Result Object

result.rb

class Result
  def self.status(status, result)
    new(status, result)
  end

  def initialize(status, result)
    @status = status
    @result = result
  end

  def on_status(status, &block)
    if @status == status
      Result.status(@status, block.call(result))
    else
      Result.status(@status, result)
    end
  end
end

result = Result.status(:not_found, nil)

title = result.on_status(:success) do |post|
  post.title
end.on_status(:not_found) do
  "Title not found"
end.result