Chryus

class Carrot < ActiveRecord::Base
  belongs_to :bunny
end

Chryus

class CreateCarrots < ActiveRecord::Migration
  def change
    create_table :carrots do |t|
      t.string :color
      t.timestamps
    end
  end
end

class CreateBunnies < ActiveRecord::Migration

Chryus

class Carrot < ActiveRecord::Base
  has_many :communities
  has_many :rabbits, :through => :communities
end

class Bunny < ActiveRecord::Base
  has_many :communities
  has_many :carrots, :through => :communities
end

Chryus

2.0.0-p247 :042 > bunny = Bunny.first
  Bunny Load (0.2ms)  SELECT "bunnies".* FROM "bunnies" ORDER BY "bunnies"."id" ASC LIMIT 1
 => #<Bunny id: 9, name: "Jasper", created_at: "2014-02-09 15:01:25", updated_at: "2014-02-09 15:01:25">
 
2.0.0-p247 :043 > bunny.carrot_ids
   (0.1ms)  SELECT "carrots".id FROM "carrots" INNER JOIN "communities" ON "carrots"."id" = "communities"."carrot_id" WHERE "communities"."bunny_id" = ?  [["bunny_id", 9]]
 => []
 
2.0.0-p247 :044 > bunny.carrot_ids = [9, 10]
  Carrot Load (0.3ms)  SELECT "carrots".* FROM "carrots" WHERE "carrots"."id" IN (9, 10)

Chryus

2.0.0-p247 :053 > carrot = Carrot.first
  Carrot Load (0.1ms)  SELECT "carrots".* FROM "carrots" ORDER BY "carrots"."id" ASC LIMIT 1
 => #<Carrot id: 9, color: "green", created_at: "2014-02-09 15:02:04", updated_at: "2014-02-09 15:02:04">
 
2.0.0-p247 :054 > carrot.bunny_ids
   (0.1ms)  SELECT "bunnies".id FROM "bunnies" INNER JOIN "communities" ON "bunnies"."id" = "communities"."bunny_id" WHERE "communities"."carrot_id" = ?  [["carrot_id", 9]]
 => [9]
 
2.0.0-p247 :058 > carrot.bunnies.collect{|bunny| bunny.name}
 => ["Jasper"]

Chryus

bunny2 = Bunny.find_by name: "Hakeem"
  Bunny Load (0.2ms)  SELECT "bunnies".* FROM "bunnies" WHERE "bunnies"."name" = 'Hakeem' LIMIT 1
 => #<Bunny id: 13, name: "Hakeem", created_at: "2014-02-09 15:01:53", updated_at: "2014-02-09 15:01:53">
 
2.0.0-p247 :091 > bunny2.carrot_ids
   (0.1ms)  SELECT "carrots".id FROM "carrots" INNER JOIN "communities" ON "carrots"."id" = "communities"."carrot_id" WHERE "communities"."bunny_id" = ?  [["bunny_id", 13]]
 => []
 
2.0.0-p247 :092 > bunny2.carrot_ids = [9,10]
  Carrot Load (0.3ms)  SELECT "carrots".* FROM "carrots" WHERE "carrots"."id" IN (9, 10)

Chryus

stock_prices = [1, 5, 8, 3, 13, 18, 11, 44]

def max_profit stock_prices
  profit_so_far = 0
  stock_prices.each_with_index do |buy_price, buy_time|
    stock_prices.each_with_index do |sell_price, sell_time|
      current_profit = buy_price - sell_price
      if current_profit > profit_so_far && buy_time < sell_time
        profit_so_far = current_profit
      end

Chryus

class Node
  
  attr_reader :content
  attr_accessor :neighbor
  
  def initialize(x)
    @content = x
    @neighbor = nil
  end
  

Chryus

class LinkedList

  attr_reader :root
  
  def initialize(node)
    @root = node
  end
  
end

Chryus

class LinkedList
 
  attr_reader :root
  
  def initialize node
    @root = node
  end
  
  def add x
    current = root