dynamic_delegation_forwardable

🔗 Dynamic Delegation with Forwardable

The Forwardable module lets you delegate methods to an internal object. Combine it with metaprogramming to create delegators based on configuration.

require 'forwardable'

class Presenter
  extend Forwardable

  def initialize(record)
    @record = record
    define_delegators :@record, *record_class_fields
  end

  def record_class_fields
    @record.class.attribute_names.map(&:to_sym)
  end
end

# Assuming ActiveRecord model User with attributes :name, :email
presenter = Presenter.new(User.new(name: 'Bob', email: 'b@example.com'))
puts presenter.name  # => "Bob"