module Devise::Models::Authenticatable::ClassMethods

def find_or_initialize_with_errors(required_attributes, attributes, error=:invalid) #:nodoc:
  attributes = attributes.slice(*required_attributes)
  attributes.delete_if { |key, value| value.blank? }
  if attributes.size == required_attributes.size
    record = find_first_by_auth_conditions(attributes)
  end
  unless record
    record = new
    required_attributes.each do |key|
      value = attributes[key]
      record.send("#{key}=", value)
      record.errors.add(key, value.present? ? error : :blank)
    end
  end
  record
end