delegation_with_forwardable

🛠️ Dynamic Delegation via Forwardable

Use the Forwardable module to route method calls to encapsulated objects, while retaining the ability to override individual delegations. This pattern streamlines API design and separation of concerns.

require 'forwardable'

class Decorator
  extend Forwardable
  def_delegators :@obj, :name, :value

  def initialize(obj)
    @obj = obj
  end

  # Override one delegation for custom behavior
  def value
    "Decorated #{ @obj.value }"
  end
end

class Data; attr_reader :name, :value; end

data = Data.new
decorator = Decorator.new(data)
puts decorator.name   # => nil (Data#name)
puts decorator.value  # => "Decorated "

# Fallback dynamic delegation via method_missing
class SmartDelegator
  def initialize(obj)
    @obj = obj
  end

  def method_missing(m, *args, &blk)
    return @obj.public_send(m, *args, &blk) if @obj.respond_to?(m)
    super
  end
end