ruby-on-rails

<essential_principles>

Vanilla Rails Philosophy

"No one paradigm" - Pragmatism over purity. Rails provides everything needed without complex architectural patterns.

1. Rich Domain Models Over Service Objects

Business logic lives in models. Use nested operation classes for complex workflows:

# Model method delegates to nested class
class Quote < ApplicationRecord
  def create_purchase_order
    PurchaseOrderCreation.new(self).call
  end
end