tap/app/models/user.rb

# == Schema Information
#
# Table name: users
#
#  id              :integer          not null, primary key
#  name            :string(255)
#  last_name       :string(255)
#  balance         :integer          default(0)
#  nickname        :string(255)
#  password_digest :string(255)
#  created_at      :datetime
#  updated_at      :datetime
#

class User < ActiveRecord::Base
  has_many :orders, -> { includes :products }

  validates :name, presence: true
  validates :last_name, presence: true
  validates :nickname, presence: true, uniqueness: true

  def full_name
    "#{name} #{last_name}"
  end

  def pay(amount)
    self.increment!(:balance, - amount)
  end

  has_secure_password
end