objects.rb

class Drink
  attr_reader :name, :description, :ingredients
  def initialize(name, description)
    @name = name
    @description = description
    @ingredients = []
  end

  def add_ingredient(ingredient)
    @ingredients << ingredient

    ingredient.add_drink(self)
  end
end

class Ingredient
  attr_reader :name, :drinks
  def initialize(name)
    @name = name
    @drinks = []
  end

  def add_drink(drink)
    @drinks << drink
  end
end

long_island = Drink.new("Long Island Iced Tea", "Take a few of these for a fun night")
# ["vodka", "gin", "rum", "tequila", "triple-sec", "lemon juice", "coke"]

vodka = Ingredient.new("Vodka")
gin = Ingredient.new("Gin")
rum = Ingredient.new("Rum")
tequila = Ingredient.new("Tequila")
triple_sec = Ingredient.new("Triple Sec")
lemon_juice = Ingredient.new("Lemon Juice")
coke = Ingredient.new("Coke")

long_island.add_ingredient(vodka)
long_island.add_ingredient(gin)
long_island.add_ingredient(rum)
long_island.add_ingredient(tequila)
long_island.add_ingredient(triple_sec)
long_island.add_ingredient(lemon_juice)
long_island.add_ingredient(coke)

rum_and_coke = Drink.new("Rum and Coke", "Simple, and delish")

rum_and_coke.add_ingredient(rum)
rum_and_coke.add_ingredient(coke)

rum.drinks
require 'pry'
binding.pry