item.rb

require 'date'

class Item
  attr_accessor :id
  attr_reader :archived, :genre, :label, :author

  def initialize(publish_date)
    @id = Random.rand(0..10_000)
    @publish_date = publish_date
    @archived = false
  end

  def genre=(genre)
    @genre = genre
    genre.items.push(self) unless genre.items.include?(self)
  end

  def author=(author)
    @author = author
    author.items.push(self) unless author.items.include?(self)
  end

  def label=(label)
    @label = label
    label.items.push(self) unless label.items.include?(self)
  end

  def move_to_archive
    @archived = can_be_archived?
  end

  def to_s
    "Publish date: #{@publish_date}, Archived: #{@archived}\n#{@genre}\n#{@author}\n#{@label}"
  end

  def to_json(_args)
    {
      'id' => @id,
      'publish_date' => @publish_date,
      'archived' => @archived,
      'genre_id' => @genre.id,
      'author_id' => @author.id,
      'label_id' => @label.id
    }
  end

  private

  def can_be_archived?
    Date.today.year - Date.parse(@publish_date).year > 10
  end
end