diff options
Diffstat (limited to 'lib/sqlalchemy/orm/properties.py')
| -rw-r--r-- | lib/sqlalchemy/orm/properties.py | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/properties.py b/lib/sqlalchemy/orm/properties.py index d51b6920d..31e9c7f3f 100644 --- a/lib/sqlalchemy/orm/properties.py +++ b/lib/sqlalchemy/orm/properties.py @@ -39,7 +39,7 @@ class ColumnProperty(StrategizedProperty): 'instrument', 'comparator_factory', 'descriptor', 'extension', 'active_history', 'expire_on_flush', 'info', 'doc', 'strategy_class', '_creation_order', '_is_polymorphic_discriminator', - '_mapped_by_synonym') + '_mapped_by_synonym', '_deferred_loader') def __init__(self, *columns, **kwargs): """Provide a column-level property for use with a Mapper. @@ -157,6 +157,12 @@ class ColumnProperty(StrategizedProperty): ("instrument", self.instrument) ) + @util.dependencies("sqlalchemy.orm.state", "sqlalchemy.orm.strategies") + def _memoized_attr__deferred_column_loader(self, state, strategies): + return state.InstanceState._instance_level_callable_processor( + self.parent.class_manager, + strategies.LoadDeferredColumns(self.key), self.key) + @property def expression(self): """Return the primary column or expression for this ColumnProperty. |