sqlalchemy.orm.strategies.ExpressionColumnLoader

class documentation

class ExpressionColumnLoader(ColumnLoader):

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Undocumented

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.
Instance Variable ​_have​_default​_expression Undocumented
Instance Variable is​_class​_level Undocumented

Inherited from ColumnLoader:

Class Variable __slots__ Undocumented
Instance Variable columns Undocumented
Instance Variable is​_composite Undocumented

Inherited from LoaderStrategy (via ColumnLoader):

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
def __init__(self, parent, strategy_key):
overrides sqlalchemy.orm.strategies.ColumnLoader.__init__

Undocumented

def create_row_processor(self, context, query_entity, path, loadopt, mapper, result, adapter, populators):
overrides sqlalchemy.orm.strategies.ColumnLoader.create_row_processor

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):
overrides sqlalchemy.orm.strategies.ColumnLoader.init_class_attribute

Undocumented

def setup_query(self, compile_state, query_entity, path, loadopt, adapter, column_collection, memoized_populators, **kwargs):
overrides sqlalchemy.orm.strategies.ColumnLoader.setup_query

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.

_have_default_expression =

Undocumented

is_class_level: bool =
overrides sqlalchemy.orm.strategies.ColumnLoader.is_class_level

Undocumented