRackup
port        ENV["PORT"]     || 3000
environment ENV["RACK_ENV"] || "development"

on_worker_boot do
  ActiveSupport.on_load(:active_record) do
    ActiveRecord::Base.establish_connection
  end
end

before_fork do
  ActiveRecord::Base.connection_pool.disconnect!
end

It works fine for production but I do not want to create 3 workers or use webrick in dev environment. If I try and wrap the worker specific code in env check, it breaks the puma DSL. Any other way I could run puma in non clustered mode in dev.

Answer 1

You can us RACK_ENV here instead of Rails as Rails is not defined for puma config.

workers(ENV["RACK_ENV"] == "production" ? 3 : 0)