Market

Instructions

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Iteration 1 - Items & Vendors

The Market will need to keep track of its Vendors and their Items. Each Vendor will be able to report its total inventory, stock items, and return the quantity of items. Any item not in stock should return 0 by default.

Use TDD to create a Vendor class that responds to the following interaction pattern:

pry(main)> require './lib/item'
#=> true

pry(main)> require './lib/vendor'
#=> true

pry(main)> item1 = Item.new({name: 'Peach', price: "$0.75"})
#=> #<Item:0x007f9c56740d48...>

pry(main)> item2 = Item.new({name: 'Tomato', price: '$0.50'})
#=> #<Item:0x007f9c565c0ce8...>

pry(main)> item2.name
#=> "Tomato"

pry(main)> item2.price
#=> 0.50

pry(main)> vendor = Vendor.new("Rocky Mountain Fresh")
#=> #<Vendor:0x00007f85683152f0...>

pry(main)> vendor.name
#=> "Rocky Mountain Fresh"

pry(main)> vendor.inventory
#=> {}

pry(main)> vendor.check_stock(item1)
#=> 0

pry(main)> vendor.stock(item1, 30)

pry(main)> vendor.inventory
#=> {#<Item:0x007f9c56740d48...> => 30}

pry(main)> vendor.check_stock(item1)
#=> 30

pry(main)> vendor.stock(item1, 25)

pry(main)> vendor.check_stock(item1)
#=> 55

pry(main)> vendor.stock(item2, 12)

pry(main)> vendor.inventory
#=> {#<Item:0x007f9c56740d48...> => 55, #<Item:0x007f9c565c0ce8...> => 12}

Iteration 2 - Market and Vendors

A Vendor will be able to calculate their potential_revenue - the sum of all their items' price * quantity.

A Market is responsible for keeping track of Vendors. It should have a method called vendor_names that returns an array of all the Vendor's names.

Additionally, the Market should have a method called vendors_that_sell that takes an argument of an item represented as a String. It will return a list of Vendors that have that item in stock.

Use TDD to create a Market class that responds to the following interaction pattern:

pry(main)> require './lib/item'
#=> true

pry(main)> require './lib/vendor'
#=> true

pry(main)> require './lib/market'
#=> true

pry(main)> market = Market.new("South Pearl Street Farmers Market")    
#=> #<Market:0x00007fe134933e20...>

pry(main)> market.name
#=> "South Pearl Street Farmers Market"

pry(main)> market.vendors
#=> []

pry(main)> vendor1 = Vendor.new("Rocky Mountain Fresh")
#=> #<Vendor:0x00007fe1348a1160...>

pry(main)> item1 = Item.new({name: 'Peach', price: "$0.75"})
#=> #<Item:0x007f9c56740d48...>

pry(main)> item2 = Item.new({name: 'Tomato', price: '$0.50'})
#=> #<Item:0x007f9c565c0ce8...>

pry(main)> item3 = Item.new({name: "Peach-Raspberry Nice Cream", price: "$5.30"})
#=> #<Item:0x007f9c562a5f18...>

pry(main)> item4 = Item.new({name: "Banana Nice Cream", price: "$4.25"})
#=> #<Item:0x007f9c56343038...>

pry(main)> vendor1.stock(item1, 35)    

pry(main)> vendor1.stock(item2, 7)    

pry(main)> vendor2 = Vendor.new("Ba-Nom-a-Nom")    
#=> #<Vendor:0x00007fe1349bed40...>

pry(main)> vendor2.stock(item4, 50)    

pry(main)> vendor2.stock(item3, 25)

pry(main)> vendor3 = Vendor.new("Palisade Peach Shack")    
#=> #<Vendor:0x00007fe134910650...>

pry(main)> vendor3.stock(item1, 65)  

pry(main)> market.add_vendor(vendor1)    

pry(main)> market.add_vendor(vendor2)    

pry(main)> market.add_vendor(vendor3)

pry(main)> market.vendors
#=> [#<Vendor:0x00007fe1348a1160...>, #<Vendor:0x00007fe1349bed40...>, #<Vendor:0x00007fe134910650...>]

pry(main)> market.vendor_names
#=> ["Rocky Mountain Fresh", "Ba-Nom-a-Nom", "Palisade Peach Shack"]

pry(main)> market.vendors_that_sell(item1)
#=> [#<Vendor:0x00007fe1348a1160...>, #<Vendor:0x00007fe134910650...>]

pry(main)> market.vendors_that_sell(item4)
#=> [#<Vendor:0x00007fe1349bed40...>]

pry(main)> vendor1.potential_revenue
#=> 29.75

pry(main)> vendor2.potential_revenue
#=> 345.00

pry(main)> vendor3.potential_revenue
#=> 48.75

Iteration 3 - Items sold at the Market

Add a method to your Market class called sorted_item_list that returns a list of names of all items the Vendors have in stock, sorted alphabetically. This list should not include any duplicate items.

