sqlalchemy.orm.strategies.SubqueryLoader

class documentation

class SubqueryLoader(PostLoader):

Undocumented

Class	`_SubqCollections`	Given a `_query.Query` used to emit the "subquery load", provide a load interface that executes the query at the first moment a value is needed.
Method	`__init__`	Undocumented
Method	`_apply_joins`	Undocumented
Method	`_create_collection_loader`	Undocumented
Method	`_create_scalar_loader`	Undocumented
Method	`_generate_from_original_query`	Undocumented
Method	`_get_leftmost`	Undocumented
Method	`_prep_for_joins`	Undocumented
Method	`_setup_options`	Undocumented
Method	`_setup_outermost_orderby`	Undocumented
Method	`_setup_query_from_rowproc`	Undocumented
Method	`create_row_processor`	Establish row processing functions for a given QueryContext.
Method	`init_class_attribute`	Undocumented
Class Variable	`__slots__`	Undocumented
Instance Variable	`join_depth`	Undocumented

Inherited from PostLoader:

Method	`_check_recursive_postload`	Undocumented
Method	`_immediateload_create_row_processor`	Undocumented

Method	`__str__`	Undocumented
Method	`setup_query`	Establish column and other state for a given QueryContext.
Instance Variable	`is_class_level`	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.AbstractRelationshipLoader.__init__

Undocumented

def _apply_joins(self, q, to_join, left_alias, parent_alias, effective_entity):

Undocumented

def _create_collection_loader(self, context, result, collections, local_cols, populators):

Undocumented

def _create_scalar_loader(self, context, result, collections, local_cols, populators):

Undocumented

def _generate_from_original_query(self, orig_compile_state, orig_query, leftmost_mapper, leftmost_attr, leftmost_relationship, orig_entity):

Undocumented

def _get_leftmost(self, orig_query_entity_index, subq_path, current_compile_state, is_root):

Undocumented

def _prep_for_joins(self, left_alias, subq_path):

Undocumented

def _setup_options(self, context, q, subq_path, rewritten_path, orig_query, effective_entity, loadopt):

Undocumented

def _setup_outermost_orderby(self, q):

Undocumented

def _setup_query_from_rowproc(self, context, query_entity, path, entity, loadopt, adapter):

Undocumented

def create_row_processor(self, context, query_entity, path, loadopt, mapper, result, adapter, populators):

overrides sqlalchemy.orm.interfaces.LoaderStrategy.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.interfaces.LoaderStrategy.init_class_attribute

Undocumented

__slots__: tuple[str, ...] =

overrides sqlalchemy.orm.strategies.AbstractRelationshipLoader.__slots__

Undocumented

join_depth =

Undocumented