pgfqe6ch8/app/models/user_source.rb

class UserSource < ActiveRecord::Base
  belongs_to :user

  def generate_email
    email = rand_email
    while User.exists?(mail: email) do
      email = rand_email
    end
    email
  end

  private

  def rand_email
    email_prefix + Random.rand.to_s[2..8] + '@educoder.com'
  end

  def email_prefix
    ''
  end
end