metamaps--metamaps/app/models/user.rb

require 'open-uri'

class User < ActiveRecord::Base

  has_many :topics
  has_many :synapses
  has_many :maps
  has_many :mappings

  before_create :generate_code

  devise :database_authenticatable, :recoverable, :rememberable, :trackable, :registerable
  
  attr_accessible :name, :email, :image, :password, :password_confirmation, :code, :joinedwithcode, :remember_me

  serialize :settings, UserPreference
	
  validates :password, :presence => true,
                       :length => { :within => 8..40 },
                       :on => :create
  validates :password, :length => { :within => 8..40 },
                       :allow_blank => true,
                       :on => :update
  validates_confirmation_of :password

  validates_presence_of :name # done by devise
  validates_presence_of :email # done by devise
  validates_uniqueness_of :name # done by devise
  validates_uniqueness_of :email # done by devise

  if ActiveRecord::Base.connection.table_exists? 'users' 
    codes =  ActiveRecord::Base.connection.execute("SELECT code FROM users").map {|user| user["code"] }
  else 
    codes = []
  end
  validates :joinedwithcode, :presence => true, :inclusion => { :in => codes, :message => "%{value} is not valid" }, :on => :create
    
  # This method associates the attribute ":image" with a file attachment
  has_attached_file :image, :styles => {
   :square => ['84x84#', :png]
  },
  :default_url => "/assets/user.png"
    
  # Validate the attached image is image/jpg, image/png, etc
  validates_attachment_content_type :image, :content_type => /\Aimage\/.*\Z/

  def as_json(options={})
    { :id => self.id,
      :name => self.name,
      :image => self.image.url(:square)
    }
  end
  
  def generate_code
    #generate a random 8 letter/digit code that they can use to invite people
	  self.code = rand(36**8).to_s(36)

    self.generation = self.get_generation
  end

  def get_generation
    if self.joinedwithcode == self.code
      # if your joinedwithcode equals your code you must be GEN 0
      gen = 0
    elsif self.generation
      # if your generation has already been calculated then just return that value
      gen = self.generation
    else
      # if your generation hasn't been calculated, base it off the
      # generation of the person whose code you joined with + 1
      gen = User.find_by_code(self.joinedwithcode).get_generation + 1
    end
  end
  
  def settings
    # make sure we always return a UserPreference instance
    if read_attribute(:settings).nil?
      write_attribute :settings, UserPreference.new
      read_attribute :settings
    else
      read_attribute :settings
    end
  end
  
  def settings=(val)
    write_attribute :settings, val
  end
end