Creating an In Stock Report

Code Samples

Our store code is coming along! This is the complete version at the end of the video.

module Inventoryable

  def self.included(klass)
    klass.extend(ClassMethods)
    klass.extend(Enumerable)
  end

  module ClassMethods
    def create(attributes)
      object = new(attributes)
      instances.push(object)
      return object
    end

    def instances
      @instances ||= []
    end

    def each(&block)
      instances.each(&block)
    end

    def in_stock_report
      puts "#{self.to_s} In Stock Report"
      reportable = instances.select{ |instance| instance.in_stock? }
      reportable.each do |item|
        line = []
        line.push("Item: #{item.attributes[:name]}")
        line.push("Stock: #{item.stock_count}")
        if item.attributes.include?(:size)
          line.push("Size: #{item.attributes[:size]}")
        end
        puts line.join("\t")
      end
      puts "\n"
    end
  end

  def stock_count
    @stock_count ||= 0
  end

  def stock_count=(number)
    @stock_count = number
  end

  def in_stock?
    stock_count > 0
  end

end

class Shirt
  include Inventoryable
  attr_accessor :attributes

  def initialize(attributes)
    @attributes = attributes
  end
end

class Pant
  include Inventoryable
  attr_accessor :attributes

  def initialize(attributes)
    @attributes = attributes
  end
end

class Accessory
  include Inventoryable
  attr_accessor :attributes

  def initialize(attributes)
    @attributes = attributes
  end
end

shirt = Shirt.create(name: "MTF", size: "L")
shirt.stock_count = 10

shirt = Shirt.create(name: "MTF2", size: "L")

shirt = Shirt.create(name: "MTF", size: "M")
shirt.stock_count = 9

pant = Pant.create(name: "Jeans", size: "M")
pant.stock_count = 2

pant = Pant.create(name: "Jeans", size: "S")
pant.stock_count = 4

accessory = Accessory.create(name: "Belt", size: "M")
accessory.stock_count = 1

accessory = Accessory.create(name: "Belt", size: "L")
accessory.stock_count = 1

accessory = Accessory.create(name: "Necklace")
accessory.stock_count = 1

Shirt.in_stock_report
Pant.in_stock_report
Accessory.in_stock_report