chelseatroy

class Database
  def initialize
    @count = Hash.new(0)
    @db = Hash.new()
  end

  # CRUD COMMANDS

  def set(key, value)
    @db[key] = value

chelseatroy

class User < ApplicationRecord
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
  ...
  
  def active_for_authentication? 
    super && approved? 
  end 
  
  def inactive_message 

chelseatroy

require_relative "database"
require "test/unit"

class TestDatabase < Test::Unit::TestCase
  
  ...
    
    def test_commit_with_transaction
    db = Database.new

chelseatroy

...
  
  def test_rollback_with_transaction
    db = Database.new

    db.set "Bald", "Eagle"
    assert_equal(1, db.count("Eagle"))

    db.begin
    db.set "Golden", "Eagle"

chelseatroy

class Database
  def initialize
    @count_versions = [Hash.new(0)]
    @db_versions = [Hash.new()]
  end

  # CRUD COMMANDS

  def set(key, value)
    @db_versions[-1][key] = value

chelseatroy

class Database
  def initialize
    @count_versions = [Hash.new(0)]
    @db_versions = [Hash.new()]
  end

  # CRUD COMMANDS

  def set(key, value)
    @db_versions[-1][key] = value

chelseatroy

class Database
  def initialize
    @count_versions = [Hash.new(0)]
    @db_versions = [Hash.new()]
    @tier = 0
  end

  # CRUD COMMANDS

  def set(key, value)

chelseatroy

...

  def test_nested_transaction
    db = Database.new

    db.set "Pacific", "Baza"
    assert_equal(1, db.count("Baza"))

    db.begin
    db.set "Black", "Baza"

chelseatroy

...

  def test_transaction_with_deletion
    db = Database.new

    db.set "Homing", "Pigeon"
    db.set "Fantail", "Pigeon"

    assert_equal(2, db.count("Pigeon"))

chelseatroy

class Database
  def initialize
    @count_versions = [Hash.new(0)]
    @db_versions = [Hash.new()]
    @deletion_keys = [[]]
    @tier = 0
  end

  # CRUD COMMANDS