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| -rw-r--r-- | doc/build/mappers.rst | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/build/mappers.rst b/doc/build/mappers.rst index 7e320c26a..81d67f217 100644 --- a/doc/build/mappers.rst +++ b/doc/build/mappers.rst @@ -477,7 +477,9 @@ It also accepts a second argument ``selectable`` which replaces the automatic jo # custom selectable query.with_polymorphic([Engineer, Manager], employees.outerjoin(managers).outerjoin(engineers)) -:func:`~sqlalchemy.orm.query.Query.with_polymorphic` is also needed when you wish to add filter criterion that is specific to one or more subclasses, so that those columns are available to the WHERE clause: +:func:`~sqlalchemy.orm.query.Query.with_polymorphic` is also needed +when you wish to add filter criteria that are specific to one or more +subclasses; It makes the subclasses' columns available to the WHERE clause: .. sourcecode:: python+sql |