const_missing_dynamic_resolution

🔍 Dynamic Constant Resolution with const_missing

Override const_missing to handle missing constants at runtime—ideal for on-the-fly proxy classes or multi-tenant namespaces. Be cautious: always call super for truly missing constants to preserve expected NameError behavior.

module ServiceFactory
  def self.const_missing(name)
    klass = Class.new do
      define_method(:call) { |*args| puts "Calling #{name} with \\u{2026}" }
    end
    const_set(name, klass)
  end
end

ServiceFactory::EmailService.new.call('hi')

This pattern auto-defines service objects under a common module.