sqlalchemy.orm.properties.ConcreteInheritedProperty

class documentation

class ConcreteInheritedProperty(DescriptorProperty):

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A 'do nothing' .MapperProperty that disables an attribute on a concrete subclass that is only present on the inherited mapper, not the concrete classes' mapper.

Cases where this occurs include:

When the superclass mapper is mapped against a "polymorphic union", which includes all attributes from all subclasses.
When a relationship() is configured on an inherited mapper, but not on the subclass mapper. Concrete mappers require that relationship() is configured explicitly on each subclass.

Method	`__init__`	Undocumented
Method	`_comparator_factory`	Undocumented
Instance Variable	`descriptor`	Undocumented

Inherited from DescriptorProperty:

Method	`instrument_class`	Hook called by the Mapper to the property to initiate instrumentation of the class attribute managed by this MapperProperty.
Class Variable	`_links_to_entity`	True if this MapperProperty refers to a mapped entity.
Class Variable	`doc`	Undocumented
Class Variable	`uses_objects`	Undocumented

Inherited from MapperProperty (via DescriptorProperty):

Method	`__repr__`	Undocumented
Method	`_memoized_attr_info`	Info dictionary associated with the object, allowing user-defined data to be associated with this `.InspectionAttr`.
Method	`cascade_iterator`	Iterate through instances related to the given instance for a particular 'cascade', starting with this MapperProperty.
Method	`create_row_processor`	Produce row processing functions and append to the given set of populators lists.
Method	`do_init`	Perform subclass-specific initialization post-mapper-creation steps.
Method	`init`	Called after all mappers are created to assemble relationships between mappers and perform other post-mapper-creation initialization steps.
Method	`merge`	Merge the attribute represented by this `MapperProperty` from source to destination object.
Method	`post_instrument_class`	Perform instrumentation adjustments that need to occur after init() has completed.
Method	`set_parent`	Set the parent mapper that references this MapperProperty.
Method	`setup`	Called by Query for the purposes of constructing a SQL statement.
Class Variable	`__slots__`	Undocumented
Class Variable	`_cache_key_traversal`	Undocumented
Class Variable	`cascade`	The set of 'cascade' attribute names.
Class Variable	`is_property`	Part of the InspectionAttr interface; states this object is a mapper property.
Instance Variable	`_configure_finished`	Undocumented
Instance Variable	`_configure_started`	Undocumented
Instance Variable	`parent`	Undocumented
Property	`class_attribute`	Return the class-bound descriptor corresponding to this `.MapperProperty`.

Inherited from HasCacheKey (via DescriptorProperty, MapperProperty):

Class Variable	`inherit_cache`	Indicate if this `.HasCacheKey` instance should make use of the cache key generation scheme used by its immediate superclass.
Class Method	`_generate_cache_attrs`	generate cache key dispatcher for a new class.
Class Method	`_generate_cache_key_for_object`	Undocumented
Method	`_gen_cache_key`	return an optional cache key.
Method	`_generate_cache_key`	return a cache key.
Class Variable	`_hierarchy_supports_caching`	private attribute which may be set to False to prevent the inherit_cache warning from being emitted for a hierarchy of subclasses.
Class Variable	`_is_has_cache_key`	Undocumented

Inherited from InspectionAttr (via DescriptorProperty, MapperProperty):

Class Variable	`_is_internal_proxy`	True if this object is an internal proxy object.
Class Variable	`is_aliased_class`	True if this object is an instance of `.AliasedClass`.
Class Variable	`is_attribute`	True if this object is a Python :term:`descriptor`.
Class Variable	`is_bundle`	True if this object is an instance of `.Bundle`.
Class Variable	`is_clause_element`	True if this object is an instance of `_expression.ClauseElement`.
Class Variable	`is_instance`	True if this object is an instance of `.InstanceState`.
Class Variable	`is_mapper`	True if this object is an instance of `_orm.Mapper`.
Class Variable	`is_selectable`	Return True if this object is an instance of `_expression.Selectable`.

Inherited from MemoizedSlots (via DescriptorProperty, MapperProperty):

Method	`__getattr__`	Undocumented
Method	`_fallback_getattr`	Undocumented

def __init__(self):

overrides sqlalchemy.orm.interfaces.MapperProperty.__init__

Undocumented

def _comparator_factory(self, mapper):

Undocumented

descriptor =

overrides sqlalchemy.orm.descriptor_props.DescriptorProperty.descriptor

Undocumented