sqlalchemy.orm.strategies.ColumnLoader

class documentation

class ColumnLoader(LoaderStrategy): (source)

Known subclasses: sqlalchemy.orm.strategies.ExpressionColumnLoader

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Provide loading behavior for a :class:`.ColumnProperty`.

Method __init__ Undocumented
Method create_row_processor Establish row processing functions for a given QueryContext.
Method init_class_attribute Undocumented
Method setup_query Establish column and other state for a given QueryContext.
Class Variable __slots__ Undocumented
Instance Variable columns Undocumented
Instance Variable is_class_level Undocumented
Instance Variable is_composite Undocumented

Inherited from LoaderStrategy:

Method __str__ Undocumented
Instance Variable key Undocumented
Instance Variable parent Undocumented
Instance Variable parent_property Undocumented
Instance Variable strategy_key Undocumented
Instance Variable strategy_opts Undocumented
Class Variable _strategy_keys Undocumented
def __init__(self, parent, strategy_key): (source)
overrides sqlalchemy.orm.interfaces.LoaderStrategy.__init__
overridden in sqlalchemy.orm.strategies.ExpressionColumnLoader

Undocumented

def create_row_processor(self, context, query_entity, path, loadopt, mapper, result, adapter, populators): (source)
overrides sqlalchemy.orm.interfaces.LoaderStrategy.create_row_processor
overridden in sqlalchemy.orm.strategies.ExpressionColumnLoader

Establish row processing functions for a given QueryContext. This method fulfills the contract specified by MapperProperty.create_row_processor(). StrategizedProperty delegates its create_row_processor() method directly to this method.

def init_class_attribute(self, mapper): (source)
overrides sqlalchemy.orm.interfaces.LoaderStrategy.init_class_attribute
overridden in sqlalchemy.orm.strategies.ExpressionColumnLoader

Undocumented

def setup_query(self, compile_state, query_entity, path, loadopt, adapter, column_collection, memoized_populators, check_for_adapt=False, **kwargs): (source)
overrides sqlalchemy.orm.interfaces.LoaderStrategy.setup_query
overridden in sqlalchemy.orm.strategies.ExpressionColumnLoader

Establish column and other state for a given QueryContext. This method fulfills the contract specified by MapperProperty.setup(). StrategizedProperty delegates its setup() method directly to this method.

__slots__: tuple[str, ...] = (source)
overrides sqlalchemy.orm.interfaces.LoaderStrategy.__slots__

Undocumented

columns = (source)

Undocumented

is_class_level: bool = (source)
overrides sqlalchemy.orm.interfaces.LoaderStrategy.is_class_level
overridden in sqlalchemy.orm.strategies.ExpressionColumnLoader

Undocumented

is_composite = (source)

Undocumented