its a typo.  if you could place a ticket in trac (with milestone  
0.4xx) that would be helpful.

On Nov 8, 2007, at 12:31 PM, Andrew Stromnov wrote:

>
> 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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