code: def name(cls):
          
          if cls.__name_length__ is None:
              column_type = UnicodeText()
          else:
              column_type = Unicode(cls.__name_length__)
          if cls.__name_blank_allowed__:
              return Column(column_type, nullable=False, unique=True)
          else:
              return Column(column_type, CheckConstraint("name <> ''"), nullable=False, unique=True)
docs: The URL name of this object, unique across all instances of this model