adopt-a-hydrant/app/models/user.rb

class User < ActiveRecord::Base
  include ActiveModel::ForbiddenAttributesProtection
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable,
  # :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable, :recoverable, :rememberable,
    :trackable, :validatable
  validates_formatting_of :email, :using => :email
  validates_formatting_of :sms_number, :using => :us_phone, :allow_blank => true
  validates_formatting_of :voice_number, :using => :us_phone, :allow_blank => true
  validates_formatting_of :zip, :using => :us_zip, :allow_blank => true
  validates_presence_of :name
  has_many :reminders_to, :class_name => "Reminder", :foreign_key => "to_user_id"
  has_many :reminders_from, :class_name => "Reminder", :foreign_key => "from_user_id"
  has_many :things
  before_validation :remove_non_digits_from_phone_numbers
  def remove_non_digits_from_phone_numbers
    self.sms_number = self.sms_number.to_s.gsub(/\D/, '').to_i if self.sms_number.present?
    self.voice_number = self.voice_number.to_s.gsub(/\D/, '').to_i if self.voice_number.present?
  end
end