robot.rb

class Robot < ApplicationRecord
  validates :name,  presence: true
  validates :color, presence: true

  belongs_to :color
  belongs_to :shipment, optional: true

  has_and_belongs_to_many :statuses

  def should_be_recycled?
    rusty? || loose_screews?
  end

  def rusty?
    statuses.rusty.present?
  end

  def loose_screws?
    statuses.loose_screws.present?
  end
end