maybe.rb

class Maybe < BasicObject
  UNPROXIED_METHODS = %i(__send__ __id__ send object_id extend instance_eval initialize block_given? raise caller method)

  delegate *(::NilClass.instance_methods - UNPROXIED_METHODS), to: :@just

  def initialize(obj)
    @just = obj
  end

  # for debug
  def inspect
    "#<Maybe: just(#{@just.inspect})>"
  end

  def just!
    @just
  end

  def method_missing(method, *args, &block)
    if @just.respond_to?(method)
      val = @just.__send__(method, *args, &block)
    else
      val = nil
    end

    ::Maybe.new(val)
  end
end

=begin
How To Use

before:
  <%= @user.try(:section).try(:company).try(:name) %>

after:
  <%= maybe(@user).section.company.name %>

where:
  ApplicationHelper
    def maybe(obj)
      Maybe.new(obj)
    end
  end

=end