before_action :require_administrator
before_action :require_valid_role
before_action :not_in_role, :only => [:grant]
before_action :in_role, :only => [:revoke]
def grant
before_action :require_administrator
before_action :require_valid_role
before_action :not_in_role, :only => [:grant]
before_action :in_role, :only => [:revoke]
def grant