Additionally, your Market class should have a method called total_inventory that reports the quantities of all items sold at the market. Specifically, it should return a hash with items as keys and hash as values - this sub-hash should have two key/value pairs: quantity pointing to total inventory for that item and vendors pointing to an array of the vendors that sell that item.

You Market will also be able to identify overstocked_items. An item is overstocked if it is sold by more than 1 vendor AND the total quantity is greater than 50.

Use TDD to update your Market class so that it responds to the following interaction pattern:

pry(main)> require './lib/item'
#=> true

pry(main)> require './lib/vendor'
#=> true

pry(main)> require './lib/market'
#=> true

pry(main)> market = Market.new("South Pearl Street Farmers Market")    
#=> #<Market:0x00007fe134933e20...>

pry(main)> item1 = Item.new({name: 'Peach', price: "$0.75"})
#=> #<Item:0x007f9c56740d48...>

pry(main)> item2 = Item.new({name: 'Tomato', price: '$0.50'})
#=> #<Item:0x007f9c565c0ce8...>

pry(main)> item3 = Item.new({name: "Peach-Raspberry Nice Cream", price: "$5.30"})
#=> #<Item:0x007f9c562a5f18...>

pry(main)> item4 = Item.new({name: "Banana Nice Cream", price: "$4.25"})
#=> #<Item:0x007f9c56343038...>

pry(main)> vendor1 = Vendor.new("Rocky Mountain Fresh")
#=> #<Vendor:0x00007fe1348a1160...>

pry(main)> vendor1.stock(item1, 35)    

pry(main)> vendor1.stock(item2, 7)    

pry(main)> vendor2 = Vendor.new("Ba-Nom-a-Nom")    
#=> #<Vendor:0x00007fe1349bed40...>

pry(main)> vendor2.stock(item4, 50)    

pry(main)> vendor2.stock(item3, 25)    

pry(main)> vendor3 = Vendor.new("Palisade Peach Shack")    
#=> #<Vendor:0x00007fe134910650...>

pry(main)> vendor3.stock(item1, 65)  

pry(main)> vendor3.stock(item3, 10)    

pry(main)> market.add_vendor(vendor1)    

pry(main)> market.add_vendor(vendor2)    

pry(main)> market.add_vendor(vendor3)    

pry(main)> market.total_inventory
#=> {
  #   #<Item:0x007f9c56740d48...> => {
  #     quantity: 100,
  #     vendors: [#<Vendor:0x00007fe1348a1160...>, #<Vendor:0x00007fe134910650...>]
  #   },
  #   #<Item:0x007f9c565c0ce8...> => {
  #     quantity: 7,
  #     vendors: [#<Vendor:0x00007fe1348a1160...>]
  #   },
  #   #<Item:0x007f9c56343038...> => {
  #     quantity: 50,
  #     vendors: [#<Vendor:0x00007fe1349bed40...>]
  #   },
  #   #<Item:0x007f9c562a5f18...> => {
  #     quantity: 35,
  #     vendors: [#<Vendor:0x00007fe1349bed40...>, #<Vendor:0x00007fe134910650...>]
  #   },
  # }

pry(main).overstocked_items
#=> [#<Item:0x007f9c56740d48...>]

pry(main)> market.sorted_item_list
#=> ["Banana Nice Cream", "Peach", "Peach-Raspberry Nice Cream", "Tomato"]

Iteration 4 - Selling Items

Add a method to your Market class called sell that takes an item and a quantity as arguments. There are two possible outcomes of the sell method:

If the Market does not have enough of the item in stock to satisfy the given quantity, this method should return false.
If the Market's has enough of the item in stock to satisfy the given quantity, this method should return true. Additionally, this method should reduce the stock of the Vendors. It should look through the Vendors in the order they were added and sell the item from the first Vendor with that item in stock. If that Vendor does not have enough stock to satisfy the given quantity, the Vendor's entire stock of that item will be depleted, and the remaining quantity will be sold from the next vendor with that item in stock. It will follow this pattern until the entire quantity requested has been sold.

For example, suppose vendor1 has 35 peaches and vendor3 has 65 peaches, and vendor1 was added to the market first. If the method sell(<ItemXXX, @name = 'Peach'...>, 40) is called, the method should return true, vendor1's new stock of peaches should be 0, and vendor3's new stock of peaches should be 60.

Use TDD to update the Market class so that it responds to the following interaction pattern: