code: def _get_model_meta_options(self) -> List[MetaOption]:
          
          Define fields allowed in the Meta class on end-user models, and the
          behavior of each.
  
          Custom ModelMetaOptions classes should override this method to customize
          the options supported on class Meta of end-user models.
          """
          # we can't use current_app to determine if we're under test, because it
          # doesn't exist yet
          testing_options = ([] if os.getenv('FLASK_ENV', False) != TEST
                             else [_TestingMetaOption()])
  
          # when options require another option, its dependent must be listed.
          # options in this list are not order-dependent, except where noted.
          # all ColumnMetaOptions subclasses require PolymorphicMetaOption
          return testing_options + [
              AbstractMetaOption(),  # required; must be first
              LazyMappedMetaOption(),
              RelationshipsMetaOption(),  # requires lazy_mapped
              TableMetaOption(),
              MaterializedViewForMetaOption(),
  
              PolymorphicMetaOption(),  # must be first of all polymorphic options
              PolymorphicOnColumnMetaOption(),
              PolymorphicIdentityMetaOption(),
              PolymorphicBaseTablenameMetaOption(),
              PolymorphicJoinedPkColumnMetaOption(),  # requires _BaseTablename
  
              # must be after PolymorphicJoinedPkColumnMetaOption
              PrimaryKeyColumnMetaOption(),
              CreatedAtColumnMetaOption(),
              UpdatedAtColumnMetaOption(),
          ]
docs: Define fields allowed in the Meta class on end-user models, and the
          behavior of each.
  
          Custom ModelMetaOptions classes should override this method to customize
          the options supported on class Meta of end-user models.