class Devise::ParameterSanitizer

def unknown_action!(action)
  raise NotImplementedError, <<-MESSAGE.strip_heredoc
    "Devise doesn't know how to sanitize parameters for '#{action}'".
    If you want to define a new set of parameters to be sanitized use the
    `permit` method first:
      devise_parameter_sanitizer.permit(:#{action}, keys: [:param1, :param2, :param3])
  MESSAGE
end