code: def add_user_role(self, user, role_name):
          
  
          # For SQL: user.roles is list of pointers to Role objects
          if isinstance(self.db_adapter, SQLDbAdapter):
              # user.roles is a list of Role IDs
              # Get or add role
              role = self.db_adapter.find_first_object(self.RoleClass, name=role_name)
              if not role:
                  role = self.RoleClass(name=role_name)
                  self.db_adapter.add_object(role)
              user.roles.append(role)
  
          # For others: user.roles is a list of role names
          else:
              # user.roles is a list of role names
              user.roles.append(role_name)
docs: Associate a role name with a user.