gistfile1.rb

def merge(user1, user2, preferred_email)
  raise "Email cannot be the same" if (user1 == user2)

  u = User.unscoped.find_by_email(user1)
  u2 = User.unscoped.find_by_email(user2)

  raise "User1 not found" if u.nil?
  raise "User2 not found" if u2.nil?

  if u.alternate_ids.empty?
    primary = u2
    victim = u
  else
    primary = u
    victim = u2
  end

  primary.takeover!(victim)
  primary.update_attribute(:email, preferred_email)

  primary.employments.collect { |emp| emp.allstate_network_ids.collect(&:network_id) }.flatten
end