object

task.rb

class Task
  def due_date
    @due_date = DueDate.new(self)
  end
end

class DueDate
  def initialize(task)
    @task = task
  end
  
  def overdue?
    return false unless task.due_date.present?

    task.due_date.before?(Date.current)
  end
end

Task.new.due_date.overdue?