At
http://www.sqlalchemy.org/docs/04/sqlalchemy_orm.html#docstrings_sqlalchemy.orm_MapperExtension
:
"""
def create_instance(self, mapper, selectcontext, row, class_)
Receive a row when a new object instance is about to be created from
that row.
The method can choose to create the instance itself, or it can return
None to indicate normal object creation should take place.
""""
but in code no 'None' value accepted (mapper.py line 1414):
"""
# plugin point
if 'create_instance' in extension.methods:
instance = extension.create_instance(self, context,
row, self.class_)
if instance is EXT_CONTINUE:
instance =
attribute_manager.new_instance(self.class_)
else:
instance = attribute_manager.new_instance(self.class_)
instance._entity_name = self.entity_name
""""
if extension.create_instance() produces None, then last string should
raise AttributeError exception
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